Signal Processing Patents (Class 367/21)
  • Publication number: 20130028048
    Abstract: Disclosed are apparatus and methods for seismic imaging which accounts for sea-surface variations. In accordance with one embodiment, a source wave-field is forward propagated to a subsurface level below a sea floor. In addition, a receiver wave-field is backward propagated to the subsurface level, wherein the backward propagation in time comprises synchronized backward running of the sea surface. Other embodiments, aspects, and features are also disclosed.
    Type: Application
    Filed: July 25, 2011
    Publication date: January 31, 2013
    Inventor: Walter SÖLLNER
  • Publication number: 20130003498
    Abstract: A method for estimating an underwater acoustic sound velocity in a network of acoustic nodes arranged along towed acoustic linear antennas and in which a plurality of acoustic signals are transmitted between the nodes. The method includes: obtaining two predetermined distances each separating a couple of nodes placed along a same first acoustic linear antenna (31); for each couple of first and second nodes, obtaining a first propagation duration of an acoustic signal transmitted between said first node and a third node placed along a second acoustic linear antenna and a second propagation duration of an acoustic signal transmitted between said second node and said third node; and estimating said underwater acoustic sound velocity, as a function of said two predetermined distances and said first and second propagation durations obtained for each couple of nodes.
    Type: Application
    Filed: June 28, 2012
    Publication date: January 3, 2013
    Applicant: SERCEL
    Inventors: Christophe L'Her, Dominique Barbot
  • Publication number: 20120307591
    Abstract: Disclosed are apparatus and methods for seismic exploration using pressure changes caused by sea-surface variations as a low-frequency seismic energy source. One embodiment relates to a method which obtains dual wave-fields measured below a sea surface. The measured dual wave-fields are decomposed into a down-going wave-field and an up-going wave-field at a selected observation level. Seismic images are then generated using the down-going and up-going wave-fields. Other embodiments, aspects, and features are also disclosed.
    Type: Application
    Filed: May 31, 2011
    Publication date: December 6, 2012
    Inventors: Stian HEGNA, Walter SÖLLNER
  • Patent number: 8325559
    Abstract: A system and method of processing seismic data obtained using a plurality of towed single-component receivers in a marine environment is described, the towed single-component receivers configured to measure compressional P waves. The method comprises retrieving seismic data from a storage device, the seismic data comprising P-P data and shear mode data, wherein the P-P data and shear mode data were both received at the towed single-component receivers configured to measure compressional P waves to generate the seismic data. The method further comprises processing the seismic data to extract SV-P shear mode data and generating shear mode image data based on the extracted shear mode data.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: December 4, 2012
    Assignee: Board of Regents of the University of Texas System
    Inventor: Bob A. Hardage
  • Publication number: 20120294112
    Abstract: A system and method measures the time offsets of a plurality of acoustic sensor nodes relative to a reference time. The system includes an acoustic transceiver arranged to transmit a first signal to each acoustic sensor node and a processing resource arranged to record the transmission time of the first signal relative to the reference time. The acoustic sensor nodes receive the first signal and transmit a return second signal to the acoustic transceiver after a predetermined time delay, the second signal including the current acoustic sensor node internal time. The acoustic transceiver receives the second signal, and the processing resource records the time at which the second signal was received relative to the reference time and records also the combined time of flight of the first and second signal. From this data the time offset between the sensor node internal time and the reference time is calculated.
    Type: Application
    Filed: May 17, 2012
    Publication date: November 22, 2012
    Applicant: Sonardyne International Limited
    Inventors: Christopher Pearce, Shaun Dunn
  • Publication number: 20120287753
    Abstract: A method for identifying clock timing discrepancies in a plurality of clocks that are each associated with a seismic receiver, comprises the steps of collecting from at least a pair of receivers a data set corresponding to a selected time period, cross-correlating the data sets between at least one pair of receivers so as to produce cross-correlated data for positive, zero, and negative time lags, comparing the cross-correlated data for the positive and negative time lags to measure a timing asymmetry about the zero-lag time, and, for a receiver pair for which there is a non-zero timing asymmetry, using the asymmetry to identify a timing discrepancy between the clocks associated with that receiver pair. The each data set can be filtered so as to obtain data in a selected frequency range, which may avoid an active shot frequency. The data may be collected in the absence of active seismic shots.
