Reverberation Removal Patents (Class 367/24)
  • Patent number: 10649107
    Abstract: The present disclosure is related to methods, systems, and machine-readable media for interference attenuation of a residual portion of seismic data, such as may be recorded in a marine seismic survey. Recorded seismic data can be separated into a portion attributed to a source and a residual portion. Seismic interference attenuation can be performed on the residual portion.
    Type: Grant
    Filed: November 28, 2017
    Date of Patent: May 12, 2020
    Assignee: PGS Geophysical AS
    Inventors: Rolf H. Baardman, Roald G. van Borselen, Steven Fishburn, Alan Ryder
  • Patent number: 10644676
    Abstract: An automatic filtering method includes: a step of analyzing an input signal so as to obtain a frequency spectrum of the input signal; and a step of selecting, on the basis of the frequency spectrum, at least one filter from among a plurality of preset filters and filtering the input signal. The step of selecting includes determining, on the basis of the frequency spectrum of, a signal type in the input signal; selecting, on a basis of the signal type, a corresponding filter corresponding to the signal type; filtering the input signal with use of a first parameter of the corresponding filter and setting a second parameter for the corresponding filter on a basis of a result of the filtering; and filtering the input signal with use of the second parameter set for the corresponding filter. The method may ensure a filtering effect against noise.
    Type: Grant
    Filed: October 26, 2017
    Date of Patent: May 5, 2020
    Assignee: OMRON Corporation
    Inventors: Hao Zhang, Haibin Yu, Liangyong Duan, Lei Xu
  • Patent number: 10598806
    Abstract: A method for estimating a time variant signal representing a seismic source obtains seismic data recorded by at least one receiver and generated by the seismic source, the recorded seismic data comprising direct arrivals and derives the time variant signal using an operator that relates the time variant signal to the acquired seismic data, the operator constrained such that the time variant signal is sparse in time.
    Type: Grant
    Filed: May 22, 2019
    Date of Patent: March 24, 2020
    Assignee: CGG SERVICES SAS
    Inventors: Chris Davison, Gordon Poole, Ziqin Yu, Yuan Ni
  • Patent number: 10571587
    Abstract: Wavefield reconstruction may include reconstructing a wavefield at a location away from a seismic receiver based on seismic data sampled from the seismic receiver, a vector of model coefficients comprising a scattering potential, and at least one of a mapping matrix comprising a dictionary of Green's functions and an operator defined by a combination of a number of functions.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: February 25, 2020
    Assignee: PGS Geophysical AS
    Inventor: Paolo Terenghi
  • Patent number: 10564305
    Abstract: Methods for processing seismic data are described. The method includes: obtaining seismic data; solving a series of partial differential wave equations, wherein a first partial differential wave equation describes propagation of a seismic wave going from a first reflector to a second reflector, wherein a second partial differential wave equation describes propagation of a seismic wave going from a second reflector to a third reflector, and wherein a third partial differential wave equation describes propagation of a seismic wave going from a third reflector to a seismic receiver, wherein outputting predicted internal multiples for further imaging or attenuation.
    Type: Grant
    Filed: December 6, 2016
    Date of Patent: February 18, 2020
    Assignee: ConocoPhillips Company
    Inventors: Yu Zhang, Haiyan Zhang
  • Patent number: 10545252
    Abstract: A technique includes receiving seismic data indicative of measurements acquired by seismic sensors. The measurements are associated with a measurement noise. The technique includes estimating at least one characteristic of the measurement noise and deghosting the seismic data based at least in part on the estimated characteristic(s) of the measurement noise.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: January 28, 2020
    Assignee: WESTERNGECO L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Philippe Caprioli, Ali Ozbek, Dirk-Jan Van Manen, Massimiliano Vassallo
  • Patent number: 10436924
    Abstract: Denoising seismic data can include extracting a first plurality of overlapping patches corresponding to a respective seismic data window selected from a plurality of seismic data windows, reshaping the first plurality of overlapping patches into patch vectors, and determining sparse approximations of the patch vectors based on a dictionary and a sparse coefficient vector. Denoising seismic data can also include reshaping the sparse approximations into a respective second plurality of overlapping patches, and constructing a denoised version of at least one of the plurality of seismic data windows using the respective second plurality overlapping patches.
