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| Number | Title | Issue Date |
| 8164978 | Interbed multiple prediction 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 firs... | 04/24/2012 |
| 8116166 | 3D deghosting of multicomponent or over / under streamer recordings using cross-line wavenumber spectra of hydrophone data A technique includes obtaining pressure data that was acquired by seismic sensors towed as part of a three-dimensional spread of streamers and obtaining particle motion data, which are indicative of particle motion at locations of the sensors. The technique includes... | 02/14/2012 |
| 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 |
| 8077544 | Dual-wavefield multiple attenuation Method for attenuating surface multiple reflections in dual-wavefield seismic data. In one implementation, the method may include: (a) performing wavefield separation on dual-wavefield seismic data to separate events in the seismic data into data sets according to g... | 12/13/2011 |
| 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 |
| 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 |
| 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 |
| 7864628 | Flexural wave attenuation A seismic information processing method and apparatus includes attenuating flexural wave noise information from seismic information. Flexural wave information removal includes receiving the seismic information using an information processing device interface, the se... | 01/04/2011 |
| 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 |
| 7821869 | Methods of enhancing separation of primary reflection signals and noise in seismic data using radon transformations Improved methods of processing seismic data which comprise amplitude data assembled in the offset-time domain in which primary reflection signals and noise overlap are provided for. The methods include the step of enhancing the separation between primary reflection ... | 10/26/2010 |
| 7817495 | Jointly interpolating and deghosting seismic data 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... | 10/19/2010 |
| 7800977 | Pre-stack combining of over/under seismic data The present invention provides a method for pre-stack combining of over/under seismic data. The method includes determining a calibration filter using a first pre-stack marine seismic data set acquired at a first depth and a second pre-stack marine seismic data set ... | 09/21/2010 |
| 7796467 | Generalized 3D surface multiple prediction A method and apparatus for predicting a plurality of surface multiples for a plurality of target traces in a record of seismic data. In one embodiment, the method includes creating a file containing information regarding a plurality of pairs of recorded traces. Each... | 09/14/2010 |
| 7791980 | Interpolation and extrapolation method for seismic recordings A method includes: interpolating a set of crossline seismic data from a set of acquired multicomponent seismic data; predicting a multiple in the interpolated and acquired seismic data from the combined interpolated and acquired multicomponent seismic data; and supp... | 09/07/2010 |
| 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 |
| 7710821 | Multiple attenuation method A method is described for reducing multiples in marine seismic data using at least two sets of signals representing seismic energy reflected and/or refracted from an earth structure using a plurality of seismic receivers located in a body of water with the two sets ... | 05/04/2010 |
| 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 |
| 7679991 | Processing of seismic data acquired using twin over/under streamers A method for processing seismic data acquired using a first over/under streamer and a second over/under streamer. In one implementation, the method may include estimating seismic data that would have been acquired by a third over/under streamer disposed at a depth e... | 03/16/2010 |
| 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 |
| 7672192 | Method for computing and using timing errors that occur in multiples predicted by multiple prediction algorithm Method for computing one or more timing errors that occur in one or more multiples predicted by a multiple prediction algorithm. The method includes the steps of generating one or more actual three-dimensional primary travel times and one or more actual three-dimens... | 03/02/2010 |
| 7646673 | Wave analysis using phase velocity processing A method and apparatus for processing acoustic data recorded by a subterranean receiver array. The method includes emitting an acoustic signal into a formation, receiving the signal after it passes through the array, and processing the data with semblance and phase ... | 01/12/2010 |
| 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 |
| 7505360 | Fast 3-D surface multiple prediction A method and apparatus for predicting a plurality of surface multiples for a plurality of traces in a record of seismic data. In one embodiment, the method includes providing a plurality of target traces at a nominal offset and a nominal azimuth; selecting a plurali... | 03/17/2009 |
| 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 |
| 7489590 | Method and apparatus for source and receiver side wave field separation The present invention provides a method and apparatus for wave field separation. The method includes accessing a marine seismic data set acquired by a plurality of receivers deployed at a first plurality of depths in response to a plurality of acoustic signals provi... | 02/10/2009 |
| 7466625 | Noise estimation in a vector sensing streamer A method includes recording a first set of data using a first type of sensor; recording a second set of data using a second type of sensor, the first and second sets of data being contemporaneously acquired by co-located sensors; and removing noise from the first da... | 12/16/2008 |
| 7450468 | Methods, systems, and computer readable media for interactively determining parameters for ocean-bottom hydrophone/geophone receiver combination deghosting Methods, systems, and computer readable media are provided for interactively determining optimum deghosting parameter values for suppressing ghost reflections. Seismic data are obtained from various hydrophone/geophone receiver locations. Energy traces are generated... | 11/11/2008 |
| 7418349 | Method of and apparatus for processing seismic data A method of processing seismic data that includes including first and second modes of seismic energy where the second mode has been generated by partial mode conversion of the first mode at a boundary face of a layer of the seabed includes the step of cross-correlat... | 08/26/2008 |
| 7386397 | Processing seismic data A method of determining a vertical component of particle velocity from seismic data acquired using at least one receiver disposed within a water column comprises determining the vertical component of particle velocity from the pressure at a first location and a seco... | 06/10/2008 |
| 7372769 | Method and apparatus for adaptive over/under combination of seismic data The present invention provides a method and apparatus for wave field separation. The method includes determining a first operator using marine seismic data acquired at a first depth and receivers deployed at a second depth, determining a second operator using marine... | 05/13/2008 |
| 7366055 | Ocean bottom seismic sensing system Seismic sensor systems and sensor station topologies, as well as corresponding cable and sensor station components, manufacturing and deployment techniques are provided. For some embodiments, networks of optical ocean bottom seismic (OBS) stations are provided, in w... | 04/29/2008 |
| 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 |
| 7349292 | Increased effective aperture for receive arrays A sonar dome having an acoustic array housed therein. A plurality of bubbles are generated within the fluid inside the sonar dome. The generated bubbles are of an amount and size to reduce the speed of sound within the sonar dome fluid. Reduction of the speed of sou... | 03/25/2008 |
| 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 |
| 7333392 | Method for estimating and reconstructing seismic reflection signals A method for reconstructing seismic data signals of poor quality to improve the signal-to-noise ratio of the data for display and analysis in connection with the selection of drilling sites for recovery of hydrocarbons. The method includes providing a signal model b... | 02/19/2008 |
| 7328108 | Processing seismic data A method of processing multi-component seismic data acquired at a receiver station comprises determining a calibration filter that calibrate a first component of the seismic data relative to a second component of the seismic data in order to compensate for differenc... | 02/05/2008 |
| 7321526 | Method and apparatus for water velocity decomposition The present invention provides a method for analyzing traces collected along a plurality of adjacent sail lines in a marine seismic survey area. The method comprises selecting a plurality of trace groups, at least one trace in each group sharing a common midpoint wi... | 01/22/2008 |
| 7319330 | System and method for electromagnetic wavefield resolution A method of processing an electromagnetic wavefield response in a seabed logging operation. The wavefield is resolved into upgoing and downgoing components. The downgoing component represents reflections from the sea surface while the upgoing component represents re... | 01/15/2008 |
| 7319636 | Calibration of pressure gradient recordings A method for computing a pressure signal gradient. The method includes recording a plurality of pressure signals at least one of a first receiver and a second receiver. The first receiver and the second receiver are disposed within a cluster. The method further incl... | 01/15/2008 |