    Type: Application
    Filed: December 2, 2010
    Publication date: November 15, 2012
    Inventors: Paul James Hatchell, Kurang Jvalant Mehta
  • Patent number: 8300497
    Abstract: A method for reducing noise in a towed acoustic array includes providing a towed array having a length, diameter, frequency range and tow speed. The relationship between tension in the towed array and wall pressure fluctuation spectral levels is determined. Wall pressure fluctuation spectral levels are related to the noise in the array. An optimal towed array tension is calculated using the determined relationship. Tension is increased to the optimal towed array tension by either provided additional towed array hose or a drogue at the end of the towed array.
    Type: Grant
    Filed: March 22, 2010
    Date of Patent: October 30, 2012
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: William L. Keith, Kimberly M. Cipolla
  • Publication number: 20120218859
    Abstract: 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.
    Type: Application
    Filed: May 4, 2012
    Publication date: August 30, 2012
    Applicant: CGGVERITAS SERVICES SA
    Inventor: Robert SOUBARAS
  • Patent number: 8254206
    Abstract: A technique for use in towed-array, marine seismic surveys includes a method and an apparatus. The method includes accessing a set of multicomponent seismic data acquired in a wide tow, marine seismic survey; and interpolating a set of seismic data from the acquired seismic data in the crossline direction such that the combined acquired and interpolated seismic data meet the discrete spatial sampling theory requirements for array detection of broadside seismic signal and the discrimination and suppression of broadside linear noise. In some aspects, the technique includes programmed storage media and/or programmed computers for use in executing such a method. The apparatus is a wide tow array, including a plurality of streamers spaced apart by a cable separation exceeding the maximum cable spacing for array detection of broadside seismic signal and the discrimination and suppression of broadside linear noise as determined by discrete spatial sampling theory.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: August 28, 2012
    Assignee: WesternGeco L.L.C.
    Inventor: Lawrence C. Morley
  • Publication number: 20120176861
    Abstract: According to an embodiment of the instant invention there is provided a method for collecting a blended source seismic survey that utilizes new approach to determining a random time separation between successive shots. The random time separation may be drawn in some embodiments from a distribution of uniformly distributed numbers, with ?>1/(2 f), where ? is the half-width of the uniform distribution and f is the lowest frequency of interest in the survey.
    Type: Application
    Filed: January 12, 2012
    Publication date: July 12, 2012
    Applicant: BP CORPORATION NORTH AMERICA INC.
    Inventors: Raymond Lee Abma, Gerard Joseph Beaudoin, Zhiyong Jiang
  • Patent number: 8218393
    Abstract: A system includes an interface and a processor. The interface receives seismic datasets, which are associated with multiple firings of a set of at least one seismic source. Each dataset is acquired by seismic sensors during a different time period of a sequence of time periods that are limited by times at which the set of seismic source(s) are fired. The processor, for each of the firings of the set of seismic source(s), generates an associated shot record based on information contained at least two of the datasets.
    Type: Grant
    Filed: June 30, 2008
    Date of Patent: July 10, 2012
    Assignee: WesternGeco L.L.C.
    Inventor: Craig J. Beasley
  • Publication number: 20120163120
    Abstract: Sensors used in mapping strata beneath a marine body and/or structures on a marine body floor are described, such as in a flexible buoyancy adjustable towed array. A first sensor is a traditional acoustic sensor or a novel acoustic sensor using a piezoelectric sensor mounted with a thin film separation layer of flexible microspheres on a rigid substrate. Additional non-acoustic sensors are optionally mounted on the rigid substrate for generation of output used to reduce noise observed by the acoustic sensors. Combinations of acoustic, non-acoustic, and motion sensors co-located in rigid streamer housing sections are provided, which reduce noise associated with different sensor locations and/or localized turbulence.
    Type: Application
    Filed: December 24, 2011
    Publication date: June 28, 2012
    Inventor: Richard E. Pearce
  • Publication number: 20120163121
    Abstract: A system and method of processing seismic data obtained using a plurality of towed single-component receivers in a marine environment is described, the towed single-component receivers configured to measure compressional P waves. The method comprises retrieving seismic data from a storage device, the seismic data comprising P-P data and shear mode data, wherein the P-P data and shear mode data were both received at the towed single-component receivers configured to measure compressional P waves to generate the seismic data. The method further comprises processing the seismic data to extract SV-P shear mode data and generating shear mode image data based on the extracted shear mode data.
