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| Number | Title | Issue Date |
| 8064288 | Method for passive seismic emission tomography using adaptive velocity filter A method for seismic event mapping includes adaptively velocity filtering seismic signals recorded at selected positions. The velocity filtered signals are transformed into a domain of possible spatial positions of a source of seismic events. An origin in spatial po... | 11/22/2011 |
| 8054711 | Method and apparatus for attenuation wind noise in seismic data A method and apparatus for use in seismic prospecting are disclosed. The method includes: attenuating coherent noise in a seismic data set generated from a sweep signal; and correlating the coherent noise-attenuated seismic data set to the sweep signal. The apparatu... | 11/08/2011 |
| 7830746 | Method for treating seismic data corresponding to acquisitions obtained for a common zone by means of underwater seismic receivers and by means of surface receivers Method for processing seismic data sets corresponding to the same zone, some of which are acquired by means of receivers at the ocean bottom, while others are acquired by means of surface receivers, characterized in that at least one seismic data set that is an esti... | 11/09/2010 |
| 7616525 | Method and apparatus for attenuation wind noise in seismic data A method and apparatus for use in seismic prospecting are disclosed. The method includes: attenuating coherent noise in a seismic data set generated from a sweep signal; and correlating the coherent noise-attenuated seismic data set to the sweep signal. The apparatu... | 11/10/2009 |
| 7433265 | Converted wave energy removal from seismic data Coherent wave noise energy is removed from seismic data by modeling both the P-wave primary energy and the coherent wave noise energy. The P-wave primary energy is modeled first and then subtracted from the input data. The data with the P-wave primary energy removed... | 10/07/2008 |
| 7366054 | Tau-P filters for removal of noise from seismic data Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. The methods comprise the steps of assembling seismic data into common geometry gathers in an offset-time domain without correcting the data for normal mo... | 04/29/2008 |
| 7328109 | Processing seismic data A method of processing seismic data comprises transforming seismic data which contain coherent noise to a domain in which at least some of the coherent noise is transformed to incoherent noise. The seismic data are then filtered in the new domain, to remove or atten... | 02/05/2008 |
| 7327633 | Systems and methods for enhancing low-frequency content in vibroseis acquisition This invention relates in general to vibroseis and, more specifically, but not by way of limitation, to the enhancement and/or signal strength optimization of low frequency content of seismic signals for use in surveying boreholes and/or subsurface earth formations.... | 02/05/2008 |
| 7310580 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 12/18/2007 |
| 7289909 | Method for borehole measurement of formation properties The present invention is a method of estimating formation properties by analyzing acoustic waves that are emitted from and received by a bottom hole assembly. A bottom hole assembly may be deployed in a borehole to estimate formation properties. From the bottom hole... | 10/30/2007 |
| 7268696 | Directional signal and noise sensors for borehole electromagnetic telemetry system An electromagnetic borehole telemetry system providing improved signal to noise ratio. Adaptive filters use noise channels as references to remove noise from the signal channel. Directional detectors provide a signal channel with reduced noise content and improved n... | 09/11/2007 |
| 7257492 | Handling of static corrections in multiple prediction A method is for use in seismic data processing includes improving the continuity of the primary events in an original seismic dataset to create a continuous, seismic dataset; predicting at least the first order multiples of the original seismic dataset from the cont... | 08/14/2007 |
| 7098838 | Amplified analog information reading device with linear DB mode gain control, in particular for an image sensor An amplified reading device includes an adjustable gain amplifier AMP receiving analog information and of which 2j successive gain values, respectively adjustable by 2j successive values of a first control word of j bits, follow a geometric pro... | 08/29/2006 |
| 7089119 | Acoustic signal processing method using array coherency A system and method is provided for characterizing earth formations. In one embodiment, the method includes passing a logging tool through a borehole and repeatedly: (a) triggering an acoustic wave generator; (b) recording acoustic waveforms received by receivers in... | 08/08/2006 |
| 7064624 | Power conditioners and pseudo isolation for a two-wire processing network An isolator, such as a common-mode-reactor, and power-conditioner network is utilized to provide at least one of adequate segment impedance, cross-talk or adequate high-frequency-interference attenuation on, or between, participating segments. The participating segm... | 06/20/2006 |
| 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 |
| 7020664 | File management apparatus and method Upon receipt of a segment name obtainment request, the segment name generation unit 104 generates a segment name composed of (1) a file name of a file to which the segment belongs and (2) a number indicating a serial number of the segment in the file. Upon re... | 03/28/2006 |
| 6996471 | Adding a signal to seismic data The present invention provides a method and apparatus for analyzing seismic data. The method includes determining a portion of the seismic data recorded substantially before the arrival of a seismic signal and adding a test signal to the portion of the seismic data ... | 02/07/2006 |
| 6961283 | Adaptive filtering apparatus and method for seismic data acquisition The present invention provides an adaptive filtering method for substantially eliminating ground roll noise encountered during seismic data acquisition. An apparatus for acquiring seismic data is provided that includes an adaptive filtering circuit coupled to a mult... | 11/01/2005 |
| 6956790 | Borehole sonic data processing method A method of processing sonic wireline or logging while drilling data acquired in a borehole that includes filtering the sonic data to attenuate tool-borne and borehole-borne arrivals; migrating the filtered sonic data; and beamforming the filtered and migrated sonic... | 10/18/2005 |
