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| Number | Title | Issue Date |
| 7963332 | Apparatus and method for abrasive jet perforating A abrasive jet perforating tool comprises a generally cylindrically shaped tube with a side, an upper portion, and a lower portion; a plurality of holes tapped and threaded into the side of the tube; threaded abrasive jets mounted in at least some of the plurality o... | 06/21/2011 |
| 7929373 | Method of wavefield extrapolation for single-station, dual-sensor towed streamer signals A time-dependent arrival angle is determined at a single receiver station in a towed streamer. Up-going and down-going pressure wavefields are calculated from pressure and vertical particle velocity wavefields measured at the receiver station. Extrapolated up-going ... | 04/19/2011 |
| 7872942 | Method for imaging a sea-surface reflector from towed dual-sensor streamer data A pressure wavefield and a normal velocity wavefield measured on a smoothly shaped acquisition surface by towed dual-sensor marine seismic streamers are decomposed into up-going and down-going pressure and particle velocity components on an observation level between... | 01/18/2011 |
| 7835225 | Method for attenuating particle motion sensor noise in dual sensor towed marine seismic streamers Signals detected by particle motion sensors in a towed dual sensor marine seismic streamer are scaled to match signals detected by pressure sensors in the streamer. The pressure sensor signals and the scaled particle motion sensor signals are combined to generate up... | 11/16/2010 |
| 7830747 | Method for multi-azimuth prestack time migration for general heterogeneous, anisotropic media Three data subsets are obtained in three selected azimuthal directions from seismic data in heterogeneous, anisotropic media. Azimuthal velocities are determined for each of the data subsets. A linear system of equations in the three selected azimuthal directions an... | 11/09/2010 |
| 7768869 | Method for deghosting and water layer multiple reflection attenuation in marine seismic data A method is disclosed for deghosting and water surface multiple reflection attenuation in marine seismic data. The method includes decomposing data acquired at two water depths with sensors that measure the same parameter into upgoing and downgoing wavefield compone... | 08/03/2010 |
| 7751277 | Method for interpolating seismic data by anti-alias, anti-leakage Fourier transform An estimated frequency-wavenumber spectrum is generated by applying a first Anti-leakage Fourier transform method to unaliased frequency components in temporal-transformed seismic data and applying a second Anti-leakage Fourier transform method to aliased frequency ... | 07/06/2010 |
| 7733741 | Method for reducing 3-D migration operator to 2-D migration operator for inhomogeneous media Time slices of seismic data are transformed from rectangular space-time domain to cylindrical space-time domain. 2-D seismic migration is performed on the transformed data for each radial direction. Slices of the migrated data are inverse transformed back to the rec... | 06/08/2010 |
| 7684281 | System for combining signals of pressure sensors and particle motion sensors in marine seismic streamers Signals of pressure sensors and particle motion sensors located in marine seismic streamers are combined to generate a seismic wavefield. At least a part of the particle motion sensor signal is calculated from a recorded pressure signal and the calculated at least a... | 03/23/2010 |
| 7646672 | Method for wavefield separation in 3D dual sensor towed streamer data with aliased energy in cross-streamer direction Pressure records and vertical particle velocity records from dual sensor towed streamer data are transformed to the inline wavenumber domain. A series of scaling filters are applied to the transformed vertical particle velocity records at each inline wavenumber, whe... | 01/12/2010 |
| 7646671 | Method for processing marine towed streamer seismic data from regular multi-azimuth surveys Marine towed streamer seismic data are combined from a first survey and a second survey, wherein the first survey and the second survey are shot with a bin size of L×L and the second survey is shot with a shooting direction rotated 90° relative to the shooting dir... | 01/12/2010 |
| 7539079 | System and method for determining positions of towed marine source-array elements A system comprises a plurality of seismic transmitters, at least one seismic source array, and a processor. Each seismic source array comprises a plurality of seismic source-array elements, mounted within the seismic source array; and a plurality of near-field senso... | 05/26/2009 |
| 7505361 | Method for prediction of surface related multiples from marine towed dual sensor seismic streamer data Particle motion sensor signals and the pressure sensor signals data from a towed marine seismic streamer are combined to generate an up-going pressure wavefield component and a down-going particle motion wavefield component. The down-going particle motion wavefield ... | 03/17/2009 |