    Type: Application
    Filed: March 6, 2012
    Publication date: June 28, 2012
    Inventor: Bob A. Hardage
  • Patent number: 8203906
    Abstract: The technologies described herein include systems and methods for performing a first seismic survey and performing a second seismic survey after a predetermined amount of time has lapsed between the first seismic survey and the second seismic survey. The shot times and the shot positions of the second seismic survey may be substantially the same as the shot times and the shot positions of the first seismic survey. After performing the seismic surveys, seismic data generated by the first seismic survey may be processed to generate a first image, and seismic data generated by the second seismic survey may be processed to generate a second image. After generating the first and second images, a difference between the first image and the second image may be computed to generate a time lapse difference image.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: June 19, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Johan O. A. Robertsson, Dirk-Jan Van Manen, David Halliday, Robert Laws
  • Publication number: 20120147700
    Abstract: A technique includes receiving data indicative of acoustic measurements acquired by receivers disposed on a seismic receiver spread including at least one streamer. The technique includes processing the data in a machine to determine a depth and/or shaped of the spread.
    Type: Application
    Filed: December 14, 2010
    Publication date: June 14, 2012
    Inventors: Svein Arne Frivik, Nicolas Goujon, Halvor S. Groenaas
  • Publication number: 20120134234
    Abstract: In seismic survey for icy waters, streamers are towed behind a vessel under the water's surface to avoid ice. GPS readings may not be consistently obtained because the ice prevents a tail buoy with a GPS receiver from trailing from streamer at the surface. Instead, a device tows on the streamer under the water's surface. The streamer's absolute position is tracked by intermittently bringing the towed device toward the surface so GPS readings can be obtained. The streamer's absolute position can then be used in conjunction with compass readings and can correlate various seismic sensor signals obtained along the streamer during the survey. The compass readings can be corrected for declination using declinometer readings, which can be compensated for iron effects from the vessel or other device carrying the declinometer.
    Type: Application
    Filed: May 23, 2011
    Publication date: May 31, 2012
    Applicant: ION Geophysical Corporation
    Inventors: Phillip Roberts, Robert Fischer, Noel Zinn, Curt Schneider, Joseph R. Gagliardi, Shawn Rice, Timothy A. Dudley, John Grant, Kevin Simpson
  • Publication number: 20120134235
    Abstract: Autonomous self-pop-up multicomponent bottom nodes (self-pop-up nodes SPN) are deployed to the bottom of an exploration area along parallel lines of exploration at specified spaced points by a recording vessel. At least one seismic source mounted on a shooting vessel continuously fires seismic energy. The shooting vessel travels between the SPN deployment lines. The direction of the sailing direction is parallel to the aforesaid lines. A source vessel is initially located at a distance from the first SPN deployment line. Every SPN records seismic waves. Upon the source vessel passes the half of the lines, the recording vessel starts on-going relocation of the deployed SPNs to the next exploration lines starting with the SPNs on the first exploration line. Collection of SPNs occurs by the recording vessel equipped with a hydro-acoustic communication system with SPNs throughout its ongoing sailing along the SPNs deployment lines. Thereafter acquired data are processed.
    Type: Application
    Filed: November 28, 2011
    Publication date: May 31, 2012
    Applicant: ZAO "GEONOD RAZVEDKA"
    Inventors: Dmitry Anatolyevich ILINSKY, Elena Anatolyevna ILINSKY
  • Publication number: 20120113748
    Abstract: A method for spatial sampling of a seismic wavefield at the bottom of a water layer at an effective spatial sampling denser than the physical layout of the sensors. The sensors comprise a sensing element for vertical particle motion and a sensing element for rotational motion around a horizontal axis. Stress and wavefield conditions allow the rotational sensing element to yield the transverse horizontal gradient of the vertical particle motion wavefield, used in ordinate and slope sampling to yield improved transverse spatial sampling of the vertical particle motion wavefield.
    Type: Application
    Filed: October 24, 2011
    Publication date: May 10, 2012
    Applicant: Geokinetics Acquisition Company Inc.
    Inventor: Robert H. Brune
  • Publication number: 20120113747
    Abstract: A method for processing seismic data. The method includes receiving the seismic data acquired at one or more receivers due to one or more marine vibroseis sources that emit one or more vibroseis sweeps. The method then applies a receiver motion correction algorithm to the received seismic data to generate receiver motion corrected seismic data. After generating the receiver motion corrected seismic data, the method transforms the receiver motion corrected seismic data into a temporal Fourier domain to generate seismic data as a function of frequency. The method then reconstructs the transformed seismic data as a function of frequency to correct for one or more motions of the one or more marine vibroseis sources. After reconstructing the transformed seismic data, the method transforms the reconstructed seismic data to the time domain. The method then generates a seismic image of a subsurface of the Earth based on the transformed reconstructed seismic data.
