| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 367040000 | Received correlation | 13 |
| 20090067287 | Complex analysis of kinematics for non-hyperbolic moveout corrections - A computer-implemented method for processing data includes receiving a collection of traces corresponding to signals received over time at multiple locations due to reflection of seismic waves from subsurface structures. A measure of correlation among the traces as is computed a function of a set of wavefront parameters, which determine respective moveout corrections to be applied in aligning the traces. A matrix having at least three dimensions is generated, wherein the elements of the matrix include the computed measure of the correlation. Using the matrix, values of the wavefront parameters are identified automatically or interactively along the time axis or along selected horizons to maximize the measure of the correlation, and a seismic image of the subsurface structures is generated by aligning and integrating the traces using the moveout corrections that are determined by the identified values of the wavefront parameters. | 03-12-2009 |
| 20090185448 | METHOD FOR IMAGING THE EARTH'S SUBSURFACE USING PASSIVE SEISMIC SENSING - A method of imaging the Earth's subsurface using passive seismic emission tomography includes detecting seismic signals from within the Earth's subsurface over a time period using an array of seismic sensors, the seismic signals being generated by seismic events within the Earth's subsurface. The method further includes inducing a seismic event within the Earth's subsurface during at least a segment of the time period over which the seismic signals are detected. The method further includes cross-correlating seismic signals detected at each of the seismic sensors to obtain a reflectivity series at a position of each of the seismic sensors. | 07-23-2009 |
| 20090238041 | Systems and Methods For Monitoring Time-Dependent Subsurface Changes - Systems and methods for monitoring time-dependant subsurface changes from imperfectly repeated data measurements. | 09-24-2009 |
| 20100046324 | Complex Analysis of Kinematics for Non-Hyperbolic Moveout Corrections - A computer-implemented method for processing data includes receiving a collection of traces corresponding to signals received over time at multiple locations due to reflection of seismic waves from subsurface structures. A measure of correlation among the traces as is computed a function of a set of wavefront parameters, which determine respective moveout corrections to be applied in aligning the traces. A matrix having at least three dimensions is generated, wherein the elements of the matrix include the computed measure of the correlation. Using the matrix, values of the wavefront parameters are identified automatically or interactively along the time axis or along selected horizons to maximize the measure of the correlation, and a seismic image of the subsurface structures is generated by aligning and integrating the traces using the moveout corrections that are determined by the identified values of the wavefront parameters. | 02-25-2010 |
| 20100302904 | ANNULAR-SUM TRANSFORM OF IRREGULARLY SAMPLED SEISMIC DATA - A method for interpolating irregularly sampled seismic data, including receiving seismic data acquired at irregularly spaced seismic sensors in a survey area, defining a plurality of regularly spaced locations in the survey area, forming an annular ring around one of the plurality of regularly spaced locations, and interpolating the seismic data inside the annular ring to estimate seismic data that would have been acquired at the one of the plurality of regularly spaced locations. | 12-02-2010 |
| 20100315902 | METHOD FOR IMAGING THE EARTHS SUBSURFACE USING PASSIVE SEISMIC INTERFEROMETRY AND ADAPTIVE VELOCITY FILTERING - A method of imaging the Earth's subsurface using passive seismic interferometry tomography includes detecting seismic signals from within the Earth's subsurface over a time period using an array of seismic sensors, the seismic signals being generated by seismic events within the Earth's subsurface. The method further includes adaptively velocity filtering the detected signals. The method further includes cross-correlating the velocity filtered seismic signals to obtain a reflectivity series at a position of each of the seismic sensors. | 12-16-2010 |
| 20100329078 | INTERPOLATION AND/OR EXTRAPOLATION OF SEISMIC DATA - A method of processing seismic data is provided in the seismic data is acquired at a plurality of locations and the method comprises interpolating and/or extrapolating the seismic data, thereby to estimate seismic data at a target location different from the plurality of locations. The interpolating and/or extrapolating the seismic data is performed in a polar co-ordinate system. The method may provide for, among other things, accuracy of estimation; particularly at short offsets from the seismic source. The polar co-ordinate system used may be chosen to approximate the seismic wavefront in an earth model, for example in an earth model in which properties vary only with depth. | 12-30-2010 |
