Filtering Or Noise Reduction/removal Patents (Class 702/17)
  • Publication number: 20100312481
    Abstract: A method of processing seismic data including pressure data and pressure gradient data to obtain gradients of moveout corrected pressure data, comprising applying a move-out correction function to the pressure gradient data; and adding a correction term dependent on a moveout corrected time-derivative of the pressure data and a spatial derivative of the moveout correction function. The method may be used prior to any data processing algorithm which uses pressure gradient data in which moveout correction is applied prior to the algorithm, either because the algorithm makes a zero offset assumption or because it is beneficial for the algorithm to operate on moveout corrected data to reduce aliasing.
    Type: Application
    Filed: November 3, 2008
    Publication date: December 9, 2010
    Applicant: WesternGeco LLC
    Inventor: Ian Moore
  • Publication number: 20100302906
    Abstract: Despite full waveform propagation capabilities offered by reverse time migration or inversion, prior art methods can generate spurious events from multiples and therefore are limited to using data without free-surface multiples. By eliminating or largely reducing artificial transmission of multiples, the enhanced reverse time migration or inversion in the present invention can correctly use data that contain free-surface and internal multiples and improve image quality or properties estimation.
    Type: Application
    Filed: May 28, 2009
    Publication date: December 2, 2010
    Inventor: Wei Liu
  • Patent number: 7835867
    Abstract: Techniques are disclosed for determining the bearing from a three-axis geophone to a seismic source, such as a person or other man-made seismic source. In one embodiment, the techniques are implemented as a method that includes receiving outputs from a three-axis geophone (x axis, y axis and z axis outputs), computing a magnitude signal based on the x and y axis outputs, determining locations of each local peak in the magnitude signal, computing a bearing estimate for each peak, and computing a median of the bearing estimates. The resulting median bearing is an estimate of the bearing from the geophone to a target seismic source. In one such case, computing the magnitude signal based on the x and y axis outputs is performed in response to detecting the target seismic source in the phase-shifted z axis output.
    Type: Grant
    Filed: September 16, 2008
    Date of Patent: November 16, 2010
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Michael S. Richman, George Succi
  • Patent number: 7835223
    Abstract: A technique includes obtaining different sets of data, which are provided by seismic sensors that share a tow line in common. Each data set is associated with a different spatial sampling interval. The technique includes processing the different sets of data to generate a signal that is indicative of a seismic event that is detected by the set of towed seismic sensors. The processing includes using the different spatial sampling intervals to at least partially eliminate noise from the signal.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: November 16, 2010
    Assignee: WesternGeco L.L.C.
    Inventor: Nicolas Goujon
  • Publication number: 20100286920
    Abstract: Filters are applied to seismic signals representative of subsurface formations to generate filtered signals with attenuated spatially aliased energy. The filtered signals are multiplied in the frequency-wavenumber domain by a complex function of frequency and wavenumber representing the seismic attribute in the frequency-wavenumber domain, to generate scaled signals. The scaled signals, transformed to the time-space domain, are divided by the filtered signals in the time-space domain, to a seismic attribute useful for identifying and characterizing the subsurface formations.
    Type: Application
    Filed: May 7, 2009
    Publication date: November 11, 2010
    Inventors: Anthony James Day, Tilman Kluver
  • Publication number: 20100286921
    Abstract: Embodiments are directed to systems and methods (200, 300) that enable spatial variability of surface waves to be accounted for in dispersion correction in seismic data processing. This yields superior surface wave noise mitigation, with reduced likelihood of attenuating signal. Embodiments are operative with spatially inhomogeneous media.
    Type: Application
    Filed: January 26, 2009
    Publication date: November 11, 2010
    Inventors: Sunwoong Lee, Warren Ross
  • Publication number: 20100286919
    Abstract: Embodiments use seismic processing methods that account for the spatial variability of surface wave velocities. Embodiments analyze surface wave properties by rapidly characterizing spatial variability of the surface waves in the seismic survey data (302). Filtering criteria are formed using the spatial variability of the surface waves (204). The filtering criteria can then be used to remove at least a portion of the surface waves from the seismic data (206, 319). The rapid characterization involves estimating a local group velocity of the surface waves by cross-correlation of the analytic signals (302).