    Type: Application
    Filed: November 4, 2010
    Publication date: May 10, 2012
    Inventor: Ralf G. Ferber
  • Patent number: 8174926
    Abstract: A first weighted integral operator is applied to dual-sensor data to extrapolate the dual-sensor data to a first position above an acquisition surface, generating extrapolated data. A second weighted integral operator is applied to the extrapolated data to extrapolate the extrapolated data to a second position, generating wavefield separated data. One of the integral operators is applied to a scaled combination of the dual sensor data.
    Type: Grant
    Filed: January 20, 2009
    Date of Patent: May 8, 2012
    Assignee: PGS Geophysical AS
    Inventor: Tilman Klüver
  • Publication number: 20120099395
    Abstract: A method and system that can be used for scanning underwater structures. The method and system allow a user to gain a better understanding of an underwater structure. For example, the method and system detect change(s) to an underwater structure. An acoustic sonar wave is directed toward an underwater structure, and a reflected acoustic sonar wave is received and processed to produce a three dimensional image. Data points of this three-dimensional image of the underwater structure are aligned to a pre-existing three dimensional model of the underwater structure. A change detection model is generated based on the aligned 3D images, and the change detection model is compared to the pre-existing three dimensional model of the underwater structure. Based on the comparison, occurrences of structural changes in the underwater structure are detected.
    Type: Application
    Filed: October 25, 2011
    Publication date: April 26, 2012
    Applicant: LOCKHEED MARTIN CORPORATION
    Inventors: Christian H. Debrunner, Alan K. Fettinger, Christopher L. Baker
  • Patent number: 8164977
    Abstract: Various methods for simulating up-going pressure wavefield data. In one implementation, a processing apparatus may receive pressure data from pressure sensors that may be installed on a first and second streamer of an over/under streamer pair. The processing apparatus may also receive velocity data from velocity sensors that may be installed on the second streamer of the over/under streamer pair. Using the pressure and velocity data obtained from the sensors installed on each streamer, the processing apparatus may simulate the pressure and velocity data that would have been obtained by a streamer in a calm sea at a depth equal to the vertical distance between the first and second streamers. The simulated pressure and velocity data may then be combined to estimate the up-going pressure wavefield data.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: April 24, 2012
    Assignee: WesternGeco L.L.C.
    Inventor: Ralf G. Ferber
  • Publication number: 20120092957
    Abstract: The various embodiments herein provide a method to acquire seismic data to estimate reservoir characteristics in a shallow sea water environment. According to an embodiment herein, a method comprises acquiring four component ocean bottom cable (4C OBC) seismic data using a hydrophone and a three component geophone by varying a time delay between the shots and spacing between the shots. A full acoustic modelling process and an elastic modelling process are applied to the acquire 4C OBC seismic data to acquire a pressure data and an inline geophone data to estimate a horizontal component data and a reflected shear wave data. The estimated horizontal component data are NMO corrected and stacked by varying sampling intervals to remove noise component in the acquired seismic data. A shear wave energy data is estimated from the acquired pressure data to estimate shear wave properties of a sea bed and a subsurface carbonate reservoir.
    Type: Application
    Filed: October 12, 2011
    Publication date: April 19, 2012
    Applicants: The Petroleum Institute, Dr. Karl-Andreas Berteussen, Dr. Yuefeng Sun, Texas A&M Research Foundation
    Inventors: Karl-Andreas Berteussen, Yuefeng Sun
  • Publication number: 20120087207
    Abstract: A method of monitoring a marine seismic source array comprises, consequent to actuation of a seismic source array (14), making a near-field measurement of seismic energy emitted by the seismic source array (14), using at least one near field sensor (15) and also acquiring seismic data using at least one seismic receiver (18). The far-field signature of the source array at one or more of the receiver location(s) is estimated from the near-field measurements of the emitted seismic energy, and this is compared with seismic data acquired at the receiver(s). This provides an indication of whether the source array and the method for predicting far-field signatures are operating correctly.
    Type: Application
    Filed: February 19, 2010
    Publication date: April 12, 2012
    Applicant: WesternGeco LLC
    Inventors: Clement Kostov, Jon-Fredrik Hopperstad, Philip Kitchenside, Johan Olof Anders Robertsson
  • Publication number: 20120075950
    Abstract: Embodiments of the invention provide a method of processing marine seismic data, the data having been acquired using a “dense over/sparse under” streamer array having N over streamers disposed at a first depth and M under streamers disposed at a second depth greater than the first depth, where 0<M<N. The method comprises: a) processing seismic data for one of the over streamer target locations and seismic data for one of the under streamer target locations; b) processing seismic data for another of the over streamer target locations; and c) combining the result of (a) and the result of (b). The one of the over streamer target locations and the one of the under streamer target locations may lie in a vertical plane.
