CGGVERITAS SERVICES SA Patent applications |
Patent application number | Title | Published |
20150142831 | COMPUTERIZED METHOD AND A COMPUTER PROGRAM RPODUCT FOR DETERMINING A RESULTING DATA SET REPRESENTATIVE OF A GEOLOGICAL REGION OF INTEREST - A computerized method where one provides first and second data sets, representative of the geological region of interest, each associating a signal to a bin of a four-dimensional input grid of the region of interest. Then one interpolates the first data set to determine both an interpolated first data set and interpolation operators. A residual between the second data set and the interpolated first data set is then determined. The residual is interpolated using said interpolation operators to determine an interpolated residual. | 05-21-2015 |
20140314491 | MAINTENANCE METHODS USING MOTORIZED DILFLOATS ON SEISMIC STREAMERS - Methods and systems allow for performing maintenance on a deployed portion of a seismic streamer. A method for raising and lowering a portion of a spread associated with a seismic streamer which is towed by a mother ship, the method including: configuring a device to be movable, wherein the device includes at least two buoyant structures connected by a platform, further wherein the platform includes a winch, a motor and controls associated with the winch and the motor; deploying the device from the mother ship overtop of the portion of the spread to be raised; lowering a line from the device via a winch to a position proximate the portion of the spread to be raised; connecting the line to the portion of the spread; and raising the line and the portion of the spread via the winch to a surface of a body of water. | 10-23-2014 |
20140288839 | METHOD AND APPARATUS FOR DEGHOSTING SEISMIC DATA - Apparatus, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes inputting data recorded by detectors that are towed by a vessel, the data being associated with waves travelling from the subsurface to the detectors; applying a migration procedure to the data to determine a first image of the subsurface; applying a mirror migration procedure to the data to determine a second image of the subsurface; joint deconvoluting the first image and the second image for deghosting a reflectivity of the subsurface; and generating a final image of the subsurface based on the deghosted reflectivity of the joint deconvoluting step. | 09-25-2014 |
20140251198 | FOLDABLE WING FOR STREAMER STEERING DEVICE AND METHOD - A streamer steering device to be attached to a streamer or a source of a marine seismic survey system. The streamer steering device includes a casing configured to be attached to the streamer or to the source; a wing assembly connected to the casing and having an active surface used to control depth and/or lateral position of the streamer; and an actuating mechanism located inside the casing and connected to the wing assembly, the actuating mechanism being configured to change a state of the wing assembly from an operational state to a folded state. The active surface has substantially the same area during the operational state and the folded state. | 09-11-2014 |
20140247693 | IMAGE-DOMAIN 4D-BINNING METHOD AND SYSTEM - A method for increasing similarity between a base seismic survey and a monitor seismic survey of a same surveyed subsurface during a 4-dimensional (4D) project. The method includes receiving first seismic data associated with the base seismic survey; receiving second seismic data associated with the monitor seismic survey, wherein the monitor seismic survey is performed later in time than the base seismic survey; migrating the first and second seismic data to an image-domain; and calculating, with a processor, a set of decimating weights based on the migrated first and second seismic data in the image-domain, to maximize a similarity between the first seismic data and the second seismic data. | 09-04-2014 |
20140211590 | PROCESS FOR SEPARATING DATA RECORDED DURING A CONTINUOUS DATA ACQUISITION SEISMIC SURVEY - Method for separating signals recorded by a seismic receiver and generated with at least two vibratory seismic sources driven with no listening time. The method includes receiving seismic data that includes data d recorded by the seismic receiver and data related to the first and second vibratory seismic sources; computing a source separation matrix based on the data related to the first and second vibratory seismic sources; calculating first and second earth impulse responses HA and HB corresponding to the two vibratory seismic sources, respectively, based on the data d recorded by the seismic receiver, the data related to the two vibratory seismic sources and the source separation matrix; and separating the signals recorded by the seismic receiver based on the first and second earth impulse responses HA and HB such that signals the two vibratory seismic sources are disentangled. | 07-31-2014 |
20140211589 | UNDERWATER NODE FOR SEISMIC SURVEYS AND METHOD - A method, system and a marine node for recording seismic waves underwater. The node includes a first module configured to house a seismic sensor; bottom and top plates attached to the first module; a second module removably attached to the first module and configured to slide between the bottom and top plates, the second module including a first battery and a data storage device; and a third module removably attached to the first module and configured to slide between the bottom and top plates, the third module including a second battery. | 07-31-2014 |
20140133271 | PROCESS FOR SEPARATING DATA RECORDED DURING A CONTINUOUS DATA ACQUISITION SEISMIC SURVEY - Method for separating signals recorded by a seismic receiver and generated with at least two vibratory seismic sources driven with no listening time. The method includes receiving seismic data that includes data d recorded by the seismic receiver and data related to the first and second vibratory seismic sources; computing a source separation matrix based on the data related to the first and second vibratory seismic sources; calculating first and second earth impulse responses HA and HB corresponding to the two vibratory seismic sources, respectively, based on the data d recorded by the seismic receiver, the data related to the two vibratory seismic sources and the source separation matrix; and separating the signals recorded by the seismic receiver based on the first and second earth impulse responses HA and HB such that signals the two vibratory seismic sources are disentangled. | 05-15-2014 |
20140114578 | SEISMIC SOURCE AND METHOD FOR INTERMODULATION MITIGATION - A method for calculating intermodulation noise generated with one or more land seismic sources. The method includes receiving seismic data generated by actuating the one or more land seismic source with a first sweep and a second sweep; calculating with a computing device a first earth response corresponding to the first sweep; calculating with the computing device a second earth response corresponding to the second sweep; and calculating the intermodulation noise based on the first and second earth responses. The second sweep is a time reverse sweep of the first sweep. | 04-24-2014 |
20140112098 | SEISMIC SOURCE AND METHOD FOR SINGLE SWEEP INTERMODULATION MITIGATION - A method for calculating intermodulation noise generated with one or more land seismic sources. The method includes receiving seismic data (g) generated by actuating the one or more land seismic source with a single sweep; selecting a number of detectors (a-f) that detect a subset (ga-gf) of the seismic data (g); estimating earth responses (ha | 04-24-2014 |
20140104986 | METHOD AND DEVICE FOR DETERMINING A DRIVING SIGNAL FOR VIBROSEIS MARINE SOURCES - Controller and method for determining a driving signal of a vibro-acoustic source element that is configured to generate acoustic waves in water. The method includes estimating at least one physical constraint of the vibro-acoustic source element; modeling a ghost function determined by a surface of the water; setting a target energy spectrum density to be emitted by the vibro-acoustic source element during the driving signal; and determining the driving signal in a controller based on at least one physical constraint, the ghost function, and the target energy spectrum density. | 04-17-2014 |
20140078861 | METHOD AND UNDERWATER NODE FOR SEISMIC SURVEY - A marine node for recording seismic waves underwater. The node includes a main body having a torus shape; a central body provided inside a space defined by the main body and connected to the main body through at least a link; a first thruster provided in the main body and configured to propel the main body along a central axis (Z) of the main body; and a seismic sensor configured to record the seismic waves underwater. | 03-20-2014 |
20140071791 | APPARATUS AND METHOD FOR RECONSTRUCTING COMPLEX SALT GEOMETRY USING DUAL-FLOOD RTM WITH PRISMATIC WAVES - A method, an apparatus and a computer-readable medium for processing seismic data are provided. The method includes selecting well-imaged areas of a sediment-to-salt interface, and performing (1) a dual-flood RTM with prismatic waves to identify new areas of the sediment-to-salt interface, and (2) one or more RTM to identify other new areas of the sediment-to-salt interface or of a salt-to-sediment interface. | 03-13-2014 |