| 7376045 | System and method for determining positions of towed marine seismic streamers A system comprises a plurality of acoustic transmitters, mounted inside the streamers, adapted to transmit broadband signals having low cross-correlation between the signals of different transmitters; a plurality of acoustic receivers, mounted inside the streamers, ... | 05/20/2008 |
| 7359283 | System for combining signals of pressure sensors and particle motion sensors in marine seismic streamers Signals of pressure sensors and particle motion sensors located in marine seismic streamers are combined to generate pressure sensor data and particle motion data with substantially the same broad bandwidth. The noisy low frequency part of the motion signals are cal... | 04/15/2008 |
| 7336560 | Method for determination of sufficient acquisition coverage for a marine seismic streamer survey Seismic data sets representative of a marine seismic streamer survey are constructed with test coverage holes in the data sets. The data sets are processed and data quality degradation in the processed data due to the test coverage holes is evaluated. Maximum accept... | 02/26/2008 |
| 7286690 | Method for imaging of pre-stack seismic data Prestack seismic data is imaged by calculating an individual reflectivity for each frequency in the seismic data. Then, a mean reflectivity is calculating over the individual reflectivities. A variance is calculated for the set of reflectivities versus frequency. A ... | 10/23/2007 |
| 7218572 | Method of seismic source monitoring using modeled source signatures with calibration functions Physical parameters are measured for an array of seismic sources, preferably for each activation of the seismic sources. Calibration functions are obtained and the measured physical parameters and calibration functions are applied to a model, which generates a calib... | 05/15/2007 |
| 7167412 | Apparatus for steering a marine seismic streamer via controlled bending A marine seismic streamer steering device comprises at least two hinged sections pivotally coupled to each other and connected between two adjacent sections of the seismic streamer, and a bend control unit that controls bending of the hinged sections relative to the... | 01/23/2007 |
| 7123543 | Method for seismic exploration utilizing motion sensor and pressure sensor data A method is disclosed for deghosting seismic data. The data include measurements of a vertical component of particle motion and pressure. The measurements are substantially collocated and made at a plurality of spaced apart positions. The method includes transformin... | 10/17/2006 |
| 7039525 | Method for seismic migration using explicit depth extrapolation operators with dynamically variable operator length Explicit depth extrapolation operators are constructed with variable operator lengths depending on maximum dip angle, accuracy condition, and wavenumber. Operator tables are then constructed using the explicit depth extrapolation operators. In a further embodiment, ... | 05/02/2006 |
| 7039526 | Method for downward extrapolation of pre-stack seismic data A set of pre-stack seismic data is downward extrapolated, by first determining a migration interval in the seismic data set. A maximum error criterion is selected for the migration interval. A maximum relative error in phase calculated as a function of frequency, pr... | 05/02/2006 |
| 7035737 | Method for seismic wavefield extrapolation A seismic wavefield is extrapolated using variable extrapolation step size and then phase-shifted linear interpolation is applied to the extrapolated wavefield. ... | 04/25/2006 |
| 6925386 | Illumination monitoring process for making infill decisions In a seismic survey, idealized subsurface illumination is generated using idealized survey data. Then, the following three steps are performed during each of a sequence of time intervals during the seismic survey. First, an incremental portion of actual survey data ... | 08/02/2005 |
| 6889142 | Method of correcting for time shifts in seismic data resulting from azimuthal variation A seismic data set is processed by applying a transform to the seismic data set that corrects for time shifts in the seismic data set resulting from azimuthal variation. Alternatively, a seismic data set is sorted to common offset gathers. Then, the following steps ... | 05/03/2005 |
| 6763304 | Method for processing seismic data to attenuate multiples A seismic data set is processed by selecting a set of gathers in the seismic data set. A frequency independent constraint matrix is calculated in a first gather. A model solution in at least one second gather is calculated by using the constraint matrix in a high-re... | 07/13/2004 |