    Type: Application
    Filed: January 26, 2009
    Publication date: November 11, 2010
    Inventors: Sunwoong Lee, Warren S. Ross
  • Publication number: 20100286922
    Abstract: Method for detecting and/or processing seismic signals, for example acoustic and/or elastic waves, generated by a plurality of seismic and/or acoustic sources and acquired by a plurality of seismic and/or acoustic sensors disposed in/on the subsurface, which provides at least a step in which at least a convolution operation is performed, applied to the seismic signals, having an orientation concordant with the orientation of the time axis, to obtain a signal assimilable to a seismic signal reflected by a reflector element disposed in correspondence with the seismic and/or acoustic sensors of the seismic and/or acoustic sources.
    Type: Application
    Filed: January 9, 2009
    Publication date: November 11, 2010
    Applicant: ISTITUTO NAZIONALE DI OCEANOGRAFIA E DI GEOFISICA SPERIMENTALE - OGS
    Inventor: Flavio Poletto
  • Patent number: 7817061
    Abstract: A method for enhancing downhole telemetry performance comprising enhancing a signal in order to offset signal-to-noise ratio reduction with increasing measured depth, wherein the signal is modified at specified measured depths which are inferred from acoustic wave velocity determination.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: October 19, 2010
    Assignee: XAcT Downhole Telemetry Inc.
    Inventors: Paul L. Camwell, James M. Neff
  • Patent number: 7805247
    Abstract: Systems and methods in which data compression techniques are utilized to fill a predetermined channel capacity are shown. According to one configuration, event data points within test data are selected for communication via the data communication channel and a data decimator is utilized to identify other data points within the test data to fill or substantially fill the predetermined channel capacity. The foregoing data decimator may employ one or more variables for selecting data for communication, wherein one or more of the variables are preferably adjusted in decimator iterations to select an optimum or otherwise desirable subset of data for communication. Data decimators may additionally or alternatively implement a suitable “growth” function to select the particular data for communication and/or the amount of data communicated.
    Type: Grant
    Filed: March 5, 2007
    Date of Patent: September 28, 2010
    Assignee: Schlumberger Technology Corporation
    Inventors: Kai Hsu, Julian J. Pop
  • Patent number: 7805250
    Abstract: Methods and apparatus are provided for generating velocity models for pre-stack depth migration (“PSDM”). Seismic, gravity and electromagnetic joint inversion input data are generated based on observed seismic, gravity and electromagnetic data (e.g., magnetotelluric and/or controlled source electromagnetic), and velocity, density and resistivity models. A joint inversion is performed to produce a multiparametric model that is a function of velocity, density and resistivity parameter distributions. The separate parameter distributions are extracted from the multiparametric model, and the extracted velocity model is used to perform a PSDM. A migration velocity analysis is performed on PSDM output to generate seismic image residuals. If the seismic image residuals meet predetermined quality objectives, the extracted velocity model is output as the final velocity model for PSDM.
    Type: Grant
    Filed: July 27, 2007
    Date of Patent: September 28, 2010
    Assignee: WesternGeco L.L.C.
    Inventors: Daniele Colombo, Michele De Stefano
  • Publication number: 20100228486
    Abstract: The present invention relates to methods for data processing, particularly seismic data represented in three dimensions (3D). A method in accordance with one embodiment of the invention includes identifying extrema points from the 3D seismic data set; removing artificial distortion from 3D seismic data set; generating extrema cubes and derivatives along extrema points; estimating a class number associated with the extrema points; and determining number of classes and dynamically classifying extrema points.
    Type: Application
    Filed: March 6, 2009
    Publication date: September 9, 2010
    Inventors: RenChu Wu, QingRui Li, Gang Fan, Rui Zeng, Min Tang, Dong Wang, YuanYuan Xu
  • Publication number: 20100223012
    Abstract: Coherency analysis, such as semblance scan or stacking amplitude, is used to locate diffractors. Once the diffractors are located, noise energy originating from the diffractors is minimized. Locations of each diffractor are determined by comparing the lateral coherency of the received amplitudes that each assumed diffractor position generates.