20130343154 | SEISMIC DATA PROCESSING INCLUDING COMPENSATING FOR SOURCE AND RECEIVER GHOST EFFECTS IN REVERSE TIME MIGRATION - Methods and systems for compensating for source and receiver ghost effects in a reverse time migration (RTM) equation are described. Boundary conditions associated with the RTM acoustic wave equations for the source and recorded wavefields are modified. The resultant modified RTM acoustic wave equations are solved to generate ghost compensated modeled seismic images. In another aspect an imaging condition is also modified and the resultant RTM acoustic wave equations are solved to generate velocity and impedance perturbation images. | 12-26-2013 |
20130329521 | VARIABLE DEPTH STREAMER SRME - Methods and systems for variable wavelet correction are described. A variable depth dataset is deghosted before presentation to a multiples prediction step of multiples elimination model. In another aspect, the multiples prediction is reghosted before presentation to and adaptive subtraction step of the multiples elimination model. A source-side zero-phasing signature can be applied before deghosting and a predefined gain can be applied in the low and high frequency sides as part of deghosting and reghosting to compensate for the squaring effect produced by convolving wavelets. | 12-12-2013 |
20130308423 | ROBUST STACKED SLIP-SWEEP METHOD AND SYSTEM - A method for processing seismic data including contiguous-sweep records corresponding to rotated sweep segments includes attenuating harmonics and generating stacked traces, each stacked trace being a weighted sum of traces corresponding to same location in the subsurface, based on seismic data from different seismic receivers, following plural shots at plural locations. | 11-21-2013 |
20130308420 | METHOD AND APPARATUS FOR PRE-STACK DEGHOSTING OF SEISMIC DATA - A method for deghosting seismic data collected with a seismic system, the seismic data being related to a subsurface of a body of water. The method includes receiving the seismic data recorded by detectors distributed along a variable-depth profile; calculating migrated (d | 11-21-2013 |
20130301386 | METHOD, DEVICE AND PROCESSING ALGORITHM FOR MULTIPLE AND NOISE ELIMINATION FROM MARINE SEISMIC DATA - Computing device, computer instructions and method for simultaneously denoising and attenuating multiples in seismic data recorded with seismic receivers. The method includes receiving the seismic data, wherein the seismic data includes a pressure P component and a vertical Z component; separating the seismic data into up-going U wave-fields and down-going D wave-fields; calculating an up-down deconvolution R based on the up-going U and the down-going D wave-fields; generating a multiple model M based on the up-down deconvolution R; and adaptively subtracting the multiple model M from the pressure P component to obtain a corrected pressure P | 11-14-2013 |
20130297215 | METHOD AND APPARATUS FOR ELECTROMAGNETIC MONITORING OF UNDERGROUND FORMATIONS - An electromagnetic measurement system and related methods are provided. The system includes an electromagnetic source located at a predetermined depth and configured to generate electromagnetic waves in surrounding formations, and a grid of electromagnetic detectors located on a surface of the rock formation and configured to detect the electromagnetic waves generated by the electromagnetic source and reflected by an underground hydrocarbons reservoir. The system also includes a data processing unit configured to process first data and second data related to the electromagnetic waves detected by the grid of electromagnetic detectors, to extract changes of the underground hydrocarbon reservoir, the first data and the second data each being acquired for up to one week, at least two months apart from one another. The electromagnetic source and the grid of electromagnetic detectors are not moved or removed between when the first data was acquired and when the second data was acquired. | 11-07-2013 |
20130279293 | VECTORIZATION OF FAST FOURIER TRANSFORM FOR ELASTIC WAVE PROPOGATION FOR USE IN SEISMIC UNDERWATER EXPLORATION OF GEOGRAPHICAL AREAS OF INTEREST - Numerical simulations of elastic wave propagation algorithms are critical components for seismic imaging and inversion. Finite-difference schemes yield good efficiency but cannot ensure the accuracy of the high frequency component. Pseudo-spectral algorithms are accurate up to the Nyquist frequency, but its efficiency depends on the optimization of the fast Fourier transform (FFT) algorithm. The conventional FFT algorithms are optimized for signal processing, in which problems are generally one dimensional time series. For 3D wave propagation, FFT algorithms have the potential to be further optimized. Under current computer hardware architecture, a vectorization scheme for high dimensional FFTs is presented. Compared to conventional numerical scheme implementations, the systems and methods disclose herein has the best performance on the slowest or higher dimensions of data. For elastic wave propagation, vectorization improves the efficiency by more than a factor of two when compared to standard FFT algorithms. | 10-24-2013 |
20130279292 | SEISMIC DATA PROCESSING INCLUDING PREDICTING MULTIPLES USING A REVERSE TIME DEMIGRATION - Methods and systems for generating a stable reverse time demigration (RTDM) equation for predicting wave phenomena such as reflections, refractions and multiples are described. A coupling term is added to an RTDM equation and reflectivity associated with the coupling term is replaced with a pseudo-density function derived from a nonlinear equation. The resultant coupled and stabilized RTDM equation is then used to predict the desired wave phenomena based on the applied seismic image. | 10-24-2013 |
20130279290 | DEVICE AND METHOD FOR DEGHOSTING VARIABLE DEPTH STREAMER DATA - Computing device, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method may include receiving input seismic data recorded by seismic receivers that located at different depths (z | 10-24-2013 |
20130265850 | ACTIVE CLEANING DEVICE FOR SEISMIC STREAMERS AND RELATED METHODS - A cleaning device for cleaning a marine streamer towed underwater and related methods are provided. The cleaning device includes a housing configured to be attached to the streamer, a motor mounted inside the housing, a propeller configured be rotated by the motor and to drive the housing along and relative to the streamer in a towing direction, and a controller configured to control the motor and the propeller. | 10-10-2013 |
20130258809 | METHOD FOR TIME-LAPSE WAVE SEPARATION - A method for processing seismic data acquired using the same seismic survey setup over long periods of time includes acquiring sets of seismic data using the same seismic survey setup over multiple days, the sets being gathered as repeated seismic data. The method further includes estimating a time-variable wavelet corresponding to unwanted waves, and determining a propagation of the time-variable wavelet, which propagation is assumed to be constant in time, by solving an inverse problem using the repeated seismic data and the estimated time-variable wavelet. The method also includes extracting signal data by subtracting a convolution of the estimated time-variable wavelet and the propagation from the repeated seismic data. | 10-03-2013 |
20130258808 | METHOD AND DEVICE FOR DETECTING FAULTS IN A MARINE SOURCE ARRAY - A method for detecting faults of individual wave sources in a marine source array includes acquiring near-field data using sensors, the sensors being located near the individual wave sources. The method further includes generating an index for each of the individual wave sources based on (A) the near-field data and (B) information on the geometry of the marine source array that enables localizing the individual wave sources and respective sensors relative to one another. The method also includes comparing the index for each of the individual wave sources with a corresponding reference index for determining whether a fault has occurred. | 10-03-2013 |
20130258806 | MARINE ACQUISITION USING SUBAQUATIC FLOATING SEISMIC NODES - Methods and systems are presented for generating and performing a seismic data acquisition mission based on an a priori sea current model and a seismic data acquisition operation model and a shooting solution model based on the a priori sea current model. The individual models can be updated based on releasing sample buoys through the survey area both before and during mission execution. | 10-03-2013 |
20130251458 | METHOD AND DEVICE FOR MECHANIZED GEOPHONE DEPLOYMENT - A method and a mechanized system for deploying plural geophones underground for collecting seismic data. The mechanized system includes a vehicle configured to travel above ground and having a storage area that stores the plural geophones; a digging mechanism attached to the vehicle and configured to dig a trench when in contact with the ground; and a damping mechanism attached to the vehicle and configured to hold a geophone behind the digging mechanism relative to a traveling direction (X)) of the vehicle. | 09-26-2013 |
20130250725 | RETRIEVABLE VERTICAL GEOPHONE CABLE AND METHOD - A method and a retrievable vertical geophone cable for collecting seismic data underground. The retrievable vertical geophone cable includes an envelope having a first end at which a connector mechanism is provided to close the envelope; plural geophones distributed inside the envelope at predetermined positions; and a first expansion mechanism attached to a geophone of the plural geophones and configured to expand the envelope when actuated with a first fluid under pressure. | 09-26-2013 |