    Type: Application
    Filed: January 18, 2010
    Publication date: March 29, 2012
    Applicant: WESTERNGECO LLC
    Inventors: Julian Edward Kragh, Anthony Curtis, Gabriele Busanello
  • Publication number: 20120069704
    Abstract: A method for marine seismic surveying includes determining at least an initial depth of a plurality of spaced apart seismic sensors in a body of water. The sensors each include a substantially collocated pressure responsive sensor and motion responsive sensor. A ghost time delay is determined for each sensor based on the at least an initial depth. Seismic signals detected by each motion responsive sensor and each pressure responsive sensor are cross ghosted. The at least initial depth is adjusted, and the determining ghost time delay and cross ghosted seismic signals are repeated until a difference between the cross ghosted motion responsive signal and the cross ghosted pressure responsive signal falls below a selected threshold. Other embodiments, aspects and features are also disclosed.
    Type: Application
    Filed: October 17, 2011
    Publication date: March 22, 2012
    Inventor: Guillaume Cambois
  • Patent number: 8139440
    Abstract: A method for spectrally conditioning surface seismic data. In one implementation, the method may include correcting surface seismic data for distortions due to anomalous spectral amplitudes, thereby generating a first set of corrected data; correcting the first set of corrected data for deterministic distortions, thereby generating a second set of corrected data; correcting the second set of corrected data for spectral distortions due to the seismic waves traveling through the near-surface, thereby generating a third set of corrected data; and correcting the third set of corrected data for spectral distortions due to the seismic waves traveling through deeper strata.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: March 20, 2012
    Assignee: WesternGeco L.L.C.
    Inventors: Ralf Ferber, Debra Dishberger, Alan Teague
  • Publication number: 20120051175
    Abstract: A method for determining a longitudinal position of at least one geophysical sensor on a towed marine streamer includes measuring a parameter related to tension at least one position along the streamer. A change in length of the streamer is determined using the measured parameter. The longitudinal position of the at least one sensor is determined. A marine streamer includes at least one geophysical sensor and at least one tension sensor capable of measuring a parameter related to axial tension.
    Type: Application
    Filed: August 26, 2010
    Publication date: March 1, 2012
    Inventors: Gustav Göran Mattias Südow, Andras Robert Juhasz
  • Publication number: 20120033526
    Abstract: Seismic data are acquired by actuating a first source at a first time and one or more additional seismic sources each with their own characteristic times with respect to a time of signal recording, the sources substantially collocated and at different depths. A first wavefield is determined that would occur if the first source were actuated at a selected time with respect to an initiation time of the recordings and being time adjusted for the water depth. One or more additional wavefields are determined that would occur if the one or more additional sources were each actuated at said selected time with respect to said initiation time, and being time adjusted for water depths of the one or more additional sources. The first wavefield and the one or more additional wavefields are combined to determine a deghosted source wavefield corresponding to actuation of a single seismic energy source.
    Type: Application
    Filed: August 5, 2010
    Publication date: February 9, 2012
    Inventors: STIAN HEGNA, GREGORY ERNEST PARKES
  • Publication number: 20120026829
    Abstract: Three-axis velocity data, obtained along with pressure data in a marine seismic survey, are rotated to a ray direction. Plane wave decomposition is applied in the ray direction to the rotated velocity data. The pressure data and the velocity data are combined to generate at least one of up-going and down-going wave fields. The at least one of up-going and down-going wave fields are used in a time-space domain to image the earth's subsurface.
    Type: Application
    Filed: July 30, 2010
    Publication date: February 2, 2012
    Inventor: Stian Hegna
  • Publication number: 20120020186
    Abstract: In various disclosed seismic imaging systems and methods, a fast target-oriented illumination calculation technique is employed to obtain a data volume or “matrix” of approximate illumination values. These illumination values enable an image matrix of “true reflectivity” values to be found. The illumination values are derived from Green's functions which, rather than being calculated and re-calculated on a shot-by-shot basis, are calculated in multi-shot groups and combined with a rolling-sum to greatly reduce the computational overhead. As a consequence, the disclosed systems and methods can provide target region illuminations more quickly and/or with higher quality than those systems relying on conventional 3D wave-equation illumination.
