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| Number | Title | Issue Date |
| 7926614 | Particle motion sensor mounting for marine seismic sensor streamers A marine seismic streamer includes a jacket substantially covering an exterior of the streamer. At least one strength member is disposed along the length of the jacket. A sensor mount is coupled to the strength member. At least one particle motion sensor is suspende... | 04/19/2011 |
| 7822515 | Ocean bottom seismic sensor cable system including torque-relieving swivel An ocean bottom cable system includes a sensor cable configured to be extended from a vessel to the bottom of the body of water. The sensor cable includes a plurality of seismic sensor units at spaced apart locations. A lead in cable is coupled at a to at least one ... | 10/26/2010 |
| 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 |
| 7689396 | Targeted geophysical survey In one embodiment the invention comprises a system for planning a seismic survey based on a model of a subsurface formation in which a computer simulation is generated having sources and receivers positioned in selected locations with respect to the model. Ray traci... | 03/30/2010 |
| 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 |
| 7468932 | System for noise attenuation in marine seismic streamers A marine seismic streamer section has at least one strength member positioned in the streamer section, a solid material, which may be a soft compliant solid material, substantially filling the marine seismic streamer section around the strength member; and means for... | 12/23/2008 |
| 7447113 | Kirchhoff prestack time migration method for PS waves A method is disclosed for migrating seismic data which includes determining travel time of a compressional wave from a source location to a scatter point, taking into account ray bending. Travel time of a shear wave from the scatter point to a receiver location is d... | 11/04/2008 |
| 7390217 | Solid construction electrical connector adapted for use with seismic data acquisition systems A connector for a seismic data acquisition cable includes a molded plastic connector body. The connector body has inserted therein at least one electrical contact for mating with a corresponding electrical contact. The connector body has an internal opening for rece... | 06/24/2008 |
| 7388808 | Method for depth migrating seismic data using pre-stack time migration, demigration, and post-stack depth migration A method is disclosed for depth migrating seismic data. The method includes pre-stack time migrating the seismic data to form a stacked, time migrated image. The stacked, time migrated image is demigrated, and post-stack depth migration is then performed on the demi... | 06/17/2008 |
| 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 |
| 7336561 | System for attenuation of water bottom multiples in seismic data recorded by pressure sensors and particle motion sensors An up-going wavefield and a down-going wavefield are calculated at a sensor position from a pressure sensor signal and a particle motion sensor signal. Then, an up-going wavefield is calculated at a water bottom position substantially without water bottom multiples ... | 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 |
| 7239577 | Apparatus and methods for multicomponent marine geophysical data gathering In one embodiment the invention comprises a particle velocity sensor that includes a housing with a geophone mounted in the housing. A fluid that substantially surrounds the geophone is included within the housing. The particle velocity sensor has an acoustic impeda... | 07/03/2007 |
| 7222534 | Optical accelerometer, optical inclinometer and seismic sensor system using such accelerometer and inclinometer An optical accelerometer includes a beam and at least one optical fiber affixed to one side of the beam such that deflection of the beam changes a length of the optical fiber. A device for sensing the change in length of the optical fiber is functionally coupled to ... | 05/29/2007 |
| 7184365 | Unitary multi-cable towing system In one aspect the invention comprises a system and a method for marine geophysical exploration, which includes a first cable connected to a vessel and a plurality of streamer cables connected to the first cable. The first cable includes all towing strength members a... | 02/27/2007 |
| 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 |
| 7167414 | Amplitude preserving prestack migration method A method is disclosed for amplitude preserving Kirchhoff time migration. The method includes calculating estimates of the geometrical spreading terms using a constant velocity approximation. Takeoff and emergence angles are accurately calculated based on a model of ... | 01/23/2007 |
| 7154082 | Frequency division and/or wavelength division multiplexed recursive fiber optic telemetry scheme for an optical sensor array An optical fiber sensor array is disclosed which includes a first sensor fiber and a first reference fiber coupled at one end thereof to one side of a first optical coupling. A first wavelength selective reflector is coupled to the other end of each of the first sen... | 12/26/2006 |
| 7139217 | Water bottom cable seismic survey cable and system A seismic sensor cable is disclosed. The cable includes an outer jacket disposed on an exterior of the cable. The outer jacket excludes fluid from entering an interior of the cable. A reinforcing layer disposed within the outer jacket, which includes at least one el... | 11/21/2006 |
| 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 |
| 7113448 | Water bottom cable seismic survey cable and system A seismic sensor cable is disclosed. The cable includes an outer jacket disposed on an exterior of the cable. The outer jacket excludes fluid from entering an interior of the cable. A reinforcing layer disposed within the outer jacket, which includes at least one el... | 09/26/2006 |