20130250724 | RETRIEVABLE VERTICAL HYDROPHONE CABLE AND METHOD - Method and retrievable vertical hydrophone cable for collecting seismic data underground. The retrievable vertical hydrophone cable includes an envelope having a first end at which a connector mechanism is provided to close the envelope; plural hydrophones distributed inside the envelope at predetermined positions; and a fluid provided inside the envelope and around the plural hydrophones. The envelope increases its volume when the fluid is pressurized through the connector mechanism. | 09-26-2013 |
20130250722 | SEISMIC METHODS AND SYSTEMS EMPLOYING FLANK ARRAYS IN WELL TUBING - Systems and method described herein provide for obtaining information which can be used to create a seismic image of a portion of the earth surrounding a well. A device for obtaining information for creating a seismic image proximate a well includes at least one set of acoustic transducers mounted to an exterior surface of a well tubing and configured to transmit at least one acoustic signal, at least one set of hydrophones mounted to the exterior surface of the well tubing and configured to receive at least one reflected acoustic signal; and a cable configured to convey information to and from the at least one set of acoustic transducers and the at least one set of hydrophones. | 09-26-2013 |
20130242699 | SEISMIC DATA PROCESSING AND APPARATUS - There is a method of seismic data processing that includes receiving seismic data that includes a set of seismic traces, each trace including a signal recorded by a sensor after having been propagated in a subsurface area; migrating the seismic data according to a first velocity model; picking from the time-migrated seismic data one or more events corresponding to one or more subsurface reflectors so as to obtain a set of facets locally approximating the event; kinematic demigrating the picked set of facets so as to obtain simplified seismic data that includes the set of facets and a set of attributes associated with the set of facets; migrating the set of facets based on a second velocity model; and updating the initial velocity model based on an alignment of migrated points within the set of facets. | 09-19-2013 |
20130242695 | METHOD AND APPARATUS FOR DEGHOSTING SEISMIC DATA - Apparatus, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes inputting data recorded by detectors that are towed by a vessel, the data being associated with waves travelling from the subsurface to the detectors; applying a migration procedure to the data to determine a first image of the subsurface; applying a mirror migration procedure to the data to determine a second image of the subsurface; joint deconvoluting the first image and the second image for deghosting a reflectivity of the subsurface; and generating a final image of the subsurface based on the deghosted reflectivity of the joint deconvoluting step. | 09-19-2013 |
20130242694 | STEERING SUBMERSIBLE FLOAT FOR SEISMIC SOURCES AND RELATED METHODS - Seismic sources including a steerable submersible float and related methods are provided. A seismic source includes a submersible float and a plurality of individual sources. The submersible float is configured to control at least one of a depth and a horizontal position of the submersible float by adjusting angles of one or more rotatable surfaces attached to the submersible float. The individual sources hang under the submersible float and are configured to operate at a depth larger than the depth of the submersible float. | 09-19-2013 |
20130239864 | DEFLECTOR FOR MARINE DATA ACQUISITION SYSTEM - Deflectors configured to be attached to cables towed behind a vessel for performing a marine survey are provided. A deflector has a wing body including a first part joined to a second part to form a swept-back-wing shape, the first part and the second part being substantially coplanar. A first straight line stretching along at least a portion of a front edge of the first part makes a first angle with a second straight line stretching along at least a portion of a front edge of the second part. A third straight line stretching along at least a portion of a trailing edge of the first part makes a second angle with a fourth straight line stretching along at least a portion of a trailing edge of the second part, the first angle and the second angle being non-zero angles. | 09-19-2013 |
20130238249 | SEISMIC REFLECTION FULL WAVEFORM INVERSION FOR REFLECTED SEISMIC DATA - A system and method are described herein for generating a velocity model of returned seismic signals for under-ocean floor environments. The system and method generate a series of source signals, receive a corresponding set of direct signals, reflected signals, and refracted signals, solve a velocity model equation using a full waveform inversion function with respect to the received set of direct signals, reflected signals and refracted signals to minimize a least square misfit function by relaxing a dependency on low frequency reflections in the full waveform inversion function. The system and method then generate the velocity model based on the solution to the velocity model equation, and display the velocity model. | 09-12-2013 |
20130215714 | METHOD, DEVICE AND NODE FOR SEABED SEISMIC ACQUISITION - The invention concerns a method for seabed seismic acquisition. According to the invention, a pair of geophones ( | 08-22-2013 |
20130215713 | CONNECTING DEVICE FOR WIDE TOW SURVEY - Marine seismic survey using an array ( | 08-22-2013 |
20130208564 | CATENARY SOURCE STEERING GEAR AND METHOD - A method and a catenary seismic source steering gear for towing seismic sources underwater. The catenary gear includes plural seismic sources configured to generate seismic waves underwater; a main rope configured to span between first and second vessels; and a connecting system configured to connect the plural seismic sources to the main rope. The main rope takes a substantially catenary shape when towed by the first and second vessels underwater. | 08-15-2013 |
20130201799 | SWEEP DESIGN FOR SEISMIC SOURCES - A system and method are described herein for generating a frequency sweep signal set for use in seismic data gathering. Low frequency sweep rate modifications are combined to compensate for vibrator limitations and vibrator far-field responses with high frequency sweep rate modifications to compensate for absorption, and then the frequency sweep signal set is generated based on the combination of high and low frequency sweep rate modifications. | 08-08-2013 |
20130194893 | METHOD AND APPARATUS FOR PROCESSING SEISMIC DATA - Methods and apparatuses for processing seismic data carrying information about a subsurface structure are provided. One method includes splitting the seismic data in groups, each group including subsets of seismic data for which a distance from a respective shot point to a receiver line in a patch of active detectors corresponding to the shot point is within a predetermined range for the group, and extracting signal data for each block Hankel matrix based on an SVD analysis thereof. Another method includes extracting signal data by subtracting from seismic data an estimated noise model obtained by rank reduction of a Hankel matrix followed by dip filtering, enhanced based on a least square matching filter with the seismic data. | 08-01-2013 |
20130188451 | BUOY BASED MARINE SEISMIC SURVEY SYSTEM AND METHOD - A seismic survey system for recording seismic data underwater. The system includes first plural buoys configured to descend to a first predetermined depth (H | 07-25-2013 |
20130188450 | ACTIVELY CONTROLLED BUOY BASED MARINE SEISMIC SURVEY SYSTEM AND METHOD - A buoy for recording seismic signals while underwater. The buoy includes a body; a buoyancy system configured to control a buoyancy of the body to descend to a predetermined depth (H | 07-25-2013 |
20130188449 | BUOY BASED MARINE SEISMIC SURVEY SYSTEM AND METHOD - A seismic survey system for recording seismic data underwater in the presence of underwater currents. The system includes first plural buoys configured to descend in water at a predetermined depth (H | 07-25-2013 |
20130188448 | MULTI-VESSEL SEISMIC ACQUISITION WITH UNDULATING NAVIGATION LINES - Method for determining a seismic survey configuration of a multi-vessel acquisition system. The method includes a step of receiving number that corresponds to vessels to be used in the multi-vessel acquisition system; a step of receiving a cross-line distance between first and last straight line paths corresponding to first and last vessels, respectively, of the multi-vessel acquisition system; a step of receiving an inline distance between the first and last vessels; a step of selecting shapes of undulating paths for the vessels of the multi-vessel acquisition system; a step of receiving a desired azimuth and/or offset distribution of receivers towed by one or more streamer vessels of the multi-vessel acquisition system relative to source vessels of the multi-vessel acquisition system; and a step of calculating amplitudes (A | 07-25-2013 |
20130182537 | DEVICE AND METHOD FOR ESTIMATING TIME-SHIFTS - Computing device and method for calculating time-shifts associated with travel-times of seismic waves emitted by a source and recorded by plural seismic detectors after reflection from a subsurface structure. The method includes receiving seismic data (d) that includes plural traces related to a subsurface, wherein the seismic data (d) is in a time-space domain; transforming with a processor the seismic data (d) from the time-space domain to a radon domain; picking linear events from the seismic data in the radon domain; calculating the time-shifts associated with the picked linear events; correcting the seismic data (d) based on the time-shifts to obtain new seismic data (d′); and computing an image of the subsurface based on the new seismic data (d′). The time-shifts are calculated per trace and per event. | 07-18-2013 |
