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| Number | Title | Issue Date |
| 8174926 | Method for wavefield separation for dual-sensor data using kirchhoff-type datuming and migration A first weighted integral operator is applied to dual-sensor data to extrapolate the dual-sensor data to a first position above an acquisition surface, generating extrapolated data. A second weighted integral operator is applied to the extrapolated data to extrapola... | 05/08/2012 |
| 8131522 | Method for estimating and removing air wave response in marine electromagnetic surveying A method for determining resistivity distribution of formations below a bottom of a body of water from transient electromagnetic signals acquired by imparting a transient electromagnetic field into the water and detecting an electromagnetic response thereto at a plu... | 03/06/2012 |
| 8126652 | Azimuth correction for data reconstruction in three-dimensional surface-related multiple prediction A best fitting trace in seismic data is determined for a desired trace to be reconstructed. An azimuth correction is calculated for the azimuth difference between the best fitting trace and the desired trace. The azimuth correction is applied to the best fitting tra... | 02/28/2012 |
| 8102731 | Method for operating marine seismic vibrator array to enhance low frequency output A method for operating marine seismic vibrators includes towing at least a first and a second marine seismic vibrator in a body of water beneath the hull of a vessel. At least a third marine seismic vibrator is towed at a selected depth in the water other than benea... | 01/24/2012 |
| 8098542 | Combined electromagnetic and seismic acquisition system and method A method for marine geophysical surveying according to one aspect of the invention includes towing at least one geophysical sensor streamer in a body of water. The streamer includes a plurality of spaced apart electromagnetic field receivers disposed at spaced apart... | 01/17/2012 |
| 8094514 | Seismic vibrator array and method for using A method for generating seismic energy for subsurface surveying includes operating a first seismic vibrator and operating at least a second seismic vibrator substantially contemporaneously with the operating the first seismic vibrator. A driver signal to each of the... | 01/10/2012 |
| 8089825 | Method of summing dual-sensor towed streamer signals using cross-ghosting analysis A merged particle velocity signal is generated by combining a recorded vertical particle velocity signal, scaled in an upper frequency range using a time-dependent arrival angle as determined by cross-ghosting analysis, with a simulated particle velocity signal, cal... | 01/03/2012 |
| 8051791 | Helicopter landing platform having motion stabilizer for compensating ship roll and/or pitch A motion compensation system for a helipad on a vessel includes a sensor for measuring a parameter related to at least one or pitch and roll of the vessel. The system includes a first actuator functionally coupled to the helipad to move the helipad translationally w... | 11/08/2011 |
| 8035393 | Fiber optic system for electromagnetic surveying An electromagnetic survey sensing device includes at least two electrodes disposed at spaced apart locations. An electrical to optical converter is electrically coupled to the at least two electrodes. The converter is configured to change a property of light from a ... | 10/11/2011 |
| 7986586 | Method for deghosting marine seismic streamer data with irregular receiver positions Seismic data are obtained for each seismic source activation in a marine streamer and for each frequency, after being transformed to a spectral domain. An iterative conjugate gradient scheme, using a physically-based preconditioner, is applied to the transformed sei... | 07/26/2011 |
| 7974152 | Control system for marine vibrators and seismic acquisition system using such control system A method for controlling output of a marine seismic vibrator includes operating the vibrator using a predetermined driver signal. A vibrator output signal is measured at at least two different places on the vibrator. The at least two measured vibrator output signals... | 07/05/2011 |
| 7969818 | Method for regularizing offset distribution in towed seismic streamer data Seismic data from towed marine streamers are sorted into two-dimensional common midpoint gathers of traces. The gathered traces are ordered by offset. The offset distribution of the ordered traces is regularized. The source and receiver coordinates of the regularize... | 06/28/2011 |
| 7957906 | Method for attenuating low frequency noise in a dual-sensor seismic streamer 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 ... | 06/07/2011 |
| 7957221 | Method for optimum combination of pressure and particle motion sensors for a 3-D spread of dual-sensor marine seismic streamers 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 t... | 06/07/2011 |
| 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 |
| 7881159 | Seismic streamers which attentuate longitudinally traveling waves A seismic streamer includes at least one array of sensors each disposed in a sensor holder at longitudinally spaced apart locations. A longitudinal orientation of at least one sensor or at least one sensor holder is different from that of the other sensors along the... | 02/01/2011 |
| 7881158 | Seismic vibrator having multiple resonant frequencies in the seismic frequency band using multiple spring and mass arrangements to reduce required reactive mass A seismic vibrator includes a transducer, a reactive mass, a base plate to couple motion of the reactive mass to subsurface formations and a linkage system configured to couple motion of the transducer to the reactive mass and the base plate. The linkage system coop... | 02/01/2011 |