| 7065004 | Horizon-based residual depth migration velocity analysis A method is disclosed for processing seismic data. The method includes prestack depth migrating the seismic data to generate common image gathers using an initial velocity-depth model. Horizons in the migrated seismic data are selected. Residual migration velocity a... | 06/20/2006 |
| 7061829 | Water bottom cable seismic survey cable and system A seismic sensor cable is disclosed. The cable includes an outer jacket disposed on an exterior of the cable. The outer jacket excludes fluid from entering an interior of the cable. A reinforcing layer disposed within the outer jacket, which includes at least one el... | 06/13/2006 |
| 7058514 | Method for attenuating noise in seismic data using complex trace diversity filter A method is disclosed for attenuating noise in seismic data. The method includes calculating a trace envelope for at least part of at least one seismic trace, generating a filtered envelope from the trace envelope, and transforming the filtered envelope to a filtere... | 06/06/2006 |
| 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 |
| 7028988 | Cable handling system A system or apparatus and method for retrieving cable from water during marine operations is provided that reduces damage to the cable from pulling forces during the retrieval. A pulling device distributes the forces and stresses all along the cable components. In o... | 04/18/2006 |
| 7031223 | Method for correcting seismic data for receiver movement during data acquisition A method is disclosed for processing seismic data. The method includes determining a position of a seismic energy source and seismic receivers at a time of actuation of the source. A velocity of the seismic receivers with respect to the source position is determined... | 04/18/2006 |
| 6985405 | Method for stable estimation of anisotropic parameters for P-wave prestack imaging A method is disclosed for determining interval anisotropic parameters. The method includes determining normal moveout (NMO) velocities and effective anelliptical parameters from seismic data traces. The NMO velocities are processed to obtain interval NMO velocities.... | 01/10/2006 |
| 6982926 | Apparatus and method for bubble shielding towed marine cable A cable for towing marine devices is disclosed. The cable includes a strength member and at least one conduit associated with the strength member. The conduit has apertures therein at selected locations along the conduit. The apertures are adapted to conduct gas fro... | 01/03/2006 |
| 6982925 | Fiber-optic seismic array telemetry, system, and method A method and system for interrogating a seismic sensor in a seismic cable having modular sensing stations spaced along the seismic cable and a connection module head end of the sensor sections, that includes dropping, at the connection modules, a wavelength of light... | 01/03/2006 |
| 6970396 | Fiber-optic seismic array telemetry, system, and method A method for attaching seismic sensors in a seismic cable that includes a strength member inside a cable jacket with a fiber tube wound around the strength member and a sensor station base attached around the cable wherein the jacket is removed, at least one fiber t... | 11/29/2005 |
| 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 |
| 6906981 | Method and system for acquiring marine seismic data using multiple seismic sources A method for seismic surveying is disclosed which includes towing a first seismic energy source and at least one seismic sensor system. A second seismic energy source is towed at a selected distance from the first source. The first seismic energy source and the seco... | 06/14/2005 |
| 6903998 | Method for acquiring and processing seismic survey data using ocean bottom cables and streamers A method is disclosed for marine seismic surveying in which a seismic signal is detected in a body of water with a motion sensor and a pressure sensor positioned at a location proximate the bottom of the body of water. Seismic signals are detected with pressure sens... | 06/07/2005 |
| 6882938 | Method for separating seismic signals from two or more distinct sources A method is disclosed for separating energy resulting from actuating at least two different seismic energy sources from seismic signals. The sources are actuated to provide a variable time delay between successive actuations of a first one and a second one of the so... | 04/19/2005 |
| 6856911 | Pseudo-offset migration A method of migration of a seismic data is disclosed. The data include a data point having an input source location, an input receiver location, and a scatter point associated therewith. The method includes determining a projected source location, and determining a ... | 02/15/2005 |
| 6850461 | Fiber-optic seismic array telemetry, system, and method An apparatus, system, and method are provided for interrogating of optical seismic sensors in a seismic cable. According to various example embodiments of the invention, distribution, return, and amplification of optical signals is performed near sensors for improve... | 02/01/2005 |
| 6827597 | Combined electrical and optical cable connector particularly suited for marine seismic sensor streamers A connector is disclosed for joining two cable ends. The connector includes a load transfer plug adapted to couple to a strength member in each end of the cable. A connector insert assembly is coupled to an inner portion of each load transfer plug. Conductor termina... | 12/07/2004 |
| 6826484 | 3D prestack time migration method A method is disclosed for migrating seismic data. The method includes selecting an image point and generating an initial model of seismic velocity with respect to time. The initial model includes substantially horizontal layers each having a selected interval veloci... | 11/30/2004 |