20130182535 | SEISMIC DATA PROCESSING INCLUDING INTERNAL MULTIPLE MODELING WITHOUT SUBSURFACE INFORMATION - A system and method are disclosed for substantially eliminating the influence of internal multiples when seismic mapping under-water geographical areas of interest without a priori knowledge of subsurface information. The system and method iteratively locate multiple-generating horizons for predicting internal multiples and uses a lower-higher-lower relationship between the multiple generating horizons. The system and method provide an appropriate and cost-effective means for internal multiple attenuation without subsurface information. | 07-18-2013 |
20130182534 | DEVICE AND METHOD FOR REMOVAL OF MULTIPLES FROM SEISMIC DATA VINTAGES - A method, an apparatus and a computer readable medium for generating an image of a subsurface based on seismic data corresponding to at least two different times, for a same surveyed area are provided. A cost function, which is a sum over the seismic data vintages of a norm of differences between data and model predicted multiples, is minimized subject to minimizing residual multiples that are differences of corresponding multiples belonging to different vintages among the seismic data vintages. | 07-18-2013 |
20130176823 | SIMULTANEOUS JOINT ESTIMATION OF THE P-P AND P-S RESIDUAL STATICS - Methods and systems for estimating the residual static terms for multi-component land datasets are described. A one-pass estimation simultaneously using P-P pre-stack data and P-S pre-stack data for generating common source residual statics for the P-P data and the P-S data and separate receiver residual statics for the P-P data and the P-S data. A series of iterations are performed using either a linear or a non-linear simulation to converge on acceptable residual statics. | 07-11-2013 |
20130176820 | SURFACE-CONSISTENT AMPLITUDE AND DECONVOLUTION SIMULTANEOUS JOINED INVERSION - Methods and systems for a surface-consistent amplitude and deconvolution simultaneous joined inversion are described. A one-pass estimation using input trace data for generating gain and deconvolution operator based on a least squares iteration method. A series of iterations are performed simultaneously and independently estimating amplitude scalars and autocorrelation spectra with a common convergence criterion. The gain and deconvolution operator can further be used to correct the input trace data for pre-stack or stack imaging. | 07-11-2013 |
20130176819 | DEVICE AND METHOD FOR DE-BLENDING SIMULTANEOUS SHOOTING DATA - A device, medium and method for de-blending seismic data associated with a subsurface of the earth. The method includes a step of receiving seismic data “d” recorded with one or more land receivers, wherein the seismic data includes shot recordings generated by plural sources that are simultaneously actuated; a step of forming either a continuous receiver trace or trace segments from the received seismic data; a step of selecting plural overlapping spatial blocks that cover the surface shot locations; a step of assigning the shot recordings to the plural overlapping spatial blocks; a step of applying a mathematical technique to the recordings to determine de-blended data; and a step of generating an image of the subsurface based on the de-blended data. | 07-11-2013 |
20130176818 | VARIABLE DEPTH STREAMER SRME - Methods and systems for variable wavelet correction are described. A variable depth dataset is deghosted before presentation to a multiples prediction step of multiples elimination model. In another aspect, the multiples prediction is reghosted before presentation to and adaptive subtraction step of the multiples elimination model. A source-side zero-phasing signature can be applied before deghosting and a predefined gain can be applied in the low and high frequency sides as part of deghosting and reghosting to compensate for the squaring effect produced by convolving wavelets. | 07-11-2013 |
20130170316 | METHOD AND DEVICE FOR MARINE SEISMIC ACQUISITION - Methods and systems for improving azimuth distribution in a seismic acquisition system are described. A survey acquisition system includes a plurality of streamers towed by a plurality of streamer vessels, including a first streamer vessel and a second streamer vessel and a plurality of sources towed by a plurality of source vessels. The plurality of streamer vessels and plurality of source vessels are configured relative to one another such that the plurality of source vessels are positioned at one or more predetermined inline distances behind a portion of the first streamer vessel and are also positioned at one or more predetermined inline distances in front of a portion of the second streamer vessel. The plurality of streamer vessels and plurality of source vessels are also spaced apart from one another in a cross-line direction. | 07-04-2013 |
20130163386 | BURIED PRESSURIZED VOLUMETRIC SOURCE AND METHOD - A seismic source configured to generate seismic waves underground. The source includes a tank configured to be buried underground, the tank having a cavity; an actuation mechanism provided inside the cavity, wherein the actuation mechanism is configured to have at least one movable part that moves back and forth to generate a seismic wave having a desired frequency; and a first fluid provided inside the cavity and around the actuation mechanism and configured to transform the back and forth movement of the at least one movable part into a varying pressure that directly acts on walls of the tank. | 06-27-2013 |
20130163385 | HIGH-FREQUENCY CONTENT BOOST FOR VIBRATORY SEISMIC SOURCE AND METHOD - Computer software, controller and method for generating a desired pilot signal for driving a vibratory source. The method includes steps for selecting a pilot target amplitude spectrum for the vibratory source; determining an initial pilot signal that matches the pilot target amplitude spectrum; associating the initial pilot signal with first and second frequency bands, the second frequency band including a high-frequency end of a range of the vibratory source; band-passing a first part of the initial pilot signal associated with the first frequency band with a first band-pass configuration; band-passing a second part of the initial pilot signal associated with the second frequency band with a second band-pass configuration; level compressing the first and second parts of the initial pilot signal; recombining the first and second parts of the initial pilot signal to form a recombined pilot signal; and processing the recombined pilot signal to obtain the desired pilot signal. | 06-27-2013 |
20130163381 | METHOD AND SEISMIC SOURCES WITH HIGH PRODUCTIVITY - A method for seismic prospecting that includes a step of deploying plural vibratory sources on the ground; a step of receiving at each vibratory source a corresponding pilot signal for driving the vibratory source; a step of asynchronously actuating the vibratory sources to generate seismic waves into the ground; and a step of continuously recording seismic signals produced by the seismic waves. Pilot signals for the plural vibratory sources are obtained by spectrally shaping starting sequences into continuous pseudorandom sequences that are weakly correlated over a predetermined time interval. | 06-27-2013 |
20130163380 | LOW-FREQUENCY CONTENT BOOST FOR VIBRATORY SEISMIC SOURCE AND METHOD - Computer software, computer and method for generating with a computing device a desired pilot signal for driving a vibratory source to generate seismic waves. The method includes steps for compressing a pilot signal in a force domain and also compressing a mass displacement in a displacement domain. The resulting desired pilot signal boosts the low-frequency end of the vibratory source. | 06-27-2013 |
20130163379 | DEVICE AND METHOD FOR PROCESSING VARIABLE DEPTH STREAMER DATA - Computing device, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes receiving seismic data recorded by seismic receivers that are towed by a vessel, wherein the seismic data is recorded in a time-space domain; modeling the seismic data in a shot or common midpoint domain as a function of operators to derive a model; using the derived model to remove the receiver ghost from the seismic data to obtain deghosted seismic data; and generating a final image of the subsurface based on the deghosted seismic data. | 06-27-2013 |
20130163378 | DEVICE AND METHOD FOR DENOISING OCEAN BOTTOM DATA - Computing device, computer instructions and method for denoising marine seismic data recorded with first and second seismic sensors. The method includes receiving first seismic data recorded with the first sensor in a time-space domain; receiving second seismic data recorded with the second sensor in the time-space domain, wherein the first and second seismic data are recorded at the same locations underwater; calculating with a processor models of the first and second seismic data in a transform domain that is different from the time-space domain; performing a wavefield separation using the first and second datasets in the transform domain; determining a noise in the transform domain corresponding to the second seismic data based on the wavefield separation; reverse transforming the noise from the transform domain into the time-space domain; and denoising the second seismic data by subtracting the noise in the time-space domain from the second seismic data. | 06-27-2013 |