    Type: Application
    Filed: April 16, 2009
    Publication date: January 26, 2012
    Applicant: LANDMARK GRAPHICS CORPORATION
    Inventors: Mingqiu Luo, Shengwen Jin
  • Publication number: 20120020185
    Abstract: One embodiment of the invention concerns a probe that couples to a seismic vessel via a tow cable. When deploying probes from a seismic vessel that is towing source arrays and streamers, the probe and its tow cable can tangle with elements of the towed seismic spread. However, a cable guide may be used to lessen the risk for such entanglement by guiding the tow cable into the water at a distance removed from the seismic spread. Also, the probe may be steerable to steer the probe and tow cable away from the seismic spread. Other embodiments are described herein.
    Type: Application
    Filed: September 13, 2010
    Publication date: January 26, 2012
    Inventors: Kenneth E. Welker, Ulrich Hemmerle, Ottar Kristiansen, Morten Svendsen, Julian Edward (Ed) Kragh
  • Publication number: 20120008458
    Abstract: Methods to attenuating strong marine seismic noises using singular value decomposition, determining noisiest traces and estimating noise components only from these traces, iteratively estimating the noise and protecting signal behind the noise. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. 37 CFR 1.72(b).
    Type: Application
    Filed: July 8, 2010
    Publication date: January 12, 2012
    Inventor: Nicolae Moldoveanu
  • Patent number: 8095320
    Abstract: Systems, program product, and methods of suppressing residual water bottom energy in seismic data, are provided. An example of a system, program product, and method can be applied to post-stack datasets and can combine multi-channel deconvolution with novel sorting keys to efficiently identify and suppress residual water bottom energy in common depth point (CDP) stacked seismic data, thereby increasing the resolving power of seismic data leading to an improved interpretation of seismic signals reflected from oil reservoirs.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: January 10, 2012
    Assignee: Saudi Arabian Oil Company
    Inventors: Roy Matthew Burnstad, Mahmoud Elabd Hedefa
  • Publication number: 20120002504
    Abstract: A technique facilitates collection and use of data on subterranean formations. The technique comprises creating a distributed sensor network having multiple sensors arranged in a desired pattern. The distributed sensor network is employed to collect seismic data from the multiple sensors. Additionally, the distributed network and sensors are designed to collect gravity data from the multiple sensors. The sensors may be arranged in a variety of environments, including land-based environments and seabed environments.
    Type: Application
    Filed: August 11, 2011
    Publication date: January 5, 2012
    Inventors: Everhard MUYZERT, Philip A.F. Christie, Nicolas Goujon, Julian Edward (ED) Kragh, Johan O.A. Robertsson
  • Publication number: 20110317517
    Abstract: A disclosed seismic survey system includes one or more streamer(s) each having multiple spaced apart sensor units, and a data recording and control system. Each sensor unit receives a command from the data recording and control system, and operates in an enabled state or a disabled state dependent upon the command. The data recording and control system collects and stores data from enabled sensor units. The sensor units produce data when in the enabled state, and dissipate significantly less electrical power in the disabled state. A described sensor unit includes one or more sensor(s), an analog-to-digital converter, and a control unit that enables or disables the analog-to-digital converter dependent upon the command. A disclosed method for acquiring seismic survey data includes issuing an enable or disable command to each of multiple spaced apart sensor units, and receiving and storing data from those sensor units that are enabled.
    Type: Application
    Filed: June 29, 2010
    Publication date: December 29, 2011
    Inventors: Claes Nicolai Børresen, Stig Rune Lennart Tenghamn
  • Patent number: 8086426
    Abstract: A method of processing seismic data representing a physical system, the method comprising a difference between first and second seismic data representing the system in first and second states, respectively, and inverting the difference in accordance with a parameterized model of the physical system to obtain changes in the parameters of the model.
    Type: Grant
    Filed: December 23, 2004
    Date of Patent: December 27, 2011
    Assignee: Statoil ASA
    Inventors: Youness El Ouair, Arild Buland, Ola Eiken
  • Publication number: 20110310700
    Abstract: The technologies described herein include systems and methods for performing a first seismic survey and performing a second seismic survey after a predetermined amount of time has lapsed between the first seismic survey and the second seismic survey. The shot times and the shot positions of the second seismic survey may be substantially the same as the shot times and the shot positions of the first seismic survey. After performing the seismic surveys, seismic data generated by the first seismic survey may be processed to generate a first image, and seismic data generated by the second seismic survey may be processed to generate a second image. After generating the first and second images, a difference between the first image and the second image may be computed to generate a time lapse difference image.