    Type: Application
    Filed: May 6, 2010
    Publication date: September 2, 2010
    Inventor: Necati Gulunay
  • Patent number: 7768423
    Abstract: A method whereby a downhole drilling transmission device that communicates to the surface automatically modifies its transmission parameters in order that it substantially improves its ability to adequately communicate with a surface receiver despite increasing signal attenuation between the two as the length of drillpipe increases. This utilizes a simple measure of localized downhole pressure that then relies upon a look-up table or similar that provides a correspondence between said pressure and measured depth. Such a look-up table or similar can be readily built by incorporating appropriate features of the planned well such as drilling fluid flow rate, drilling fluid density, drilling fluid viscosity, well profile, bottom hole assembly component geometry, drillpipe geometry, and indications as to whether the fluid is flowing or stationary.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: August 3, 2010
    Assignee: XAct Dowhole Telemetry Inc.
    Inventors: Paul L. Camwell, James M. Neff
  • Patent number: 7761237
    Abstract: This patent delineates methods for quantifying and mitigating dip-induced azimuthal AVO effects in seismic fracture detection using Azimuthal AVO analysis by accurately accounting for the divergence correction and azimuthal dependence of the reflection angle. Solutions are provided for three cases: (1) dipping isotropic reservoirs; (2) anisotropic reservoirs with fractures aligned in arbitrary direction; and (3) anisotropic reservoirs where vertical fractures are aligned perpendicular to the dip direction.
    Type: Grant
    Filed: October 14, 2005
    Date of Patent: July 20, 2010
    Assignee: ExxonMobil Upstream Research Co.
    Inventors: Wenjie Dong, Chih-Ping Lu
  • Publication number: 20100161234
    Abstract: A method and system for processing synchronous array seismic data includes acquiring synchronous passive seismic data from a plurality of sensors to obtain synchronized array measurements. A reverse-time data process is applied to the synchronized array measurements to obtain a plurality of dynamic particle parameters associated with subsurface locations. These dynamic particle parameters are stored in a form for display. Maximum values of the dynamic particle parameters may be interpreted as reservoir locations. The dynamic particle parameters may be particle displacement values, particle velocity values, particle acceleration values or particle pressure values. The sensors may be three-component sensors. Zero-phase frequency filtering of different ranges of interest may be applied. The data may be resampled to facilitate efficient data processing.
    Type: Application
    Filed: March 9, 2010
    Publication date: June 24, 2010
    Applicant: Spectraseis AG
    Inventors: Erik Saenger, Brian Steiner, Stefan Schmalholz
  • Publication number: 20100161233
    Abstract: A method and system for processing synchronous array seismic data includes acquiring synchronous passive seismic data from a plurality of sensors to obtain synchronized array measurements. A reverse-time data process is applied to the synchronized array measurements to obtain a plurality of dynamic particle parameters associated with subsurface locations. These dynamic particle parameters are stored in a form for display. Maximum values of the dynamic particle parameters may be interpreted as reservoir locations. The dynamic particle parameters may be particle displacement values, particle velocity values, particle acceleration values or particle pressure values. The sensors may be three-component sensors. Zero-phase frequency filtering of different ranges of interest may be applied. The data may be resampled to facilitate efficient data processing.
    Type: Application
    Filed: March 7, 2010
    Publication date: June 24, 2010
    Applicant: Spectraseis AG
    Inventors: Erik Saenger, Brian Stainer, Stefan Schmalholz
  • Publication number: 20100161235
    Abstract: We here disclose methods of imaging multishot data without decoding. The end products of seismic data acquisition and processing are images of the subsurface. When seismic data are acquired based on the concept of multishooting (i.e., several seismic sources are exploited simultaneously or near simultaneously and the resulting pressure changes or ground motions are recorded simultaneously there are two possible ways to obtain images of the subsurface. One way consists of decoding multishot data before imaging them that is the multishot data are first converted to a new dataset corresponding to the standard acquisition technique in which one single shot at a time is generated and acquired and then second imaging algorithms are applied to the new dataset. Actually all seismic data processing packages available today require that multishot data be decoded before imaging them because they all assume that data have been collected sequentially.
    Type: Application
    Filed: December 17, 2007
    Publication date: June 24, 2010
    Inventor: Luc T. Ikelle
  • Patent number: 7742876
    Abstract: It is described a method for spatially filtering 3D seabed seismic data acquired in a cross-line geometry including methods of how to decompose the data using a filter with two spatial components.