    Type: Grant
    Filed: September 14, 2016
    Date of Patent: October 8, 2019
    Assignee: PGS Geophysical AS
    Inventors: Pierre Turquais, Endrias Asgedom, Walter Franz Söllner
  • Patent number: 10429271
    Abstract: A computer-implemented method for testing a modulation transfer function or spatial frequency response of an imaging system includes, on a computing device, generating a plurality of accumulation cells running along an accumulation line. A boundary delineation divides a first segment of a digital test image captured by the imaging system from a second segment, and the plurality of accumulation cells collectively comprise a one-dimensional accumulation array. For each of the accumulation cells, a projection ray is generated that extends through the accumulation cell and through the digital test image Each accumulation cell is loaded with an accumulated pixel value based on pixel values sampled from each of a plurality of sampling locations along the projection ray. The modulation transfer function or spatial frequency response of the imaging system is derived from the one-dimensional accumulation array.
    Type: Grant
    Filed: May 30, 2017
    Date of Patent: October 1, 2019
    Assignee: MICROSOFT TECHNOLOGY LICENSING, LLC
    Inventor: Stanley T. Birchfield
  • Patent number: 10379245
    Abstract: The current document is directed to computational systems and methods carried out by the computational systems for propagating a combined source-and-receiver wavefield from a first level to a next, second level with respect to depth, time, or another dimension. The methods and systems, to which the current document is directed, apply an efficient complex, combined-source-and-receiver-wavefield propagation operator to a complex combined-source-and-receiver wavefield in order to propagate the complex combined-source-and-receiver wavefield to the next level. Real source and receiver wavefields at the next, second level can then be extracted from the complex combined-source-and-receiver wavefield at the next level.
    Type: Grant
    Filed: November 26, 2013
    Date of Patent: August 13, 2019
    Assignee: PGS Geophysical AS
    Inventor: Naide Pan
  • Patent number: 10324203
    Abstract: A method for a marine seismic survey can include towing streamers that are spaced apart in a cross-line direction by a streamer separation (L) and towing seismic source elements that are spaced apart in the cross-line direction by a source separation based on an integer (k), an inverse of a quantity of the seismic source elements (1/S), and the streamer separation as represented by (k+1/S)L. The seismic source elements can be actuated and seismic signals can be detected at each of a plurality of receivers on the streamers.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: June 18, 2019
    Assignee: PGS Geophysical AS
    Inventor: Andrew Samuel Long
  • Patent number: 10317553
    Abstract: Wavefield separation methods and systems that adjust near-continuous pressure and particle motion wavefields based on distance moved along a vessel track by the sensors when the wavefields were measured are disclosed. Methods and systems correct for the motion of the receivers in towed streamer seismic data in order to obtain a wavefield with approximately stationary-receiver locations. Wavefield separation may then be applied to the wavefield with approximately stationary-receiver locations.
    Type: Grant
    Filed: March 11, 2015
    Date of Patent: June 11, 2019
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Gregg Parkes
  • Patent number: 10310120
    Abstract: Computing systems, methods, and computer-readable media for noise mitigation in seismic multimeasurement data are disclosed.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: June 4, 2019
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Yousif Izzeldin Kamil Amin, Massimiliano Vassallo
  • Patent number: 10302789
    Abstract: In order to use near-field measurements to obtain signature of a signal penetrating seafloor in a shallow water surveyed area, the water-bottom reflections' effect is removed. The removal is performed by obtaining first a far-field initial estimate from stacked primary pulses in the near-field measurements, and then estimating water-bottom reflection portions for different depths using differences between the near-field measurements and the far-field initial estimate. The signature of the air-gun for each shot is then deblended from the near-field measurement for the shot using the one of the water-bottom reflection portions according to a water-bottom depth associated with the shot location.