| 6801473 | Method for estimating and removing artifact noise from seismic data A seismic signal is represented as a combination of a geologic signal and a noise signal. The representation of the seismic signal is decomposed into a linear combination of orthonormal components. One or more components are identified in which the geologic signal a... | 10/05/2004 |
| 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 |
| 6691073 | Adaptive state space signal separation, discrimination and recovery This invention unifies a set of statistical signal processing, neuromorphic systems, and microelectronic implementation techniques for blind separation and recovery of mixed signals. A set of architectures, frameworks, algorithms, and devices for separati... | 02/10/2004 |
| 6651007 | Adaptive seismic noise and interference attenuation method A method relating to filtering coherent noise and interference from seismic data by constrained adaptive beamforming is described using a constraint design methodology which allows the imposition of an arbitrary predesigned quiescent response on the beamf... | 11/18/2003 |
| 6636816 | Vector signal analysis method and apparatus therefor An error-suppression signal measurement system and method therefor is provided. The system transmits a test signal from a first probe, through a device under test, and into a second probe. The probes extract normalization signals from reference signals th... | 10/21/2003 |
| 6519205 | Ground roll attenuation method A method is disclosed for attenuating ground roll in seismic data signals. Seismic data signals are obtained from nearby seismic sensors. A difference filter is created that incorporates an estimate of ground roll differential move-out between the seismic... | 02/11/2003 |
| 6446009 | Seismic data acquisition and method for spatially filtering seismic data A method of acquiring and processing seismic data involving deploying a number of seismic sensors, actuating a seismic source, receiving seismic signals produced by the seismic source using the seismic sensors, calculating offset distances (44) between th... | 09/03/2002 |
| 6446008 | Adaptive seismic noise and interference attenuation method A method relating to filtering coherent noise and interference from seismic data by constrained adaptive beamforming is described using a constraint design methodology which allows the imposition of an arbitrary predesigned quiescent response on the beamf... | 09/03/2002 |
| 6373396 | Method for predicting seismic events A method for predicting seismic events wherein measurable and calculable parameters relating to alterations in the shape of the geoid, such as centripetal and tidal gravitational effects, and gravitational anomalies related to a buildup of energy at any g... | 04/16/2002 |
| 5986973 | Energy minimization in surface multiple attenuation 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 ... | 11/16/1999 |
| 5982706 | Method and system for determining normal moveout parameters for long offset seismic survey signals A method and computer system for deriving and applying normal moveout corrections to seismic survey traces is disclosed. In each common midpoint (CMP) gather, a stacking velocity function of travel time is first determined for near-offset traces. For each... | 11/09/1999 |
| 5971095 | Noise filtering method for seismic data A method for filtering noise from discrete noisy seismic signals in a time interval ([1, . . . , T]) is provided. The method comprising the steps of using the noisy seismic signals for determining at least one reference channel (x(t)) for the time interva... | 10/26/1999 |
| 5781503 | Method for attenuating surface wavetrains in seismic data A method for attenuating source-generated surface wavetrains in a set of seismic data traces. According to the method, the seismic data traces are Fourier transformed with respect to time to determine the frequency components of the surface wavetrain. A p... | 07/14/1998 |
| 5781502 | Method and device for filtering elliptical waves propagating in a medium The present invention relates to a filtering method for discriminating elliptical waves among other waves propagating in a material medium (such as a geologic formation for example) by a combined processing of the components measured along several axes of... | 07/14/1998 |
| 5771203 | Seismic prospection method with application of a self-deconvoluted prediction error filter The invention relates to a seismic prospection method in which a seismic disturbance is generated in the sub-soil and sensors are used to pick up seismic data, the seismic data being processed to deduce useful information concerning the geology of the sub... | 06/23/1998 |
| 5684754 | Method and system for correcting seismic traces for normal move-out stretch effects A computer-implemented method and system of correcting seismic survey data for the effects of NMO stretch is disclosed. The method operates upon a CDP gather of seismic survey data after normal move-out correction (NMO) has been applied. A semblance analy... | 11/04/1997 |
| 5594706 | Downhole processing of sonic waveform information Methods for processing sonic logging data obtained by a sonic imaging tool or an MWD tool are provided. The sonic logging data are bandpass filtered and sampled according to techniques such as integer band decimation, quadrature modulation, and single sid... | 01/14/1997 |
| 5572483 | Method of reducing noise in seismic signals by adaptive filtering of a noise reference A method of reducing effects of noise in seismic signals generated by a plurality of seismic sensors at spaced apart locations from a seismic source is disclosed. Each of the signals is represented by a signal trace in a record section. The method include... | 11/05/1996 |
| 5555530 | Method for improving signal to noise ratio A method for improving the signal to noise ratio from a pair of detectors such as geophones which each detect a noisy signal comprising a signal of interest (S) and a noise signal (N), wherein the signal of interest (S) has a different moveout across the ... | 09/10/1996 |
| 5528555 | System and method for compensating for towed array motion induced errors A system for compensating for noise induced in a sensor data stream from a sensor array towed by a towing device includes a towing device motion data input receives a towed motion data stream representative of towing motion of the towing device. A sensor ... | 06/18/1996 |