    Type: Grant
    Filed: March 29, 2005
    Date of Patent: June 22, 2010
    Assignee: WesternGeco L.L.C.
    Inventor: Johan Olof Anders Robertsson
  • Publication number: 20100153015
    Abstract: A method and system of detecting and mapping a subsurface hydrocarbon reservoir includes determining ratio data for a plurality of orthogonal spectral components of naturally occurring low frequency background seismic data. The ratio data may be compared, plotted, contoured and displayed as a subsurface hydrocarbon reservoir map or a hydrocarbon potential map. The ratio data may represent a vertical spectral component of the seismic data over a horizontal spectral component of the seismic data. The subsurface hydrocarbon reservoir map may include contouring the ratio data over a geographical area associated with the seismic data.
    Type: Application
    Filed: February 23, 2010
    Publication date: June 17, 2010
    Applicant: Spectraseis AG
    Inventors: Yuri Podladchikov, Marc-André Lambert, Rodolphe Dewarrat, Stefan Schmalholz
  • Patent number: 7725266
    Abstract: According to a first preferred aspect of the instant invention, there is provided an efficient method of computing a 3D frequency domain waveform inversion based on 3D time domain modeling. In the preferred arrangement, 3D frequency domain wavefields are computed using 3D time-domain modeling and a discrete Fourier transformation that is preferably computed “on the fly” instead of solving the large systems of linear equations that have traditionally been required by direct frequency domain modeling. The instant invention makes use of the theory of gradient-based waveform inversion that estimates model parameters (for example velocities) by matching modeled data to field data sets. Preferably the modeled data are calculated using a forward modeling algorithm.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: May 25, 2010
    Assignee: BP Corporation North America Inc.
    Inventors: Laurent Sirgue, John T. Etgen, Uwe Albertin, Sverre Brandsberg-Dahl
  • Publication number: 20100124148
    Abstract: A method for determining upgoing pressure components of seismic signals from signals detected by combined pressure responsive sensors and motion responsive seismic sensors disposed in a plurality of laterally spaced apart streamers includes determining a threshold time at which angle of incidence error in the motion responsive signals in the cross-line direction falls below a selected threshold. Below the threshold time, the motion responsive signals are corrected for angle of incidence in the in-line and cross-line directions. Above the threshold time, the motion responsive signals are corrected for angle of incidence only in the in-line direction. Both sets of incidence corrected measured motion responsive signals, and the pressure responsive signals are used to determine upgoing or downgoing pressure components or upgoing or downgoing motion components of the measured motion responsive and pressure responsive seismic signals.
    Type: Application
    Filed: November 14, 2008
    Publication date: May 20, 2010
    Inventors: Tilman Kluver, Hocine Tabti, Anthony James Day
  • Patent number: 7720609
    Abstract: A method of assessing acquisition errors in seismic images in a seismic data volume. The method includes selecting a seismic attribute in a seismic data volume and then stacking seismic quality image measurements taken along the selected attribute. The stacked measurements are then related on the basis of any vertical correlation and any vertically correlated feature is identified as a cobweb. Any identified cobwebs are removed from the seismic data volume.
    Type: Grant
    Filed: January 10, 2006
    Date of Patent: May 18, 2010
    Assignee: Statoil ASA
    Inventor: Paul Meldahl
  • Patent number: 7720607
    Abstract: Method for processing a set of seismic cubes corresponding to the same acquisition zone and at different source/receiver offset and/or angle of incidence values, characterized in that at least one seismic cube is determined, which is an estimation of the component common to at least two seismic cubes corresponding to different offset and/or angle of incidence values.
    Type: Grant
    Filed: April 28, 2004
    Date of Patent: May 18, 2010
    Assignee: CGGVeritas Services SA
    Inventors: Didier Lecerf, Thierry Coleou
  • Patent number: 7715986
    Abstract: The present invention incorporates the use of model-driven and data-driven methodologies to attenuate multiples in seismic data utilizing a prediction model which includes multiply-reflected, surface-related seismic waves. The present invention includes beam techniques and convolving a predicted multiples beam with a segment of a modeled pegleg beam to obtain a convolved multiples beam. The convolved multiples beam can then he deconvolved to attenuate the multiples that are present in the original input beam.