    Type: Grant
    Filed: March 13, 2015
    Date of Patent: May 28, 2019
    Assignee: CGG SERVICES SAS
    Inventor: Yuan Ni
  • Patent number: 10274627
    Abstract: A seismic sensor system includes a seismic sensor suspended in an acoustic medium, which is disposed between first and second sensor housings. The acoustic medium can be selected to preferentially transmit pressure wave energy, based on the acoustic impedance of the surrounding water column or other seismic medium. The acoustic medium can also be selected to preferentially dissipate or otherwise reduce the transmitted shear wave energy. The second housing can similarly be configured to dissipate shear wave energy, while transmitting pressure wave energy in the form of acoustic waves that propagate through the acoustic medium to the seismic sensor.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: April 30, 2019
    Assignee: ION Geophysical Corporation
    Inventors: Peter Graham Stewart, Cornelis A. M. Faber
  • Patent number: 10228477
    Abstract: Calculating hypocenters of microseismic events. At least some of the example embodiments are methods including: detecting seismic waves from a microseismic event, the detecting by a sensor array disposed on a seafloor, the microseismic event originating in a formation below the sensor array, and the detecting creates received data; separating the received data into up-going data and down-going data, the down-going data indicative of detected seismic waves after a first reflection of the seismic waves at a sea surface; and calculating a hypocenter of the microseismic event using both the up-going data and the first down-going data.
    Type: Grant
    Filed: January 22, 2015
    Date of Patent: March 12, 2019
    Assignee: PGS Geophysical AS
    Inventors: Alexander V. Goertz, Joseph Richardson
  • Patent number: 10228479
    Abstract: Embodiments of dynamic gain adjustments in seismic surveys are described. One method of acquiring a seismic survey includes determining an arrival time at a seismic receiver of a downgoing seismic wavefield associated with a seismic source based at least in part on an estimated position of the seismic source, an estimated position of the seismic receiver, or combinations thereof. The method also includes adjusting a gain of the seismic receiver based at least in part on the determined arrival time of the downgoing seismic wavefield in order to, for example, help prevent overdriving or clipping of the seismic receiver when the downgoing seismic wavefield arrives at or passes by the seismic receiver.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: March 12, 2019
    Assignee: ION Geophysical Corporation
    Inventors: Nikolaos Bernitsas, Carlos Calderon, David Ridyard, David Brookes
  • Patent number: 10222494
    Abstract: Controller and method for adapting a frequency sweep for a vibro-acoustic source element that is configured to generate acoustic waves during a seismic survey. The method includes driving a seismic source element to generate a current frequency sweep; recording seismic data with plural seismic sensors in response to the current frequency sweep; selecting, during the seismic survey, a data subset of the seismic data, wherein the data subset has a size less than 10% of the seismic data; calculating with a processing device an attribute based on the data subset; and calculating a new frequency sweep based on the attribute.
    Type: Grant
    Filed: August 8, 2013
    Date of Patent: March 5, 2019
    Assignee: CGG SERVICES SAS
    Inventors: Benoit Teyssandier, Robert Dowle, Laurent Ruet, John Sallas
  • Patent number: 10156651
    Abstract: Methods and systems to remove source wavefield and source ghost effects from marine seismic data are described. The methods and systems may be used to substantially remove source wavefield and source ghost effects from marine seismic data collected in rough weather conditions.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: December 18, 2018
    Assignee: PGS Geophysical AS
    Inventor: Walter Söllner
  • Patent number: 10107928
    Abstract: A method for removing ocean bottom and/or geology related contamination. The method includes receiving first measurements corresponding to first seismic sensors mounted on a first source array; receiving second measurements corresponding to second seismic sensors mounted away from the first source array; processing the second measurements to determine a contamination model related to the ocean bottom and geology; removing the contamination model from the first measurements to obtain cleaned data; and calculating a source signature of the first source array based on the cleaned data.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: October 23, 2018
    Assignee: CGG SERVICES SAS
    Inventors: Yoong Ern Lee, Chris Davison, Gordon Poole
  • Patent number: 10012745
    Abstract: Method for performing simultaneous encoded-source inversion of geophysical data to estimate parameters of a physical property model (41), especially adapted for surveys without fixed-receiver acquisition geometry, such as marine seismic surveys with moving source and receivers. The encoding functions (32) used on the sources to generate one or more simultaneous encoded-source gathers of data (35), as well as to simulate the same (34), are orthogonal or pseudo-orthogonal with respect to cross-correlation. In addition, receivers are also encoded, with the receiver encoding being designed to make a given receiver less sensitive to sources to which it was not listening during the survey (38). The encoding functions may be temporal bandpass filters differing one from another by central frequency, phase, or both. Efficiency of the method may be further improved by grouping several sources into a super-source, grouping the corresponding gathers into a super-gather, and then applying the above encoding strategy.