    Type: Application
    Filed: August 26, 2011
    Publication date: December 22, 2011
    Inventors: Johan O. A. Robertsson, Dirk-Jan Van Manen, David Halliday, Robert Laws
  • Publication number: 20110310699
    Abstract: A technique includes receiving data indicative of a wavefield in a processor-based system and processing the data on the processor-based system to generate a modeled wavefield. The processing includes varying boundary conditions of the modeled wavefield with respect to time to regulate coherent boundary reflections in the modeled wavefield.
    Type: Application
    Filed: June 17, 2010
    Publication date: December 22, 2011
    Inventors: Johan O. A. ROBERTSSON, Robin FLETCHER
  • Patent number: 8077543
    Abstract: A method and apparatus implementing a technique for mitigating noise in seismic data are presented. The technique includes estimating a noise component in a set of multicomponent seismic data representing a recorded wavefield from the relationship at the free surface of an upgoing component and a downgoing component decomposed from the recorded wavefield; and removing the estimated noise component from the seismic data. The noise component can be estimated by decomposing a recorded wavefield into an upgoing component and a downgoing component and isolating a noise component in the recorded wavefield from the relationship of the decomposed upgoing and downgoing components at the free surface.
    Type: Grant
    Filed: April 17, 2007
    Date of Patent: December 13, 2011
    Inventors: Dirk-Jan van Manen, Johan Olof Anders Robertsson
  • Patent number: 8077544
    Abstract: Method for attenuating surface multiple reflections in dual-wavefield seismic data. In one implementation, the method may include: (a) performing wavefield separation on dual-wavefield seismic data to separate events in the seismic data into data sets according to ghost characteristics; (b) applying a multidimensional Surface-Related Multiple Elimination (SRME) to two or more of the data sets to yield an SRME result in a manner that retains surface reflection information affecting surface multiple reflections; and (c) repeating step (b) one or more times.
    Type: Grant
    Filed: March 28, 2008
    Date of Patent: December 13, 2011
    Assignee: Westerngeco L.L.C.
    Inventor: William Henry Dragoset, Jr.
  • Publication number: 20110299361
    Abstract: The present invention relates to an imaging technique for modeling a subsurface structure through waveform inversion in the Laplace domain. According to the present invention, a source equivalent to the real source is calculated. The equivalent source is at least one source arranged on a virtual grid of the area to be measured, and the virtual grid has a large size which cannot be employed as the location of the real source in conventional techniques. The equivalent source has a vector obtained by multiplying an analytical solution vector and an impedance matrix of a Laplace domain wave equation, wherein said analytical solution vector is obtained from the analytical solution of a Laplace domain wave equation in a homogeneous half space by the real source.
    Type: Application
    Filed: February 17, 2010
    Publication date: December 8, 2011
    Inventor: Changsoo Shin
  • Patent number: 8072841
    Abstract: A method for generating a synthetic seismogram. In one implementation, a ray tracing may be performed on a subsurface. The ray tracing may generate a plurality of rays. A first seismic wavefront may be reconstructed by triangulating a first plurality of control points that correspond to the plurality of rays. Each control point may represent an end point of a ray at the first seismic wavefront. The plurality of rays may be propagated to a second seismic wavefront. The second seismic wavefront may have a hole associated with at least one missing ray at the second seismic wavefront. A plurality of points on a circle may be defined that correspond to a second plurality of control points defining the hole. The second seismic wavefront may be reconstructed based on the plurality of points on the circle.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: December 6, 2011
    Assignee: WesternGeco L.L.C.
    Inventors: Toshi Thomas Chang, Luis Canales, Alfonso Gonzalez
  • Publication number: 20110292761
    Abstract: A programmable computer is used to perform the following. 3D seismic data sets, corresponding to each azimuth in seismic data obtained from a multi-azimuth marine seismic survey, are migrated in grids oriented with the corresponding azimuth. Acquisition geometry is stored for each trace in the seismic data sets for each azimuth. Residual analysis, based on the corresponding azimuth, is performed on each of the migrated data sets, generating residuals and reflectors for each azimuth. The residuals and reflectors generated for each azimuth are rotated and merged on a master grid. Reflection tomographic inversion is applied iteratively to the rotated and merged residuals and reflectors to update a velocity model using the acquisition geometry as based on the master grid. The earth's subsurface is imaged using the updated velocity model.