| 6757217 | Method for time-aligning multiple offset seismic data volumes Near-offset and far-offset seismic data volumes are time-aligned by first selecting a plurality of time shifts. The near-offset and far-offset seismic data volumes are cross-correlated at the plurality of time shifts. An initial time-shift volume and a maximum corre... | 06/29/2004 |
| 6691075 | Method for modeling seismic acquisition footprints A model seismic image of a subsurface seismic reflector is constructed, wherein a set of source and receiver pairs is located, and a subsurface velocity function is determined. Specular reflection points are determined on the subsurface seismic reflector ... | 02/10/2004 |
| 6516275 | Method for spectral balancing of near- and far-offset seismic data A method for spectral balancing of near- and far-offset seismic data, whereby velocity and offsets are determined for the seismic data. First, an NMO stretch compensation filter is created by the following steps. A frequency spectrum of the near-offset se... | 02/04/2003 |
| 6490526 | Method for characterization of multi-scale geometric attributes A multi-trace geometric attribute of a regularly gridded surface is calculated at multiple scales, wherein, first, a window size is selected. Next, a set of the grid points is defined defining grid cells of the selected window size. Next, the geometric at... | 12/03/2002 |
| 6490528 | Method for imaging discontinuites in seismic data Structural and stratigraphic discontinuities are identified in a 3-D volume of seismic data samples, by first selecting a plurality of directions containing a primary direction and at least one secondary direction. Next, one-dimensional, two-trace first d... | 12/03/2002 |
| 6442487 | Reliability measures for statistical prediction of geophysical and geological parameters in geophysical prospecting A method for assessing reliability of a prediction model constructed from N training data attribute vectors and N associated observed values of a specified parameter. Each training data attribute vector includes seismic attributes obtained from seismic da... | 08/27/2002 |
| 6438493 | Method for seismic facies interpretation using textural analysis and neural networks Seismic facies are identified in a volume of seismic data, wherein, first, a plurality of initial textural attributes representative of the volume of seismic data are calculated. Next, a probabilistic neural network is constructed from the calculated init... | 08/20/2002 |
| 6430509 | Method for 2D inversion of dual laterolog measurements A 2D inversion of true formation resistivity from dual laterolog tool measurements is accomplished using a pre-calculated look-up table. An initial earth model is derived and divided into intervals. A 2D tool response is calculated in each interval using ... | 08/06/2002 |
| 6074610 | Multi-sample reactor A reactor for subjecting multiple reactant samples to controlled conditions with respect to pressure, temperature, and time. All individual samples in a single test run are exposed to the same temperature and pressure profiles but can be independently and... | 06/13/2000 |
| 5740342 | Method for generating a three-dimensional, locally-unstructured hybrid grid for sloping faults A method of generating an automatic, three-dimensional, locally-unstructured, hybrid grid for geological formations with a sloping fault. The grid generation system replaces the portion of an existing finite-difference grid around the sloping fault with a... | 04/14/1998 |
| 5724306 | Method for correcting dual sensor data for imperfect geophone coupling using production seismic data A marine seismic surveying method recording with a first sensor a first signal indicative of pressure and with a second sensor a second signal indicative of motion, calculating a coupling mechanism filter for the second signal substantially correcting for... | 03/03/1998 |
| 5616059 | Tailbuoy with self-deploying mast The present invention is a floatation apparatus with a self-deploying mast for use in a marine towing operation. The invention includes a mast assembly. The mast assembly comprises a shaft adapted to pivotally mount in a storage position on the floatation... | 04/01/1997 |
| 5598378 | Method of performing high resolution crossed-array seismic surveys This invention provides a method for performing three dimensional seismic surveys. In one configuration, receiver lines containing equally spaced receiver stations run in one direction while the source station lines run orthogonal to the receiver station ... | 01/28/1997 |
| 5587965 | Surface multiple attenuation via eigenvalue decomposition A marine seismic signal is transformed from time domain into frequency domain and represented by matrix D. The marine data signal is truncated in time, transformed into the frequency domain and represented by matrix DT. Eigenvalue decomposition... | 12/24/1996 |