20130163377 | DEVICE AND METHOD FOR DENOISING OCEAN BOTTOM DATA - Computing device, computer instructions and method for denoising marine seismic data recorded with first and second seismic sensors. The method includes receiving first seismic data recorded with the first sensor in a time-space domain; receiving second seismic data recorded with the second sensor in the time-space domain, calculating with a processor models of the first and second seismic data in a transform domain that is different from the time-space domain; calculating in the transform domain an energy related to a down-going energy based on the models of the first and second seismic data; determining a noise in the transform domain corresponding to the second seismic data based on the calculated energy; reverse transforming the noise from the transform domain into the time-space domain; and denoising the second seismic data by subtracting the noise in the time-space domain from the second seismic data. | 06-27-2013 |
20130163376 | Device and Method for Deghosting Variable Depth Streamer Data - Computing device, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes receiving seismic data recorded by seismic receivers that are towed by a vessel, wherein the seismic data is recorded in a time-space domain and the seismic receivers are located at different depths (z | 06-27-2013 |
20130163374 | WATER-COUPLED UNDERWATER NODE FOR SEISMIC SURVEYS - A marine node for recording seismic waves underwater. The node includes a spherical body made of a material that has a density similar to a density of the water so that the body is buoyant neutral; a first sensor located in the body and configured to record three dimensional movements of the node; a second sensor located in the body and configured to record pressure waves propagating through the water; and one or more cables connected to the first and second sensors and configured to exit the body to be connected to an external device. The body is coupled to the water. | 06-27-2013 |
20130158878 | DEVICE AND METHOD FOR LOCATING MICROSEISMIC EVENTS USING ARRAY OF RECEIVERS - Device and method for locating a microseismic event taking place in a subsurface of the earth. The method includes receiving recorded seismic data S(t, Rc) acquired by a plurality of receivers as a function of time t and a position Rc; receiving a reference signal model SiMo(t, Rc) that corresponds to seismic data recorded by the plurality of receivers if an explosion occurs at an injection point in the subsurface; time correlating the recorded seismic data S(t, Rc) with the signal model SiMo(t, Rc) to determine correlated seismic data DMSS; calculating a detection curve for each of plural cells in a given volume in the subsurface of the earth based on the correlated seismic data DMSS; and determining a seismic location in the volume of the microseismic event based on a largest value of maximums of the detection curves calculated for various points of the given volume in the subsurface. | 06-20-2013 |
20130155811 | WAVE-FIELDS SEPARATION FOR SEISMIC RECORDERS DISTRIBUTED AT NON-FLAT RECORDING SURFACES - Apparatus, computer instructions and method for separating up-going and down-going wave fields (U, D) from seismic data recorded within or beneath a body of water, or in general below the surface of the earth. The method includes a step of receiving seismic data (P | 06-20-2013 |
20130155810 | METHOD AND DEVICE FOR SEPARATING SEISMIC SIGNALS FROM SEISMIC SOURCES - System and method for actuating first and second marine acoustic sources in a firing sequence, the firing sequence including at least a first actuation of the first source followed by a first actuation of the second source followed by a second actuation of the first source and a second actuation of the second source. The method includes towing the first source at a depth in water substantially equal to a depth of the second source; establishing a series of reference time instants; actuating the first source with a variable first time delay relative to the series of reference time instants; and actuating the second source with a variable second time delay relative to the series of reference time instants such that time intervals between consecutive activations of the first and second sources are also variable. | 06-20-2013 |
20130155806 | METHOD AND SYSTEM FOR MARINE SEISMIC SURVEY - A buoy is configured to record seismic signals while underwater. The buoy includes a body; a buoyancy system configured to control a buoyancy of the body to descend multiple times to a predetermined depth (H) and then resurface with a controlled speed; and a seismic sensor located in the body and configured to record the seismic signals. The seismic sensor is instructed to record the seismic signals as the buoy travels up and down between the water surface and the predetermined depth. | 06-20-2013 |
20130155805 | CONTROLLER AND METHOD FOR STEERING SOURCES - A marine acoustic source system and method for steering a seismic source array in a body of water during a seismic survey. The method includes measuring an actual position of the seismic source array; calculating a virtual position of the seismic source array, wherein the virtual position corresponds to a position of the seismic source array when towed with no adjustment from a source steering device; retrieving a pre-plot path that includes desired positions of the seismic source array for the seismic survey; and steering the vessel based on the virtual position so that the virtual position lies on the pre-plot path. | 06-20-2013 |
20130144535 | METHOD FOR DETERMINING TIME CORRECTION FOR A DETECTOR PLACED ON THE SEABED - The invention relates to a method for determining, for a detector placed on the surface of the seabed, the vertical propagation time and the velocity of propagation in the water of a wave emitted from an emission point. The method includes: emitting a wave from the emission point; recording the wave received by the detector; determining the vertical propagation time by, where t | 06-06-2013 |
20130139742 | PARAVANE INCREASED LIFT, TOWING SYSTEM AND METHOD - A method and a marine towing system for towing streamers or sources. The towing system includes a connecting line; a first paravane connected to the connecting line, wherein the connecting line is configured to connect the first paravane to a vessel; a spur line connected to the first paravane and configured to provide a tension to maintain streamers apart from each other; and a second paravane connected to the connecting line, between the first paravane and the vessel. The second paravane is configured to increase an angle (α | 06-06-2013 |
20130131991 | DEVICE AND METHOD FOR COMPUTING DEPTH VELOCITY VARIATIONS - Method, computer device and software for calculating a corrected temporal variation (dt | 05-23-2013 |
20130131990 | DEVICE AND METHOD FOR COMPUTING DEPTH VELOCITY VARIATIONS - Method, computer device and software for calculating a corrected temporal variation (dt | 05-23-2013 |
20130128695 | DEVICE AND METHOD FOR DEGHOSTING P-WAVES - Computing device and method for determining primary and ghost components from recorded P-waves. The method includes receiving seismic data (R, V) with regard to the P-waves, wherein the seismic data includes vertical and radial components recorded with a buried two-component receiver; calculating with a processor a primary component (P) and a ghost component (G) from the vertical and radial components; and computing an image of a subsurface based on the primary and ghost components (P, G). The P-waves form a plane wave. | 05-23-2013 |
20130121114 | Seismic Wave Emitting Device for Marine Seismic Acquisition and Method for Implementation Thereof - The invention concerns a device for emitting seismic waves designed to operate by being towed by a vessel. The device of the invention comprises a support of elongated shape; at least one seismic source connected to the support; means to tow the support whilst holding it in a substantially vertical position. | 05-16-2013 |
20130121110 | DEVICE AND METHOD FOR DE-BLENDING SIMULTANEOUS SHOOTING DATA WITH APEX SHIFTED RADON TRANSFORM - A device, medium and method for de-blending seismic data associated with a subsurface of the earth. The method includes receiving blended seismic data, wherein the blended seismic data includes traces having energies from two or more different shots that partially overlap; applying an apex-shifted radon transform (ASRT) to the blended seismic data to transform it from a first domain to a second domain; applying a mute processing for removing all shots except a first shot in the second domain; applying a reverse ASRT to the given shot to obtain the first shot in the first domain; and generating an image of the subsurface based on the first shot in the first domain. The procedure may be iteratively repeated to separate all shots. | 05-16-2013 |