    Type: Grant
    Filed: January 23, 2013
    Date of Patent: July 3, 2018
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Jerome R. Krebs, Young Ho Cha, Sunwoong Lee, Pavel Dimitrov, Anoop A. Mullur, Nathan J. Downey, Partha S. Routh
  • Patent number: 9964656
    Abstract: Methods and systems that remove particle-sensor noise from measured vertical-velocity wavefield are presented. A approximate vertical-velocity data is computed from pressure data and vertical-velocity data at receiver coordinates of a seismic data acquisition system. The pressure data is composed of a pressure signal component and pressure-sensor noise and the vertical-velocity data is composed of a vertical-velocity signal component and particle-motion-sensor noise. A filter that gives a minimum difference between the vertical-velocity data and the approximate vertical-velocity data at each receiver coordinate is computed. Vertical-velocity data composed of the vertical-velocity signal component and approximate particle-motion-sensor noise based on the pressure-sensor noise is convolved with the filter at each receiver coordinate.
    Type: Grant
    Filed: May 18, 2015
    Date of Patent: May 8, 2018
    Assignee: PGS Geophysical AS
    Inventors: Okwudili Chuks Orji, Endrias Getachew Asgedom, Walter Söllner
  • Patent number: 9964655
    Abstract: A technique includes determining an image of a subsurface geologic region of interest, where the image represents at least in part ghost energy that is attributable to reflections caused by a reflecting interface. The technique includes deghosting the image, which includes processing data representing the image in a processor-based machine to determine at least one impulse response of a modeling and migration of at least one point scatterer for the region and use the impulse response(s) to attenuate the ghost energy.
    Type: Grant
    Filed: March 25, 2015
    Date of Patent: May 8, 2018
    Assignee: Schlumberger Technology Corporation
    Inventors: Philippe Caprioli, Robin Fletcher, Xiang Du
  • Patent number: 9921325
    Abstract: This disclosure is directed to systems and methods of wavefield separation based on matching operators that represents the relationship between co-located pressure and particle motions sensors. A pressure wavefield and a particle motion wavefield emitted from a subterranean formation are measured using co-located pressure and particle motion sensors located along one or more streamers of a seismic data acquisition system. A matching operator that relates pressure sensor and particle motion sensor responses for co-located pressure and particle motion sensors is computed based on depth of the co-located pressure and particle motion sensors and on the measured pressure and particle motion wavefields. The matching operator and the measured pressure and particle motion wavefields may then be used to compute up-going and down-going wavefields.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: March 20, 2018
    Assignee: PGS Geophysical AS
    Inventors: Stian Hegna, Tilman Kluver
  • Patent number: 9915744
    Abstract: Marine seismic sources for exploring formations under the seafloor using reflection seismology include ghost attenuators for reducing or eliminating ghost signals. Such a ghost attenuator is located in the water above an individual source element and 5 water surface and is configured to dissipate energy of up-going signals and/or to redirect the up-going signals.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: March 13, 2018
    Assignee: CGG SERVICES SAS
    Inventor: Yuan Ni
  • Patent number: 9851463
    Abstract: The present disclosure is related to methods, systems, and machine-readable media for interference attenuation of a residual portion of seismic data, such as may be recorded in a marine seismic survey. Recorded seismic data can be separated into a portion attributed to a source and a residual portion. Seismic interference attenuation can be performed on the residual portion.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: December 26, 2017
    Assignee: PGS Geophysical AS
    Inventors: Rolf H. Baardman, Roald G van Borselen, Steven Fishburn, Alan Ryder
  • Patent number: 9784868
    Abstract: 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.