    Type: Grant
    Filed: May 22, 2007
    Date of Patent: May 11, 2010
    Assignee: Chevron U.S.A. Inc.
    Inventors: Tamas Nemeth, Yue Wang, Fuhao Qin, Ross Hill
  • Patent number: 7714714
    Abstract: Certain embodiments of the present invention provide a system for improved signal processing within a remote sensor system. The system includes a detection component and a classification component. The detection component is adapted to detect an event. The classification component is adapted to classify the event based at least in part on a situation. Certain embodiments of the present invention provide a method for improved signal processing within a remote sensor system. The system includes determining a situation, detecting an event, and classifying the event based at least in part on a situation.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: May 11, 2010
    Assignee: Harris Corporation
    Inventors: Paul Edward Voglewede, Scott J. Cloutier, Michael D. Jordan
  • Patent number: 7715988
    Abstract: A technique includes obtaining particle motion data and pressure data that are acquired by seismic sensors while in tow. The sensors are part of a plurality of streamers, and the pressure and particle motion data contain surface ghosts. The technique includes processing the particle motion data and the pressure data to generate a data set that is indicative of a pressure wavefield at positions between the streamers and is substantially free of the surface ghosts.
    Type: Grant
    Filed: June 13, 2007
    Date of Patent: May 11, 2010
    Assignee: WesternGeco L.L.C.
    Inventors: Johan Olof Anders Robertsson, Philippe Caprioli, Ahmet Kemal Ozdemir
  • Publication number: 20100114495
    Abstract: Seismic image filtering machines, systems, program products, and computer implemented methods are provided to generate a filtered seismic image responsive to filtered seismic image data generated by attenuating coherent seismic noise from surface waves of an unfiltered wavefield constructed from unfiltered seismic image data through a single downward extrapolation of the unfiltered wavefield using a plurality of nonstationary convolution operators to perform localized filtering at each of a plurality of spatial locations of the unfiltered wavefield. Various embodiments, for example, can beneficially handle strong lateral velocity variations thus making various embodiments effective tools to remove complicated coherent seismic noise which is typically in the form of exponentially decaying evanescent waves.
    Type: Application
    Filed: October 29, 2009
    Publication date: May 6, 2010
    Applicant: Saudi Arabian Oil Company
    Inventor: Saleh M. Al-Saleh
  • Patent number: 7710265
    Abstract: Certain embodiments of the present invention provide a system for improved signal processing within a remote sensor system. The system includes a detection component and a processing component. The detection component is adapted to detect an event and generate a signal based at least in part on the event. The processing component adapted to process a signal based at least in part on a situation. Certain embodiments of the present invention provide a method for improved signal processing within a remote sensor system. The method includes determining a situation, detecting an event, generating a signal based at least in part on the event, and processing the signal based at least in part on the situational parameter.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: May 4, 2010
    Assignee: Harris Corporation
    Inventors: Paul Edward Voglewede, Scott J. Cloutier, Michael D. Jordan
  • Patent number: 7710264
    Abstract: Certain embodiments of the present invention provide a system for improved signal processing within a remote sensor system. The system includes a detection component and a processing component. The detection component is adapted to detect an event and generate a signal based at least in part on the event. The processing component adapted to determine an envelope of the signal based at least in part on a situation. Certain embodiments of the present invention provide a method for improved signal processing within a remote sensor system. The system includes detecting an event, generating a signal based at least in part on the event, and determining an envelope of the signal based at least in part on a situation.
    Type: Grant
    Filed: November 7, 2006
    Date of Patent: May 4, 2010
    Assignee: Harris Corporation
    Inventors: Paul Edward Voglewede, Scott J. Cloutier, Michael D. Jordan
  • Patent number: 7702463
    Abstract: Systems and methods for enhancing the resolution of a seismic data image displayed on a face of a sampling probe. The enhanced image represents a maximum resolution of at least a portion of the seismic data image. The seismic data image is enhanced by extracting seismic data that are perpendicular to a reflection surface that is closest to a center of the sampling probe and positioning the extracted seismic data in a visible planar face of the sampling probe.