20130121107 | DEVICE AND METHOD FOR DETERMINING SEISMIC OFFSET IN MARINE ACQUISITION - Computing device and method for generating an image of a subsurface. The method calculates an offset shift of measured offsets between a seismic source and plural receivers of a streamer. The method includes receiving seismic data recorded underwater by the plural receivers; selecting two pairs of traces from the plural traces and for each pair, calculating a quantity Y that depends on measured offsets of receivers for which the traces were selected, and a quantity X that depends on travel-times and the measured offsets of the receivers for which the traces were selected; calculating a linear relation Y=aX+b, where “a” is a constant and “b” is related to the offset shift; estimating the offset shift from “b”; correcting the measured offsets of the receivers based on the offset shift; and calculating the image of the subsurface based on the corrected offsets. | 05-16-2013 |
20130114373 | METHOD AND DEVICE FOR MARINE SEISMIC ACQUISITION - Method and system for improving offset/azimuth distribution. The system includes plural streamers towed by a streamer vessel; a central source towed by the streamer vessel; first and second front sources located in front of the plural streamers along a traveling direction of the streamer vessel; and first and second large offset front sources located in front of the first and second front sources along the traveling direction. The offset distance between the first and second large offset front sources, along a cross-line direction, is larger than an offset distance between the first and second front sources. | 05-09-2013 |
20130112495 | Marine Seismic Source - The invention concerns a device for emitting seismic waves designed to operate by being towed by a vessel, characterized in that it comprises means capable of discharging compressed air under high pressure into water, to generate a bubble (44) of a general annular shape. | 05-09-2013 |
20130100778 | SOURCE FOR MARINE SEISMIC ACQUISITION AND METHOD - Method, source and seismic vibro-acoustic source element configured to generate acoustic waves under water. The seismic vibro-acoustic source element includes an enclosure having first and second openings; first and second pistons configured to close the first and second openings; an actuator system provided inside the enclosure and configured to actuate the first and second pistons to generate a wave having first frequency; and a pressure mechanism attached to the enclosure and configured to control a pressure of a fluid inside the enclosure such that a pressure of the fluid is substantially equal to an ambient pressure of the enclosure. | 04-25-2013 |
20130100777 | SOURCE FOR MARINE SEISMIC ACQUISITION AND METHOD - Method, source and seismic vibro-acoustic source element configured to generate acoustic waves under water. The seismic vibro-acoustic source element includes an enclosure having first and second openings; first and second pistons configured to close the first and second openings; an actuator system provided inside the enclosure and configured to actuate the first and second pistons to generate a wave having first frequency; and a pressure mechanism attached to the enclosure and configured to control a pressure of a fluid inside the enclosure such that a pressure of the fluid is substantially equal to an ambient pressure of the enclosure. | 04-25-2013 |
20130100766 | METHOD AND DEVICE FOR DETERMINING A DRIVING SIGNAL FOR VIBROSEIS MARINE SOURCES - Controller and method for determining a driving signal of a vibro-acoustic source element that is configured to generate acoustic waves in water. The method includes estimating at least one physical constraint of the vibro-acoustic source element; modeling a ghost function determined by a surface of the water; setting a target energy spectrum density to be emitted by the vibro-acoustic source element during the driving signal; and determining the driving signal in a controller based on at least one physical constraint, the ghost function, and the target energy spectrum density. | 04-25-2013 |
20130100765 | ACQUISITION SCHEME FOR VIBROSEIS MARINE SOURCES - Control mechanisms, computer software and methods for driving vibrational source arrays underwater. An incoherent acquisition scheme drives individual source elements simultaneously and incoherently while a coherent acquisition scheme drives high-frequency individual source elements simultaneously and incoherently and low-frequency individual source elements simultaneously and coherently. Thus, denser coverage and an increased energy input is achieved for the source arrays. | 04-25-2013 |
20130100764 | ACQUISITION SCHEME FOR VIBROSEIS MARINE SOURCES - Control mechanisms, computer software and methods for driving vibrational source arrays underwater. An incoherent acquisition scheme drives individual source elements simultaneously and incoherently while a coherent acquisition scheme drives high-frequency individual source elements simultaneously and incoherently and low-frequency individual source elements simultaneously and coherently. Thus, denser coverage and an increased energy input is achieved for the source arrays. | 04-25-2013 |
20130098704 | SEISMIC SOURCE WITH POSITIVE REFLECTION PLATE AND METHOD - A marine source sub-array and method for generating a pressure wave in a body of water. The marine source sub-array includes a float configured to float in the body of water; base plates connected to the float through cables; plural individual source elements connected to the base plates and configured to generate pressure waves underwater; and a coverage plate located between the plural individual source elements and the float. The coverage plate has a surface area larger than a surface area of the float. | 04-25-2013 |
20130088940 | DEVICE AND METHOD FOR SOURCE MECHANISM IDENTIFICATION - Computing device, software and method for identifying a source mechanism associated with a microseismic event taking place in a subsurface of the earth. The method includes receiving traces associated with a plurality of receivers located in a grid above the subsurface; dividing the grid in a set of sub-blocks, determining, for each sub-block, a corresponding summation element based on traces associated with the corresponding sub-block; identifying a predetermined number of patterns that are associated with plural source mechanisms; multiplying each summation element by a polarization coefficient according to a corresponding pattern; calculating for each pattern, a semblance function based on summation elements of the sub-blocks; and identifying the source mechanism of the microseismic event based on the semblance function. | 04-11-2013 |
20130083624 | AUTONOMOUS UNDERWATER VEHICLE FOR MARINE SEISMIC SURVEYS - An autonomous underwater vehicle (AUV) for recording seismic signals during a marine seismic survey. The AUV includes a body having a flush shape; an intake water element located on the body and configured to take in water; at least one propulsion nozzle located on the body and configured to eject the water from the intake water element for actuating the AUV; at least one guidance nozzle located on the body and configured to eject water to change a traveling direction of the AUV; and a seismic payload located on the body of the AUV and configured to record seismic signals. | 04-04-2013 |
20130083623 | DEPLOYMENT AND RECOVERY OF AUTONOMOUS UNDERWATER VEHICLES FOR SEISMIC SURVEY - A system and method for performing a marine seismic survey of a subsurface. The method includes deploying under water, from a deploying vessel, an autonomous underwater vehicle (AUV); recording with seismic sensors located on the AUV seismic waves generated by an acoustic source array; instructing the AUV to surface at a certain depth relative to the water surface; recovering the AUV by bringing the AUV on a recovery vessel; and transferring recorded seismic data to the recovery vessel. | 04-04-2013 |
20130083622 | UNDERWATER NODE FOR SEISMIC SURVEYS - A method, system and a marine node for recording seismic waves underwater. The node includes a body made of a compressible material that has a density similar to a density of the water; a first sensor located in the body and configured to record pressure waves; and a second sensor located in the body and configured to record three dimensional movements. The body is coupled to the water for passing the seismic waves to the first and second sensors. | 04-04-2013 |
20130081564 | DEPLOYMENT AND RECOVERY VESSEL FOR AUTONOMOUS UNDERWATER VEHICLE FOR SEISMIC SURVEY - Method and vessel for performing marine acoustic survey of a subsurface. The vessel includes a launching module configured to deploy an autonomous underwater vehicle (AUV) underwater; a recovery module configured to recover the AUV; a homing device mounted on the recovery module and configured to guide the AUV to the recovery module; and a management module connecting the launching module to the recovery module and configured to transport the AUV. | 04-04-2013 |
20130077438 | METHODS AND SYSTEMS FOR ATTENUATING NOISE GENERATED AT FIXED LOCATIONS - Systems and methods according to these exemplary embodiments provide for attenuating noise which interferes with recordings of a seismic source. A method includes: generating a reference trace for a noise source; generating a primary trace for the seismic source; generating a first estimated convolutional operator between the reference trace and the primary trace; convolving the operator with the reference trace for a time frame to generate an estimated noise for the time frame; and subtracting the estimated noise from the primary trace to generate an output signal. | 03-28-2013 |