    Type: Grant
    Filed: June 4, 2014
    Date of Patent: October 10, 2017
    Assignee: CGG SERVICES SAS
    Inventor: Robert Soubaras
  • Patent number: 9696445
    Abstract: Computational systems and methods that combine global frequency-wavenumber-domain (“f-k domain”) filters with localized eigenimage based event selection to generate a resulting wavefield with reduced filter imprints on gather edges, reduced noise, and correct treatment of aliased energy are disclosed. The methods are executed by applying filters to the full set of seismic gather data in the f-k domain in order to obtain a resulting wavefield from recorded pressure and/or particle velocity data. The output of the filter is iteratively decomposed according to local dip values using eigenimage processing based on singular value decomposition (“SVD”). The same sample locations are extracted using SVD from the input in addition to generating input for a subsequent iteration with already processed data removed. Eigenimage processing methods allow for correct treatment of spatially aliased energy in f-k domain filtering.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: July 4, 2017
    Assignee: PGS Geophysical AS
    Inventors: Tilman Kluver, Anthony James Day
  • Patent number: 9625600
    Abstract: Methods and systems for determining and removing swell noise from electric field data collected from streamers towed at different are disclosed. In one aspect, a first set of streamers called upper streamers is towed at a shallow depth, and the second set of streamers called lower streamers is towed below the upper streamers. Receivers located along the streamers measure surrounding electric fields and produce electric field signals. A proportionality parameter is calculated as a function of the electric field signals generated by vertically aligned receivers. The proportionality parameter can be used to calculate an approximate swell noise that is used to remove swell noise from electric field data measured by the receivers.
    Type: Grant
    Filed: December 4, 2012
    Date of Patent: April 18, 2017
    Assignee: PGS Geophysical AS
    Inventors: Robert Juhasz, Peter Lindqvist
  • Patent number: 9619999
    Abstract: A sensor event assessor input/output controller is disclosed. In one embodiment, a multi-channel sensor input configuration provides two-way communication with a plurality of sensors, each of the plurality of sensors having its own channel. An electronic signal receiver receives electronic signals from one or more of the plurality of sensors at a pre-defined sample rate. A signal combiner bundles the electronic signals from one or more of the plurality of sensors into a single electronic signal. A single channel output is used to provide the single electronic signal to the sensor event assessor.
    Type: Grant
    Filed: November 19, 2015
    Date of Patent: April 11, 2017
    Assignee: Broadband Discovery Systems, Inc.
    Inventor: Cory J. Stephanson
  • Patent number: 9594180
    Abstract: Presented are methods and systems for deghosting seismic trace data. A cost function and one or more applicable constraints are selected and used to generate a time-variant deghosting filter. The time-variant deghosting filter can be recalculated for predetermined time intervals over the span of the associated seismic data. The time-variant deghosting filter is then applied to the seismic trace data to attenuate ghosts within the predetermined time interval. A plurality of seismic trace data can be stacked before generating and applying the time-variant deghosting filter.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: March 14, 2017
    Assignee: CGG MARINE (NORWAY) AS
    Inventor: Johan-Fredrik Synnevaag
  • Patent number: 9588244
    Abstract: A method of attenuating interbed multiples in multiply-reflected seismic waves is performed at a computer system, the method including: providing multiple beams of seismic data and an earth model related to a geological volume; selecting one of the beams as an input beam associated with a pair of source and detector located near a top surface of the geological volume; determining at least one of (i) a source-side stationary pegleg arrival and a corresponding detector-side primary beam and (ii) a detector-side stationary pegleg arrival and a corresponding source-side primary beam; predicting an interbed multiples beam using at least one of (i) the detector-side primary beam delayed by the source-side stationary pegleg arrival and (ii) the source-side primary beam delayed by the detector-side stationary pegleg arrival; and deconvolving the predicted interbed multiples beam with the input beam to remove at least a portion of interbed multiples present in the input beam.
    Type: Grant
    Filed: July 25, 2013
    Date of Patent: March 7, 2017
    Assignee: CHEVRON U.S.A. INC.