    Type: Grant
    Filed: December 12, 2007
    Date of Patent: April 20, 2010
    Assignee: Landmark Graphics Corporation, a Halliburton Company
    Inventor: Stewart A. Levin
  • Publication number: 20100074051
    Abstract: A method for estimating seismic data from sources of noise in the earth surrounding a first seismic receiver and a second seismic receiver. The method includes calculating a Green's function G?(X1, X2) between a first seismic receiver X1 and a second seismic receiver X2 using interferometry. The first seismic receiver X1 is located at a distance away from the second seismic receiver X2. After calculating the Green's function G?(X1, X2), the method may include steps for determining an estimate of one or more non-physical wavefields present in the Green's function G?(X1, X2) and determining a filter to remove the non-physical wavefields from the Green's function G?(X1, X2) based on the estimate of the non-physical wavefields. The filter may then be applied to the Green's function G?(X1, X2) to obtain a Green's function G?(X1, X2) free of non-physical wavefields.
    Type: Application
    Filed: August 5, 2009
    Publication date: March 25, 2010
    Inventors: David Fraser Halliday, Andrew Curtis
  • Publication number: 20100070183
    Abstract: Techniques are disclosed for determining the bearing from a three-axis geophone to a seismic source, such as a person or other man-made seismic source. In one embodiment, the techniques are implemented as a method that includes receiving outputs from a three-axis geophone (x axis, y axis and z axis outputs), computing a magnitude signal based on the x and y axis outputs, determining locations of each local peak in the magnitude signal, computing a bearing estimate for each peak, and computing a median of the bearing estimates. The resulting median bearing is an estimate of the bearing from the geophone to a target seismic source. In one such case, computing the magnitude signal based on the x and y axis outputs is performed in response to detecting the target seismic source in the phase-shifted z axis output.
    Type: Application
    Filed: September 16, 2008
    Publication date: March 18, 2010
    Applicant: BAE SYSTEMS Information and Electronic Systems Integration Inc.
    Inventors: Michael S. Richman, George Succi
  • Patent number: 7680600
    Abstract: A method for data processing includes transforming measurement data acquired in the time domain during an oilfield operation into a second domain to produce transformed data; identifying distortions in the transformed data; removing the distortions from the transformed data; and transforming back from the second domain to the time domain to produce cleaned-up data. The transforming measurement data may use a Fourier transform or a wavelet transform. The method may further include compressing the cleaned-up data or reconstructing signals from the cleaned-up data. A method for data processing includes decomposing measurement data, which are acquired in an oilfield operation, using a low pass filter to produce a first dataset; decomposing the measurement data using a high pass filter to produce a second dataset; removing distortions from the second dataset to yield a corrected second dataset; and reconstructing a corrected dataset from the first dataset and the corrected second dataset.
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: March 16, 2010
    Assignee: Schlumberger Technology Corporation
    Inventors: Andrew Carnegie, Kai Hsu, Julian Pop
  • Patent number: 7676327
    Abstract: A technique for decomposing a recorded wave field represented in a set of multicomponent, marine seismic data centers around a computer-implemented method including: estimating the statistics of the noise terms in each one of a predetermined group of seismic measurements in a seismic data set acquired in a marine survey; modeling the physical propagation of a recorded wave field represented in the seismic data set from the estimated statistics; and estimating a directional component of the recorded wave field from the physical propagation model that minimizes error relative to the seismic measurements.
    Type: Grant
    Filed: April 26, 2007
    Date of Patent: March 9, 2010
    Assignee: WesternGeco L.L.C.
    Inventors: Ahmet Kemal Ozdemir, Ali Ozbek
  • Patent number: 7664603
    Abstract: A method of analyzing an electromagnetic wavefield includes the steps of measuring the electric and magnetic fields at at least one receiver, formulating a respective spatial domain filter in respect of each of mutually orthogonal components of each of the electric and magnetic fields, and applying the filters to the measured acquired data to decompose the wavefield into upgoing and downgoing components.
    Type: Grant
    Filed: April 1, 2005
    Date of Patent: February 16, 2010
    Assignee: Statoil ASA
    Inventors: Tage Røsten, Lasse Amundsen
  • Patent number: 7664602
    Abstract: A method for the quantitative characterization of a seabed sediment composition and a seabed's layered subbottom structure from at least one normal-incidence, single-channel reflection acoustic amplitude time series seismogram is disclosed. The method detects a plurality of reflections from subbottom interfaces in said seismograms, determines the traveltime, the polarity and the reflectivity of each detected reflection, determines the intrinsic attenuation of the sediment layer between pairs of adjacent reflections, and determines the acoustic properties, layer thicknesses and material properties of the seabed's layered subbottom structure as a function of said traveltimes, polarities and reflectivities of the detected reflections and said intrinsic attenuation of the sediment layer between pairs of adjacent reflections. A forward model describing the physical relationship between the material properties and the acoustic properties of seabed sediments is also disclosed.