| 7881153 | Steerable paravane system for towed seismic streamer arrays A paravane for a seismic acquisition system includes a float, a frame suspended from the float, deflectors affixed to the frame, and means for coupling a tow rope to a lead-in functionally extending between a forward end and an aft end of the frame. The paravane inc... | 02/01/2011 |
| 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 |
| 7869303 | Method for noise suppression in seismic signals using spatial transforms A method for identifying a position of a source of noise in a marine seismic record includes defining, for at least one shot record, a set of possible noise source positions. A difference between travel time of noise from each possible noise source position to each ... | 01/11/2011 |
| 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 |
| 7834632 | Receiver streamer system and method for marine electromagnetic surveying A receiver streamer system for marine electromagnetic surveying includes a first streamer, and a second streamer disposed substantially parallel to and spaced apart from the first streamer. A first pair of electrodes is associated with the first streamer and a secon... | 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 |
| 7800976 | Single foil lateral force and depth control device for marine seismic sensor array A lateral force and depth control device for a marine streamer includes a housing configured to be coupled within the streamer. A control surface is mounted to the housing such that a rotary orientation and an angle of attack of the control surface with respect to t... | 09/21/2010 |
| 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 |
| 7737698 | Low noise, towed electromagnetic system for subsurface exploration A detector for a marine electromagnetic survey system includes a housing arranged to minimize turbulence when the housing is towed through a body of water, and to minimize motion of the housing in any direction other than the tow direction. The housing includes at l... | 06/15/2010 |
| 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 |
| 7733740 | Sensor mount for marine seismic streamer A seismic streamer includes a jacket covering an exterior of the streamer. At least one strength member extends along the length of and disposed inside the jacket. At least one seismic sensor is mounted in a housing affixed to the at least one strength member. A voi... | 06/08/2010 |
| 7693005 | Sensor streamer having two-layer jacket A seismic streamer includes a jacket covering an exterior of the streamer, at least one strength member extending along the length of and disposed inside the jacket, at least one seismic sensor mounted in a sensor spacer affixed to the at least one strength member, ... | 04/06/2010 |
| 7675812 | Method for attenuation of multiple reflections in seismic data A method for attenuating multiple reflections in seismic signals includes coherency filtering the seismic signals. The seismic signals are low pass filtered and high pass filtered seismic signals at a frequency selected such that substantially only multiple reflecti... | 03/09/2010 |
| 7672195 | Diagonal gather trace interpolation Diagonal gather trace interpolation systems and methods are disclosed. In some embodiments, the method includes obtaining seismic traces from a marine seismic survey performed using typically two seismic sources fired in a flip-flop pattern. The seismic traces are p... | 03/02/2010 |
| 7671598 | Method and apparatus for reducing induction noise in measurements made with a towed electromagnetic survey system A method for reducing motion induced voltage in marine electromagnetic measurements includes measuring an electromagnetic field parameter at at least one position along a sensor cable towed through a body of water. Motion of the sensor cable is measured at at least ... | 03/02/2010 |
| 7663972 | Method for three dimensional seismic travel time tomography in transversely isotropic media A method for estimating seismic velocities in vertically transversely isotropic media includes generating an initial estimate of vertical interval velocity and interval normal moveout velocity with respect to depth from seismic data. An initial estimate is generated... | 02/16/2010 |
| 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 |
| 7622706 | Sensor cable and multiplexed telemetry system for seismic cables having redundant/reversible optical connections An optical sensor cable includes at least one light source fiber extending substantially the entire length of the cable. A plurality of optical sensors are functionally coupled at an input thereof to the at least one light source fiber. At least one signal return fi... | 11/24/2009 |
| 7616523 | Method for combining pressure and motion seismic signals from streamers where sensors are not at a common depth A method for using signals measured by pressure responsive seismic sensors and motion responsive seismic sensors disposed in a seismic cable includes simulating a selected range frequency response of the motion responsive sensor signals for each of a plurality of se... | 11/10/2009 |
| 7609585 | Method for sub-salt migration velocity analysis A method for interpreting seismic data below a salt layer includes depth migrating the seismic data to a bottom of the salt layer. The migrating including generating an initial model of velocities below the salt layer. The initial model is scaled by a plurality of s... | 10/27/2009 |
| 7602191 | Cable-type electromagnetic receiver system for subsurface exploration A marine electromagnetic survey cable includes a reference electrode extending substantially along the entire length of the cable. A plurality of spaced apart measuring electrodes is disposed along the cable and each is electrically insulated from the reference elec... | 10/13/2009 |
| 7551518 | Driving means for acoustic marine vibrator A marine vibrator that in a particular embodiment includes a substantially elliptically shaped outer shell, a driver having a first and second end, at least one outer spring connected between the first end and the second end of the driver, and at least one inner spr... | 06/23/2009 |