    Inventors: Tamas Nemeth, Sandra Tegtmeier-Last, N. Ross Hill, Yue Wang, Peeter Akerberg, Shoujian Huang
  • Patent number: 9581711
    Abstract: A method and apparatus for predicting interbed multiples is described herein. Trace geometries may be generated for one or more desired shot-side traces, one or more desired receiver-side traces, and one or more desired interbed multiple generator traces, for a first target trace. A first set of reflections at the interbed multiple generator layer may be extracted from one or more recorded traces closest to the desired interbed multiple generator traces. A second set of reflections below the interbed multiple generator layer may be extracted from one or more recorded traces closest to the desired shot-side traces. A third set of reflections below the interbed multiple generator layer may be extracted from one or more recorded traces closest to the desired receiver-side traces. The interbed multiples for the first target trace may be estimated based on the first set, the second set, and the third set.
    Type: Grant
    Filed: April 23, 2012
    Date of Patent: February 28, 2017
    Assignee: WesternGeco L.L.C.
    Inventors: Paolo Terenghi, William H. Dragoset, Jr., Ian Moore
  • Patent number: 9442209
    Abstract: Computational methods and systems for deghosting marine seismic streamer data are described. In particular, an exploration-seismology vessel tows a number of streamers that form a data acquisition surface located beneath a free surface. The methods computationally deghost or substantially remove receiver ghost signals from seismic data recorded by steamer receivers. The deghosting methods include low frequency compensation to recover vertical velocity wavefield information that is typically lost due to a low signal-to-noise ratio over a low frequency range independent of the free surface conditions or the shape of the data acquisition surface.
    Type: Grant
    Filed: July 10, 2012
    Date of Patent: September 13, 2016
    Assignee: PGS GEOPHYSICAL AS
    Inventors: Walter Söllner, Okwudili Orji, Stian Hegna
  • Patent number: 9442208
    Abstract: Computing device, computer instructions and method for de-ghosting seismic data related to a subsurface. The method may include receiving input seismic data recorded by seismic receivers that located at different depths (zr), generating migration data (du) and mirror migration data (dd) from the input seismic data, deriving a ghost free model (m) based on simultaneously using the migration data (du) and mirror migration data (dd), generating primary (p) and ghost (g) datasets based on the ghost free model (m), simultaneously adaptively subtracting the primary (p) and ghost (g) datasets from the migration data (du) to provide adapted primary (p?1 and p?2) and adapted residual (r?1 and r?2) datasets, and generating a final image (f) of the subsurface based on the adapted primary (p?1 and p?2) and the adapted residual (r?1 and r?2) datasets. In certain embodiments, the input seismic data d includes both hydrophone data and particle motion data.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: September 13, 2016
    Assignee: CGG SERVICES SA
    Inventor: Gordon Poole
  • Patent number: 9405028
    Abstract: Methods, apparatuses, and systems are disclosed for datuming multi-component seismic data. In one example of such a method, a plurality of seismic traces are accessed, the plurality of seismic traces including data representative of amplitude and spatial gradient samples of a seismic wavefield at a plurality of recording locations in a medium. Using a computer-based processing unit, a wavefield propagation from the plurality of recording locations through a medium is initialized, using the amplitude and spatial gradient samples of the seismic wavefield. Seismic traces are generated that correspond to the propagated wavefield at defined locations within the medium.
    Type: Grant
    Filed: February 22, 2013
    Date of Patent: August 2, 2016
    Assignee: ION Geophysical Corporation
    Inventor: Robert Ian Bloor
  • Patent number: 9395457
    Abstract: Computing device, computer instructions and method for directional designature of seismic data d with a given source directivity. The method includes obtaining directional operators r; calculating a model u with a modified source directivity based on (1) seismic data d, and (2) an operator that is a combination of the directional operators r and a reverse transform operator L; using the model u to obtain seismic data dfree with modified source directivity; and generating a final image of the subsurface using seismic data dfree.
    Type: Grant
    Filed: June 26, 2013
    Date of Patent: July 19, 2016
    Assignee: CGG SERVICES SA
    Inventor: Gordon Poole
  • Patent number: 9360576
    Abstract: One embodiment relates to a method for deghosting seismic data from a marine seismic survey. The seismic data from the marine seismic survey is obtained, where the marine seismic survey was performed using multiple sub-sources towed at two or more different depths and fired at distinct time-delays. The seismic data is sorted into common receiver gathers, and the common receiver gathers are transformed from horizontal source coordinates to horizontal wavenumbers. For each selected frequency, a matrix operator is constructed, and an inversion procedure is applied to a system of equations based on the matrix operator to generate source-deghosted seismic data. Other embodiments, aspects and features are also disclosed.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: June 7, 2016
    Assignee: PGS Geophysical AS
    Inventor: Martijn Frijlink
  • Patent number: 9354341
    Abstract: Propagation of wavefields are simulated along paths in a survey environment, where the simulated propagation includes an influence of a reflection at an interface that causes ghost data in measured survey data. Deghosting of the measured survey data is performed using the simulated wavefields.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: May 31, 2016
    Assignee: WesternGeco L.L.C.