    Type: Grant
    Filed: February 23, 2007
    Date of Patent: February 16, 2010
    Assignee: National University of Ireland, Galway
    Inventors: Klaus Christian Leurer, Colin Brown
  • Patent number: 7660202
    Abstract: A method for generating an average gamma factor for recorded PS data and recorded PP data. The method includes mapping one or more arrival times of the recorded PS data onto one or more expected arrival times of the recorded PP data using an estimated average gamma factor, identifying one or more corresponding pairs of events in the recorded PS data and the recorded PP data using forward modeling, applying geophysical reasoning on the corresponding pairs of events and generating the average gamma factor.
    Type: Grant
    Filed: October 11, 2005
    Date of Patent: February 9, 2010
    Assignee: WesternGeco L.L.C.
    Inventors: Keshan Zou, Jianchun Dai, Haibin Xu, Andrew E. Hannan, Adam P. Koesoemadinata
  • Patent number: 7660483
    Abstract: One embodiment of the present invention provides a system that removes noise from an image. During operation, the system first identifies blobs in the image, wherein a blob is a set of contiguous pixels which possibly represents a character or a portion of a character in the image. Next, the system analyzes the blobs to dynamically determine a “noise threshold” for the blobs. The system then removes blobs from the image which are below the noise threshold.
    Type: Grant
    Filed: November 30, 2005
    Date of Patent: February 9, 2010
    Assignee: Adobe Systems, Incorporated
    Inventor: Dennis G. Nicholson
  • Publication number: 20090323469
    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: Application
    Filed: June 30, 2008
    Publication date: December 31, 2009
    Inventor: CRAIG J. BEASLEY
  • Patent number: 7639564
    Abstract: Methods and apparatus for removing noise from signal traces collected during a seismic gather, particularly removing the aliased energy in the time-slowness (tau-P) domain so that aliasing noise does not lead to high noise levels in the inverse transformed data are provided. Removal of the aliasing noise may provide for quieter seismic traces and may increase the likelihood for successful three-dimensional (3-D) tau-P interpolation and detection of seismic events.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: December 29, 2009
    Assignee: Fairfield Industries Incorporated
    Inventors: Josef Paffenholz, Kenneth L. Craft
  • Publication number: 20090299639
    Abstract: A method for processing seismic data. The method may include splitting the seismic data into multiple datasets according to one or more offsets; determining a first shift amount in three or more dimensions of the seismic data between a dataset having a first offset and a dataset having a second offset, determining a second shift amount in the three or more dimensions between the dataset having the second offset and a dataset having a third offset, determining a cumulative shift amount based on a shift of the first shift amount and the second shift amount and determining a corrected dataset based on the dataset having the third offset and the cumulative shift amount.
    Type: Application
    Filed: June 2, 2008
    Publication date: December 3, 2009
    Inventors: VICTOR AARRE, PATRICK SMITH
  • Patent number: 7627431
    Abstract: Method of processing seismic data corresponding to acquisitions carried out in a medium exhibiting azimuthal anisotropy, characterized in that for two sets of data corresponding, for one and the same seismic variable and for one and the same ground zone, to at least two different source/azimuth receiver pair sectors, an average between the data which correspond to the azimuth considered and data which correspond, for the same variable and the same ground zone, to a perpendicular azimuth sector is determined for each of the azimuths considered, and in that an estimate of the part common to the two sets thus obtained of averaged data is determined.
    Type: Grant
    Filed: April 23, 2004
    Date of Patent: December 1, 2009
    Assignee: Compagnie Generale de Geophysique
    Inventors: Erika Angerer, Didier Lecerf, Pierre Lanfranchi
  • Patent number: 7627433
    Abstract: Method for controlling the phase spectrum of seismic data to match assumptions inherent in subsequent processing steps. The source signature, after processing with the same initial processing steps used on the data, is used to design a phase control filter that shapes the seismic data to have a minimum phase spectrum or whatever other phase spectrum the subsequent processing algorithms may assume. The processed data is then filtered with a second phase-control filter, also designed using the parallel-processed signature, to shape the data to zero phase or whatever other phase may be desired for interpretation of the data.