20130077436 | DEVICE AND METHOD TO DETERMINE SHAPE OF STREAMER - A method for determining a shape of a streamer to be towed under water for collecting seismic data. The method includes receiving a velocity model for the subsurface; selecting a first profile for a streamer to be used to survey the subsurface; calculating ghosts and/or residual ghosts and/or residual ghost spectra for a plurality of reflectors of the subsurface; and determining that the first profile is appropriate for surveying the subsurface when at least one criterion, related to the ghosts, residual ghosts and/or residual ghost spectra is met. | 03-28-2013 |
20130070559 | STEERABLE SOURCE ARRAY AND METHOD - Method and marine acoustic source array for generating an acoustic wave in a body of water. The marine acoustic source array includes first and second external source sub-arrays, each sub-array including one or more individual source elements; a first actuator device connected to the first external source sub-array; and a second actuator device connected to the second external source sub-array. The first actuator device has a corresponding cable configured to connect to a first lead-in, and the second actuator device has a corresponding cable configured to connect to a second lead-in such that a position of the source array as a whole is controllable along a line substantially perpendicular to a path of the source array. | 03-21-2013 |
20130070557 | STEERABLE SOURCE SYSTEMS AND METHOD - A marine acoustic source system for generating an acoustic wave in a body of water. The marine acoustic source system includes a first marine acoustic source array having first and second external source sub-arrays, each sub-array including one or more individual source elements; a first actuator device connected to the first external source sub-array; and a first rope connecting the first actuator device to a first lead-in that is configured to connect to a head of a streamer. The first actuator device is configured to control a length of the first rope in order to control a position of the first source array relative to the streamer. | 03-21-2013 |
20130041589 | PASSIVE MONITORING METHOD FOR SEISMIC EVENTS - The invention concerns a passive monitoring method to detect the presence of and characterize a micro-seismic event ( | 02-14-2013 |
20130023131 | CONNECTING PART BETWEEN LEAD-IN AND MARINE STREAMER AND METHOD - Seismic data acquisition system, method, and connecting part configured to connect a lead-in to a streamer. The connecting part includes a single body extending along a longitudinal axis (X) between the lead-in and the streamer; the single body has a first end configured to connect to the lead-in through a first connection device and the body also has a second end configured to connect to the streamer through a second connection device; at least a link connecting the first end to the second end and configured to receive a tension that appears in the single body; a cable extending through the single body and configured to provide data communications; and plural modules provided on the single body. The single body is configured to wound-up on a spool. | 01-24-2013 |
20130014685 | CLAMP-ON FAIRING AND METHOD - Method and fairing to be attached to a cable of a seismic survey system for reducing drag and/or noise. The fairing includes a body having a hydrodynamic shape; a tail portion connected to the body; and a head portion connected to the body, opposite to the tail portion, and configured to be removably clamped-on to the cable. The head portion, the body and the tail portion extend in this order along a traveling direction. | 01-17-2013 |
20120307593 | NON-LINEAR TOMOGRAPHY METHOD FOR MAIN AXIS OF SYMMETRY OF ANISOTROPIC VELOCITY MODEL AND APPARATUS - Device and method for estimating an event-related main anisotropy axis for a volume in a subsurface. The method includes selecting a velocity migration model for the given volume of the subsurface; receiving seismic data for the given volume; migrating the seismic data based on the velocity migration model; picking locally coherent events from the migrated data; and performing a tomographic process based on invariants to calculate the event-related main anisotropy axis. | 12-06-2012 |
20120300591 | METHOD AND FOLDABLE SUPPORT ASSEMBLY - Method and support assembly configured to change from a stowing position to an operational position. The support assembly includes a head module; an actuator attached to the head module; a tail module; plural modules provided between the head module and the tail module to form a first branch and a second branch, each branch being connected between the head module and the tail module; and a cable system provided through the means for guiding of the plural modules and connected to the actuator for being wind up and unwind to change a distribution of the modules from an operational position to a stowed position. | 11-29-2012 |
20120300582 | SYSTEM FOR DOPPLER POSITIONING OF SEISMIC SENSORS AND METHOD - Method and system for determining positions of underwater sensors. The method includes sending a Doppler variant signal from a moving source; recording the signal with the at least one seismic sensor; evaluating a frequency drift of the recorded signal; and determining a position of the at least one seismic sensor based on the evaluated frequency drift and a source movement relative to the at least one sensor. | 11-29-2012 |
20120300581 | CATENARY FRONT-END GEAR AND METHOD - Method and catenary front-end gear for towing streamers under water. The catenary front-end gear includes a main cable configured to be attached to a vessel and a device; a connecting system configured to connect streamers to the main cable; and plural streamers. The main cable takes a catenary shape when towed by the first vessel underwater. | 11-29-2012 |
20120287752 | COMPACT BROADBAND SOURCE AND METHOD - Method and marine acoustic source array for generating an acoustic wave in a body of water. The marine acoustic source array includes a first depth sub-array set of first acoustic source points configured to be provided at a first depth (z | 11-15-2012 |
20120275275 | ANTI-ATTACHMENT DEVICE AND METHOD - Method and an anti-attachment device configured to be provided on a streamer. The anti-attachment device includes a body configured to be provided around the streamer and a first end is configured to be rotatably attached to the streamer. | 11-01-2012 |
20120275268 | DEVICE AND METHOD FOR EXTRAPOLATING SPECULAR ENERGY OF REVERSE TIME MIGRATION THREE DIMENSIONAL ANGLE GATHERS - Computer instructions, computing device and method for processing seismic data under-sampled in an angle domain, the seismic data corresponding to a reverse time migration, three-dimensional, angle domain common image gather (ADCIG). The method includes receiving the seismic data; calculating, based on the seismic data, shot and receiver wave-fields with an RTM wave propagation engine; applying a wave-fields decomposition algorithm to obtain a propagation direction for the shot and receiver wave-fields; forming the ADCIG by applying an image condition to the shot and receiver wave-fields; determining that specular energies of the ADCIG are under-sampled around a reflection angle; during the step of forming the ADCIG, extrapolating the specular energies to a neighborhood of the reflection angle; and generating an image of a subsurface that is being surveyed based on the extrapolated specular energies. | 11-01-2012 |
20120263015 | DEVICE AND METHOD FOR CALCULATING 3D REVERSE TIME MIGRATION IN TILTED ORTHORHOMBIC MEDIA - A computing device, computing medium and method for generating an image of a tilted orthorhombic medium. The method includes receiving seismic data related to the tilted orthorhombic medium; calculating a wave propagation with a processing device by applying a second-order equation for reverse time migration to the seismic data to generate a tilted orthorhombic wave propagation; and generating the image of the tilted orthorhombic medium based on the tilted orthorhombic wave propagation. | 10-18-2012 |
20120250458 | ANTI-BARNACLE NET AND METHOD - Method and an array of streamers that prevent/slow down marine animals to attach to the streamers. The array includes at least one streamer including plural sections; and a net provided over at least one section of the at least one streamer. | 10-04-2012 |
20120224454 | METHOD AND DEVICE TO ACQUIRE MARINE SEISMIC DATA - The invention concerns a method to acquire seismic waves by means of a streamer towed by a vessel and comprising a plurality of seismic receivers. The streamer comprises a head portion that is slanted relative to the water surface and a tail portion having at least one section with a different slant. | 09-06-2012 |
20120218859 | Method and Device for Processing Seismic Data - Apparatus, computer instructions and method for processing seismic data related to a subsurface of a body of water. The method includes inputting data indicative of recordings made by detectors provided on a depth-changing profile in response to an acoustic wave reflected from the subsurface; applying a matched mirror migration procedure to the data, where (i) actual positions of the detectors on the depth-changing profile and corresponding recordings, and (ii) fictitious mirror positions of the actual detectors on the depth-changing profile and corresponding recordings with a changed sign are added in the matched mirror migration; and generating a final image of the subsurface based on the matched mirror migration procedure. | 08-30-2012 |