    Inventors: Craig J. Beasley, Richard T. Coates
  • Patent number: 9335430
    Abstract: Methods, devices, and computer-readable media are provided for accessing seismic data that describes seismic energy that propagated through media, including water and optionally surface or subsurface layers, to measurement locations in the water. The seismic data includes pressure data that describes time-variant pressures at measurement locations in the water. The seismic data may also include velocity data that describes time-variant velocities of particles at measurement locations in the water. The seismic data is processed using wavefield decomposition to reduce an effect of a portion of the seismic energy that reflects off of the surface of the water. The processing is performed in a discrete domain that includes or is the measurement locations. The discrete domain may exclude certain locations or ranges of locations. The processed seismic data may be used to generate a map of any surfaces of the media through which the seismic energy propagated.
    Type: Grant
    Filed: July 18, 2012
    Date of Patent: May 10, 2016
    Assignee: PGS GEOPHYSICAL AS
    Inventors: Roald G. Van Borselen, Martijn O. Frijlink, Christina D. Riyanti
  • Patent number: 9322943
    Abstract: 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 (d1) and mirror-migrated (d2) gathers based on the seismic data, wherein the migrated and mirror-migrated gathers depend on a feature characterizing a configuration of the seismic system; applying a joint deconvolution model to the migrated and mirror-migrated gathers (d1, d2) to calculate a single deghosted gather (dg); and generating a final image of the subsurface based on the single deghosted gather (dg). The feature is not present in a gather after a step of stacking that is performed prior to generating the final image.
    Type: Grant
    Filed: May 14, 2013
    Date of Patent: April 26, 2016
    Assignee: CGGVERITAS SERVICES SA
    Inventor: Robert Soubaras
  • Patent number: 9291737
    Abstract: Systems and methods for imaging subterranean formations using primary and multiple reflections are described. An exploration-seismology vessel tows a seismic source, a receiver acquisition surface located beneath a free surface, and a source acquisition surface positioned at a depth below the source. The receiver acquisition surface is used to measure pressure and normal velocity wavefields and the source acquisition surface is used to measure direct, down-going, source pressure wavefields generated by the source. The down-going source pressure wavefields in combination with the down-going pressure wavefields and up-going pressure wavefields computed from the pressure and velocity wavefields are used to compute images of the subterranean formation associated with primary reflections and multiple reflections.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: March 22, 2016
    Assignee: PGS GEOPHYSICAL AS
    Inventors: Walter Sollner, Norman Daniel Whitmore, Jr., Stian Hegna, Charles Lameloise, Rune Tonnessen, Gregg Parkes
  • Patent number: 9229123
    Abstract: Rough sea elevation is estimated from a high-frequency portion of recorded pressure data and recorded vertical velocity component data. Generalized deghosting and datuming operators are constructed, which take into account the estimated rough sea elevation and irregular recording depth conditions. A low-frequency portion of the recorded pressure data is decomposed into up-going and down-going wavefields on a horizontal reference plane, using the generalized datuming and deghosting operators. A low-frequency portion of the vertical velocity component data is reconstructed from the decomposed up-going and down-going wavefields on the horizontal reference plane, using the generalized datuming and deghosting operators.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: January 5, 2016
    Assignee: PGS GEOPHYSICAL AS
    Inventor: Naide Pan
  • Patent number: 9217805
    Abstract: A technique includes acquiring particle motion data from a plurality of particle motion sensors while in tow during a seismic survey. During the seismic survey, the particle motion data are processed without deghosting the particle motion data to determine whether at least some portion of the particle motion data is inadequate for an application that relies on the particle motion data.