    Type: Grant
    Filed: May 20, 2004
    Date of Patent: December 1, 2009
    Assignee: Exxon Mobil Upstream Research Company
    Inventors: Richard E. Duren, Andrew P. Shatilo, Mohamed T. Hadidi
  • Publication number: 20090290449
    Abstract: To process seismic data, a combined four-dimensional (4D) binning and regularization procedure is performed on the seismic data, where the combined 4D binning and regularization procedure includes computing measures associated with regularization of the seismic data, computing measures associated with 4D binning, and processing the seismic data according to the regularization measures and 4D binning measures.
    Type: Application
    Filed: May 25, 2008
    Publication date: November 26, 2009
    Inventors: Patrick J. Smith, Anthony D. Curtis
  • Publication number: 20090281732
    Abstract: A calculated vertical velocity sensor signal is determined from a recorded pressure sensor signal. A constructed vertical velocity sensor signal is determined as a linear combination of the calculated vertical velocity sensor signal and a recorded vertical velocity sensor signal in dual-sensor seismic streamer data, using a mixture coefficient as a proportionality constant. An upgoing pressure wavefield component is determined as one half of a difference of the recorded pressure sensor signal and the constructed vertical velocity sensor signal, as a function of the mixture coefficient. An error in the upgoing pressure wavefield component is determined by propagating errors in the recorded pressure sensor signal and constructed vertical velocity sensor signal terms. A value of the mixture coefficient is determined that minimizes the error in the upgoing pressure wavefield component.
    Type: Application
    Filed: May 7, 2008
    Publication date: November 12, 2009
    Inventor: Neil Turnbull
  • Patent number: 7616524
    Abstract: A wavelet-based method for improving the quality of seismic data utilizing the intercept determined by applying least squares regression to the wavelet transform of a seismic trace. The intercept is calculated for every time point of the wavelet transform for each seismic trace. The intercepts are then plotted versus time or depth. These plots are used in place of seismic traces themselves to create two dimensional and three dimensional seismic section images. In one embodiment, the real and imaginary portions of the selected wavelet transform are weighted to generate a finer representation of the intercept. In another embodiment, a minimum amplitude value is utilized to establish a noise floor, thus stabilizing the regression calculation. In yet another embodiment, a taper of the amplitude is applied to wavelet enhance the resolving power of the wavelet.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: November 10, 2009
    Assignees: The University of Tulsa, Fairfield Industries, Incorporated
    Inventor: Adam Gersztenkorn
  • Publication number: 20090276159
    Abstract: Seismic data collected by a group of seismic receivers is received, and properties of coherent noise for plural modes of the coherent noise based on the received seismic data are computed to produce a model of the coherent noise for the plural modes. Using the model, the coherent noise is simulated to generate a synthetic noise.
    Type: Application
    Filed: April 30, 2008
    Publication date: November 5, 2009
    Inventor: CLAUDIO L. STROBBIA
  • Patent number: 7603238
    Abstract: A method for acquiring and analyzing time-series data using singularities is described. This method allows for the analysis of data over a wide spectrum of frequencies. Once the data is acquired in an oil field, singularities of the data are extracted; and the extracted singularities are utilized to interpret the formation properties related to the data.
    Type: Grant
    Filed: October 4, 2007
    Date of Patent: October 13, 2009
    Assignee: Schlumberger Technology Corporation
    Inventors: Henri-Pierre Valero, Shu-Kong Chang, Jean-Marie Degrange, Vivian Pisre, Karan Singh
  • Patent number: 7599798
    Abstract: A subterranean structure is characterized using composite seismic response data received from a plurality of sources. Phase encoding is applied to the data in which phase shifts are selected based on frequency variation of noise terms. The phase-encoded data is then migrated and a representation of the subterranean structure is produced according to the migrating.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: October 6, 2009
    Assignee: WesternGeco L.L.C.
    Inventors: Craig J. Beasley, Phil Kitchenside, Nicolae Moldoveanu