    Type: Application
    Filed: May 27, 2010
    Publication date: December 1, 2011
    Inventors: Junru Jiao, Chaoguang Zhou, Yeashung Sonny Lin, Sverre Brandsberg-Dahl
  • Publication number: 20110273958
    Abstract: There is provided herein a system and method of seismic exploration that produces improved locations and timings for ocean bottom seismometers. The instant method utilizes linearized inversion in conjunction with a conventionally accurate clock to provide both time and positioning for each OBS unit with high accuracy as compared with the prior art approach. Inversion is one mathematical tool that effectively performs the requisite triangulation. Furthermore, the clock drift can be accounted for in the inversion scheme. The inversion not only determines the OBS position and shot timing errors, but also estimates the accuracy of the position and timing determination.
    Type: Application
    Filed: May 6, 2011
    Publication date: November 10, 2011
    Applicants: BP Exploration Operating Company Limited, BP Corporation North America Inc.
    Inventors: Ganyuan Xia, Gerard Beaudoin
  • Publication number: 20110261646
    Abstract: A method of acquiring marine seismic data using an acoustic source to generate an acoustic signal, a portion of which is reflected at one or more subsurface formation interfaces as a seismic signal is described. The method includes sailing a surface vessel along a sail line which lies over a survey area while towing a seismic streamer, the sail line having a sinusoidal configuration defined by an amplitude and a wavelength. The streamer includes a plurality of hydrophones for receiving the reflected portion of the acoustic signal. The method is characterised in that the streamer follows the sinusoidal configuration of the sail line while seismic data is acquired, the streamer having a length at least equal to the distance travelled by the surface vessel as it sails along one full wavelength of the configuration as measured along the sinusoidal sail line.
    Type: Application
    Filed: November 24, 2010
    Publication date: October 27, 2011
    Applicant: WOODSIDE ENERGY LIMITED
    Inventors: Malcolm Donald MacNeill, Joe Frank McNutt
  • Publication number: 20110242935
    Abstract: A method of providing seismic data (such as marine seismic data). A seismic source is actuated at a plurality of source locations (S2, S4). For each source location, a multicomponent seismic measurement is performed at least one receiver location (S3). A reconstructing method is applied to each multicomponent measurement to obtain additional data corresponding to source locations additional to the source locations at which the source was actuated (S5). The additional data are output and/or used (S6).
    Type: Application
    Filed: April 1, 2011
    Publication date: October 6, 2011
    Inventors: Lasse Amundsen, Harald Westerdahl, Mark Thompson
  • Publication number: 20110228636
    Abstract: An embodiment according to one or more aspects of the present disclosure for conducting a marine survey includes a survey spread comprising a plurality of receivers and an energy source that is towed along a selected course while a signal is emitted from an energy source. A plurality of receivers receive data comprising a detection sampling frequency and a survey sampling frequency. The survey sampling frequency is monitored to detect a cetacean vocalization and to position the cetacean at least while conducting the seismic survey. Pursuant to the location of the cetacean actions can be taken to protect the cetacean and to minimize disruptions in conducting the seismic survey.
    Type: Application
    Filed: May 30, 2011
    Publication date: September 22, 2011
    Inventors: Iranpour Kambiz, Sevin Arne Frivik, Espen Gulbransen, Halvor Sehested Groenaas
  • Patent number: 8024123
    Abstract: A method for predicting subterranean formation properties of a wellsite. The method includes obtaining seismic data for an area of interest, obtaining an initial seismic cube using the seismic data, and obtaining a shifted seismic cubes using the seismic data, where each of the shifted seismic cubes is shifted from the initial seismic cube obtaining a shifted seismic cubes using the seismic data, where each of the shifted seismic cubes is shifted from the initial seismic cube. The method further includes generating a neural network using the initial seismic cube, the shifted seismic cubes, and well log data and applying the neural network to the seismic data to obtain a model for the area of interest, where the model is used to adjust an operation of the wellsite.
    Type: Grant
    Filed: November 4, 2008
    Date of Patent: September 20, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Ivan Priezzhev, Gaston Bejarano, Leo Shmaryan
  • Publication number: 20110211423
    Abstract: A technique facilitates collection and use of data on subterranean formations. The technique comprises obtaining gravity measurements through the use of seismic streamers. At least one streamer is provided such that each streamer has multiple sensors, e.g. accelerometers. The at least one streamer is towed with a tow vessel, and gravity data are accumulated via the multiple sensors during towing.
    Type: Application
    Filed: November 3, 2010
    Publication date: September 1, 2011
    Inventors: Everhard Muyzert, Philip A. F. Christie, Nicolas Goujon, Julian Edward (Ed) Kragh, Johan O. A. Robertsson