    Type: Grant
    Filed: October 1, 2010
    Date of Patent: December 22, 2015
    Assignee: WesternGeco L.L.C.
    Inventors: Kenneth E. Welker, Ahmet Kemal Ozdemir, Espen Gulbransen
  • Patent number: 9207349
    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: Grant
    Filed: October 17, 2011
    Date of Patent: December 8, 2015
    Assignee: PGS Geophysical AS
    Inventor: Guillaume Cambois
  • Patent number: 9182512
    Abstract: A technique includes receiving first data indicative of a pressure measurement and measurements of components of a particle motion vector acquired by sensors disposed on at least one cable; and processing the first data to generate second data indicative of a constructed an in-line component of the particle motion vector. The technique includes processing the first and second data in a geophysical processing operation that relies on at least three components of the particle motion vector.
    Type: Grant
    Filed: October 26, 2011
    Date of Patent: November 10, 2015
    Assignee: WESTERNGECO L.L.C.
    Inventors: Nicolas Goujon, Ahmet Kemal Ozdemir, Oeyvind Teigen, Johan O. A. Robertsson
  • Patent number: 9176247
    Abstract: Method for representing seismic data as a spatially varying, second-order tensor field (23). The spatial relationships expressed in these tensors are exploited to link, classify, or separate neighborhoods (22); or to infer global or relational properties among them, thereby suggesting geobodies despite a noisy background. The tensors may be decomposed into their fundamentals that may either be used directly as derivative datasets or attributes, or may be used to facilitate linkage, classification, or separation of neighborhoods or analysis of linkage patterns. Decomposition may be by eigenvalues, with the eigenvalues used to define attributes called ballness, plateness and stickness (24). Alternatively, connections may be made between points in the data where the tensor has been computed, called tokens (21), based on tensor voting and polarity. Or, the connections may be based on a distance measure between tokens.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: November 3, 2015
    Assignee: ExxonMobil Upstream Research Company
    Inventors: Matthias Imhof, Pavel Dimitrov, John P. Kaufhold
  • Patent number: 9134445
    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: Grant
    Filed: January 18, 2010
    Date of Patent: September 15, 2015
    Assignee: Schlumberger Technology Corporation
    Inventors: Julian Edward Kragh, Anthony Curtis, Gabriele Busanello
  • Patent number: 9075162
    Abstract: Seismic data are obtained by recording simultaneously in seismic streamers, acquired by activating approximately simultaneously two or more seismic sources towed at two positions in the vicinity of seismic streamers. A residual is updated iteratively for an inversion solution for the activations of the two or more seismic sources. The iterative updating of the residual utilizes a sequence of overlapping temporal windows containing reflection events and utilizes normal moveout corrections based on largest reflection events in each temporal window. A final updated residual is added to a final updated model result.
    Type: Grant
    Filed: November 10, 2011
    Date of Patent: July 7, 2015
    Assignee: PGS Geophysical AS
    Inventors: Rolf H. Baardman, Roald G. van Borselen
  • Patent number: 9030910
    Abstract: A technique includes representing actual measurements of a seismic wavefield as combinations of an upgoing component of the seismic wavefield and ghost operators. Interpolated and deghosted components of the seismic wavefield are jointly determined based at least in part on the actual measurements and the representation.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: May 12, 2015
    Assignee: Westerngeco L.L.C.
    Inventors: Ali Ozbek, Ahmet Kemal Ozdemir, Massimiliano Vassallo
  • Patent number: 9025413
    Abstract: Seismic data recorded in a marine streamer are obtained, sorted as a common receiver gather. A complex Laplace frequency parameter is used to transform the seismic data from a space-time domain to a spectral domain. An iterative conjugate gradient scheme, using a physically-based preconditioner, is applied to the transformed seismic data, to provide a least squares solution to a normal set of equations for a source deghosting system of equations. The solution is inverse-transformed back to a space-time domain to provide source deghosted seismic data, which is useful for imaging the earth's subsurface.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: May 5, 2015
    Assignee: PGS Geophysical AS
    Inventors: Roald G. van Borselen, Christina D. Riyanti, Christopher P. Page, Jacob T. Fokkema, Peter M. van den Berg