| 20110013483 | System and method for suppression of seismic multiple reflection signals - A method of modeling seismic wave-field data in order to suppress near-surface and sub-surface related multiple reflection signals is provided. The reflection signals include main primary reflection signals, main random noise signals, main multiple reflection signals, residual primary reflection signals, residual random noise signals, and residual multiple reflection signals. Main random noise signals are separated from the reflection signals using a frequency-wavenumber domain method to provide data having suppressed main random noise. Main primary reflection signals are separated from the data having suppressed main random noise using frequency-wavenumber filtering and weighted median filtering to provide data having suppressed main random noise and main primary reflections. Multiple reflection signals are modeled using parabolic path summation on the data having suppressed main random noise and main primary reflections. | 01-20-2011 |
| 20110158047 | SYNCHRONIZATION OF MODULES IN A WIRELESS ARRAY - Presented are systems and methods for wireless data acquisition. The wireless data acquisition may involve synchronizing modules within a data acquisition array. The synchronized data acquisition array may be used to facilitate a seismic survey. Synchronization may be facilitated by receipt of a reference time event such that a clock is synchronized based on the reference time event. | 06-30-2011 |
| 20110194378 | SEISMIC SOURCE SEPARATION - Seismic acquisition systems are disclosed that allow contemporaneous seismic sources to be separated from a composite signal comprising two or more constituent seismic sources. In some embodiments, a representation of the composite signal may be developed that includes a noise contribution of undesired signals present in the composite signal. Additionally, an operator, referred to herein as an “annihilator”, may be developed such that it may be conditioned and inverted to minimize undesired noise contributions in the composite signal. This inversion may assist in recovering the constituent seismic sources from the composite signal. Furthermore, in some embodiments, the accuracy with which the constituent source measurements are approximated may be increased by implementing them as random sweeps having a conventional length. | 08-11-2011 |
| 20110273960 | ANTENNA FOR SEISMIC SURVEY WITH UNIFORM SPATIAL SAMPLING IN WAVELENGTH - The present invention concerns a method and an antenna for active and/or passive seismic survey, such as a particular geometric layout of a plurality of vibration sensors, each one of adequate sensitivity, to be used with signal correlation in seismic surveys with or without an artificial wave source. In particular, the invention concerns a specific geometric layout of four vibration sensors, set along an alignment at positions, with one position chosen so that the antenna covers the desired wavelength interval. The sum of the signal correlations of all possible sensor couples allows a uniform sampling of all the spatial wavelengths that such an antenna defines, producing an accurate measure of the elastic and anelastic parameters of the subsoil and of the vibrational modes of a construction with the minimum possible number of sensors and minimum physical dimensions. | 11-10-2011 |
| 20120140594 | SEISMIC DATA APPARATUS AND METHODS - Methods and apparatus are provided related to seismic sensor data. Seismic sensor signaling is digitally sampled in accordance with a local clock and without synchronization to standardized time. Timestamp data is used to synthesize data correspondent to an artificial stimulus waveform. Cross-correlation of the synthesized data with the seismic sensor data yields a correlation result. The correlation result can be scaled to an original starting time for the seismic data sampling. The scaled correlation result can be stored in computer-accessible media and subject to further processing or interpretation. | 06-07-2012 |
| 20130028051 | FIELD CORRELATION FOR REAL-TIME PASSIVE SEISMIC SURVEILLANCE - There is provided herein a method of passive seismic acquisition that utilizes real time or near real time computation to reduce the volume of data that must be moved from the field to the processing center. Much of the computation that is traditionally applied to passive source data can be done in a streaming fashion. The raw data that passes through a field system can be processed in manageable pieces, after which the original data can be discarded and the intermediate results accumulated and periodically saved. These saved intermediate results are at least two, more likely three, orders of magnitude smaller than the raw data they are derived from. Such a volume of data is trivial to store, transport or transmit, allowing passive seismic acquisition to be practically used for continuous near-real-time seismic surveillance. | 01-31-2013 |