20120218858 | METHOD AND DEVICE TO ACQUIRE SEISMIC DATA - Streamer and method for deploying the streamer for seismic data acquisition related to a subsurface of a body of water. The method includes a step of releasing into the body of water, from a vessel, a body having a predetermined length together with plural detectors provided along the body; a step of towing the body and the plural detectors such that the plural detectors are submerged; and a step of configuring plural birds provided along the body, to float at a predetermined depth from a surface of the water such that a first portion of the body has a curved profile while being towed underwater. | 08-30-2012 |
20120215501 | PRESERVED-TRAVELTIME SMOOTHING METHOD AND DEVICE - Device and method for smoothing an original velocity model of a given subsurface such that a travel-time through the given subsurface is preserved. The method includes receiving the original velocity model, wherein the original velocity model has a set of model parameters that determine a given parameterization and the original velocity model has velocity discontinuities at various depths; selecting a sub-set of model parameters of the given parameterization; converting the selected sub-set of model parameters to composite parameters; smoothing with a processor the composite parameters by applying a convolutional filter (g) such that velocity moments are preserved at the velocity discontinuities; and generating a smooth velocity model by converting the smoothed composite parameters into a smoothed sub-set of model parameters. | 08-23-2012 |
20120215453 | DEVICE AND METHOD FOR MULTI-DIMENSIONAL COHERENCY DRIVEN DENOISING DATA - Computing device, computer instructions and method for denoising seismic data recorded with seismic receivers. The method includes receiving the seismic data recorded with the seismic receivers, wherein the seismic data is recorded in a time-space domain; applying with a computing device a high resolution transform to the seismic data in the time-space domain to obtain transformed seismic data in a different domain than the time-space domain, such that the method is amplitude preserving; determining regions of noise and regions of true signal in the transformed seismic data; scaling down the regions of noise; and reverse transforming the transformed seismic data to the time-space domain. | 08-23-2012 |
20120213033 | METHOD AND APPARATUS FOR DEGHOSTING SEISMIC DATA - Apparatus, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes inputting data recorded by detectors that are towed by a vessel, the data being associated with waves travelling from the subsurface to the detectors; applying a migration procedure to the data to determine a first image of the subsurface; applying a mirror migration procedure to the data to determine a second image of the subsurface; joint deconvoluting the first image and the second image for deghosting a reflectivity of the subsurface; and generating a final image of the subsurface based on the deghosted reflectivity of the joint deconvoluting step. | 08-23-2012 |
20120213032 | METHOD FOR PZ SUMMATION OF 3-DIMENSIONAL WIDE AZIMUTH RECEIVER GATHERS AND DEVICE - Apparatus, computer instructions and method for de-pegging seismic data related to a subsurface of a body of water. The method includes receiving as input recorded seismic data (H, G), wherein the recorded seismic data is recorded with a receiver having at least three components; extracting a three-dimensional (3D) gather from the recorded seismic data (H, G); separating up-going and down-going components (U, D) from the 3D gather using a 3D calibration operator (G | 08-23-2012 |
20120195164 | DEVICE AND METHOD FOR DETERMINING S-WAVE ATTENUATION IN NEAR-SURFACE CONDITION - Computing device and method for determining primary and ghost components from S-waves recorded in near-surface conditions, wherein the S-waves are refracted or reflected from a structure in a subsurface. The method includes a step of receiving seismic data (R, V) with regard to the S-waves, wherein the seismic data includes vertical and radial components recorded with a buried three-component receiver; a step of calculating with a processor a primary component (P) and a ghost component (G) from the vertical and radial components; and a step of computing an image of a subsurface based on the primary and ghost components (P, G). The S-waves form a plane wave. | 08-02-2012 |
20120176863 | PORTABLE DEVICE AND METHOD TO GENERATE SEISMIC WAVES - A portable seismic source for generating a seismic wave in the ground. The portable seismic source includes a casing containing an impulsive energy device; a base plate configured to be placed on the ground; and a stabilizing foot mechanism configured to be provided between the casing and the base plate. The stabilizing foot mechanism includes a stabilizer which is fixed relative to the casing and configured to be placed on the base plate and a stanchion that is configured to move relative to the stabilizer and to enter through the stabilizer and apply a force on the base plate when energy is applied from the impulsive energy device. | 07-12-2012 |
20120092956 | METHOD AND DEVICE TO ACQUIRE SEISMIC DATA - Streamer and method for deploying the streamer for seismic data acquisition related to a subsurface of a body of water. The method includes a step of releasing into the body of water, from a vessel, a body having a predetermined length together with plural detectors provided along the body; a step of towing the body and the plural detectors such that the plural detectors are submerged; and a step of configuring plural birds provided along the body, to float at a predetermined depth from a surface of the water such that a first portion of the body has a curved profile while being towed underwater. | 04-19-2012 |
20120069707 | METHOD FOR MONITORING A SUBSOIL ZONE, PARTICULARLY DURING STIMULATED FRACTURING OPERATIONS - The invention relates to a method for monitoring a subsoil zone, wherein a plurality of receivers are arranged on a surface of the soil or near said surface, straight above a geological zone to be monitored, comprising the following steps: generating a set of reference seismic data recording seismic data by means of said receivers; correlating the seismic data recorded ( | 03-22-2012 |
20120026833 | 3-D HARMONIC-SOURCE REVERSE TIME MIGRATION SYSTEMS AND METHODS FOR SEISMIC DATA ANALYSIS - Computing device and method for processing seismic traces to produce an image of a subsurface area. The method includes receiving a series of seismic traces related to the subsurface area and recorded by one or more seismic receivers, wherein the one or more seismic sources are originally generated by a source; applying a phase encoding function to the series of seismic traces, at least a portion of said seismic traces comprise signals reflected by geological interfaces of the subsurface area; applying a 3 dimensional (3D) harmonic-source reverse time migration of the series of seismic traces encoded with the phase encoding function; computing a forward wavefield by solving a first wave equation; computing a backward wavefield by solving a second wave equation; and cross-correlating the forward wavefield with the backward wavefield to generate an image of the subsurface. | 02-02-2012 |
20110305109 | METHOD AND APPARATUS FOR DEGHOSTING SEISMIC DATA - Apparatus, computer instructions and method for deghosting seismic data related to a subsurface of a body of water. The method includes inputting data recorded by detectors that are towed by a vessel, the data being associated with waves travelling from the subsurface to the detectors; applying a migration procedure to the data to determine a first image of the subsurface; applying a mirror migration procedure to the data to determine a second image of the subsurface; joint deconvoluting the first image and the second image for deghosting a reflectivity of the subsurface; and generating a final image of the subsurface based on the deghosted reflectivity of the joint deconvoluting step. | 12-15-2011 |
20110272207 | METHOD OF ACQUIRING VIBROSEISMIC DATA CONCERNING A ZONE OF THE SUBSOIL, AND SEISMIC EXPLORATION METHOD INCLUDING SUCH A METHOD - The invention concerns a method of acquiring vibroseismic data concerning a zone of the subsoil. This method comprises the following steps: —operating a vibroseismic source so that it transmits a first vibroseismic signal having a first amplitude ( | 11-10-2011 |
20110216625 | System for Seismic Exploration A Submerged Subsurface Including Implanted Bases - A system for seismic exploration of a submerged sub-surface comprises a plurality of bases ( | 09-08-2011 |
20110176384 | Method and Device for Processing Seismic Data - Apparatus, computer instructions and method for processing seismic data related to a subsurface of a body of water. The method includes inputting data indicative of recordings made by detectors provided on a curved profile in response to an acoustic wave reflected from the subsurface; applying a matched mirror migration procedure to the data, where (i) actual positions of the detectors on the curved profile and corresponding recordings, and (ii) fictitious mirror positions of the actual detectors on the curved profile and corresponding recordings with a changed sign are added in the matched mirror migration; and generating a final image of the subsurface based on the matched mirror migration procedure. | 07-21-2011 |
20110166790 | Seismic Processing for the Elimination of Multiple Reflections - Seismic processing method, in which, in order to eliminate multiple reflections on seismic data, seismic data are migrated in time or in depth ( | 07-07-2011 |