Patent application number | Description | Published |
20090073805 | METHODS AND APPARATUS OF BOREHOLE SEISMIC SURVEYS - Methods and apparatus for borehole seismic survey are disclosed comprising a first seismic source under water at a first location and a second seismic source at a second, deeper location. Seismic signals from the seismic sources are recorded with synchronized sensors located in a borehole and source signature data are obtained by combining the recorded seismic signals such that low and high frequency content of the combined source signature data is extended relative to the source signature of the first seismic source and the second seismic source. | 03-19-2009 |
20090242205 | METHOD AND APPARATUS FOR DETECTING ACOUSTIC ACTIVITY IN A SUBSURFACE FORMATION - A method of monitoring acoustic activity in a formation from a wellbore includes positioning a flow manipulation device into the wellbore, the flow manipulation device defining a flow path through which fluid may flow. Fluid is then pumped into the wellbore and through the manipulation device. A sensor disposed near the manipulation device is then coupled to the formation, the formation is fractured with fluid, and acoustic events in the formation are detected with the sensor. | 10-01-2009 |
20110273966 | Reducing Noise in Seismic Surveying Environment - In one embodiment of the invention a method includes (a) operating a combustion engine at a first activity level corresponding to a first noise level; (b) charging an accumulator with a first pressure input; (c) lowering engine activity level of the engine to a second activity level corresponding to a second noise level that is lower than the first noise level; and (d) seismic sweeping with the vibrator based on the first pressure input and lowering engine noise from the first noise level to the second noise level. | 11-10-2011 |
20120008459 | SIMULTANEOUS OR NEAR-SIMULTANEOUS ACQUISITION FOR BOREHOLE SEISMIC - A technique facilitates performance of seismic profiling, such as three-dimensional vertical seismic profiling. A downhole acquisition system is provided with acoustic receivers designed to receive acoustic source signals. The firing of acoustic source signals is synchronized with the downhole acquisition system. Additionally, the firing of two or more acoustic source signals is controlled to provide simultaneous or nearly simultaneous timing of one acoustic source signal with respect to another acoustic source signal. A processing system is used to acquire and process a data stream of the initial shot and a data stream of the additional shot occurring simultaneously or nearly simultaneously. | 01-12-2012 |
20120069706 | Land Seismic Cable and Method - A seismic cable for use in land applications is described. The cable includes seismic sensors for measuring seismic signals reflected from subterranean or subsea formations. The cable may be deployed in trenches dug in the survey region to provide adequate sensor coupling to ground. Sensor units may be inline with the cable and may further be disposed in slim casings, thus facilitating handling and deployment. | 03-22-2012 |
20120081997 | Marine Vibrator with Improved Seal - A marine vibrator with improved seal is described. The marine vibrator includes a housing and piston within the housing for generating vibratory signals. The improved seal is comprised of a two-stage seal having a first seal disposed adjacent the water interface and a second seal disposed away from the water interface, thus improving the reliability of the marine vibrator. | 04-05-2012 |
20130044566 | Seismic Source Controller and Display System - A seismic survey system for performing offset borehole seismic survey measurement operations. The system may include a first seismic survey subsystem having a first wireless digital communication device and a second seismic survey subsystem having a second wireless digital communication device and remotely located from the first seismic survey subsystem. The first and second digital communication devices may be configured to provide a digital communication link for transporting digital information between the first seismic survey subsystem and second seismic survey subsystem. The system may be configured to enable a user at the first seismic survey subsystem to remotely modify at least a portion of a first plurality of operating parameters associated with at least one source signal device located at the second seismic survey subsystem. The system may also be configured to utilize GPS information in order to improve accuracy of source signal firing timing synchronization. | 02-21-2013 |
20130256055 | SEISMIC VIBRATOR HAVING AIRWAVE SUPPRESSION - A seismic vibrator includes a baseplate having a surface configured to couple to a ground surface. A driver is coupled to the baseplate and is configured to move the baseplate in a vibratory manner. A decoupling system is coupled to a part of the baseplate other than the ground-contacting surface. The decoupling system includes a first layer having a Young's modulus greater than that of a second layer coupled to the first layer. The second layer is coupled to the baseplate. The Young's moduli, thicknesses and masses of the first and second layer are selected to provide the decoupling system with a resonant frequency of at most, a spatial aliasing frequency of seismic sensors deployed on the ground surface or a lowest seismic frequency of interest. | 10-03-2013 |
20130272089 | ELECTROMAGNETICALLY DRIVEN MARINE VIBRATOR - A marine vibrator has a housing that comprises a displacement member, the displacement member having a first position and a second position, the housing and the displacement member together defining an internal volume. A linear electromagnetic motor interacts with the displacement member so as to move the displacement member between a first position and a second position and correspondingly strokes the displacement member to cover a volume. The linear electromagnetic motor comprises magnets and coils that when energized create an electromagnetic force there between, wherein the linear electromagnetic motor comprises a piston and a guide that substantially surrounds the piston. The piston has incorporated therein either the coils or the magnets, and the guide having incorporated therein the other of the coils or the magnets. The piston is in interaction with the displacement member. | 10-17-2013 |
20130333974 | SOURCE ACQUISITION WITH MULTIPLE FREQUENCY COMPONENTS - A seismic source array includes a first source and a second source. The first source has a first spectral output and the second source has a second spectral output different than the first spectral output. The first source has a first total volume different than a second total volume of the second source. | 12-19-2013 |
20130343157 | Neutrally-Buoyant Borehole Investigation Tools and Methods - The disclosure provides neutrally-buoyant tools for seismic data collection. The tools may range from several hundred meters to several kilometers in length and have integrated sensors which move along with the borehole fluid in response to a passing seismic wave. The disclosure also provides methods of deploying neutrally-buoyant tools, which includes using a tractor, adding a weight or both to the tool in order to overcome the difficulty of lowering a neutrally buoyant tool into a borehole, and optionally occasionally clamping the tool to the borehole to alleviate tension in the tool. This disclosure also provides methods of acquiring seismic data, which involves positioning a neutrally-buoyant tool in a borehole such that the tool is able to move relatively freely along with the borehole fluid in response to a seismic wave passing through the fluid, firing a seismic source, and using the sensors to collect seismic data generated thereby. | 12-26-2013 |
20130343158 | Borehole Seismic Acquisition Tools, Systems and Methods - A tool is described for seismic data collection which may have sensors mounted along its entire length to sample both geophysical signal and noise including at least one of acoustic noise, system noise, and noise resulting from the interaction between the two. Systems and methods for acquiring borehole seismic data are also described. In contrast to conventional systems which attempt to avoid introducing noise into the collected data stream, the present systems include a sufficient type, number, and spacing of sensors to intentionally sample at least one source of noise. The methods include operating a borehole seismic acquisition system to sample both a target signal and at least one source of noise and using a processor with machine-readable instructions for separating the noise from the signal. | 12-26-2013 |