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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...
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7555389 |
Creating an Absorption Parameter Model
To generate an absorption parameter model, estimated values of an effective absorption parameter are received, where the estimated effective absorption parameter values represent absorption...
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7535955 |
Methods, algorithms, software, architectures, systems and circuitry for adaptive filtering and/or minimizing a sequence detector error rate
Methods, algorithms, software, architectures, systems and circuits for targeting certain dominant error types in an adaptive FIR filter and/or signal equalizer. The method and algorithm generally...
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7447114 |
Non-linear seismic trace matching to well logs
A method and apparatus for seismic trace matching to well logs.
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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...
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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...
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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...
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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....
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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5448531 |
Method for attenuating coherent noise in marine seismic data
A method for adaptively creating a filter for removing coherent environmental noise from a multitrace digitized seismic recording requires the presence, on the recording, of a limited sample of...
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5349527 |
Method of seismic time migration using a massively parallel computer
A method for 3 dimensional, one pass migration of post stack seismic data is implemented on a massively parallel computer. The quality of the migration and speed of execution makes possible...
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5251183 |
Apparatus and method for marine seismic surveying utilizing adaptive signal processing
A method and apparatus for attenuating bulge wave noise from data recorded by seismic streamers is provided. The apparatus includes a marine seismic streamer having a seismic detector and an...
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5229765 |
SP noise cancellation technique
An adaptive transversal filter is incorporated with an SP conductor extending through a logging cable to the surface from an SP electrode supported on a sonde. This logging cable is operated in a...
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5209237 |
Method and apparatus for detecting a signal from a noisy environment and fetal heartbeat obtaining method
To provide an accurate reproduction of a signal detected in a noisy environment, a primary signal sensor and a plurality of "signal-free" reference sensors are used. Information collected from the...
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5191526 |
Method for removing coherent noise from seismic data
Method for removing coherent noise from a series of seismic traces. Each seismic trace included in the series is Fast Fourier Transformed into the frequency domain. For each frequency of the...
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5050226 |
Ultrasonic echographic imaging device utilizing an improved adaptive filter
An ultrasonic echographic imaging device for two dimensions (x, y), includes an adaptive filter for reducing the interference noise in the images obtained. A first circuit differentiates the signal...
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4967401 |
Method of acquiring and interpreting seismic data to obtain lithological parameters
A method for locating hydrocarbon reservoirs or other geological anomalies by determining lithological parameters including Poisson's ratio, density and seismic wave velocity. Such parameters are...
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4964087 |
Seismic processing and imaging with a drill-bit source
An apparatus (10) for determining while drilling in the earth with a drill bit (12) the positions of seismic wave reflecting geologic formations (15, 17) has seismic wave sensors (A, B) positioned...
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4890264 |
Seismic exploration method and apparatus for cancelling non-uniformly distributed noise
A seismic exploration method and apparatus in which non-uniformly distributed noise signals generated by wind, machinery, or surface wave propagation and received by the sensing geophones are...
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4858199 |
Method and apparatus for cancelling nonstationary sinusoidal noise from seismic data
Method and apparatus for cancelling nonstationary sinusoidal noise from seismic data. An estimate of the sinusoidal noise component is applied to a contaminated signal containing both a sinusoidal...
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4857867 |
Method and apparatus for locking the frequency and phase of a local oscillator
The output of a local oscillator is applied to an external signal to produce a feedback error signal. The feedback error signal is utilized in adjusting the phase, frequency and amplitudes...
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4809238 |
Method for restoring the background appearance of two-dimensional filtered seismic data
A method for restoring to filtered seismic data at least some of the ramdom background noise associated with the data in its form prior to filtering. The method includes the steps of filtering...
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4797668 |
Acoustic well logging system having multiplexed filter digitizing
In an acoustic well logging system having an acoustic transmitter in a sonde and spaced acoustic receivers, an acoustic transmitter control circuit enabling transmission of high frequency pulses,...
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4783660 |
Signal source distortion compensator
A signal processing system in a transmitter/receiver system for reducing undesired amplitude, frequency and/or phase distortions arising due to variations from transmitter pulse to transmitter...
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4757516 |
Transversal equalizer
An equalizer is provided with a branching device for branching a digitally modulated signal into two outputs. A series of weighting devices weights one of the outputs of the branching means, and a...
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4750157 |
Seismic vibrator earth impedance determination and compensation system
An earth impedance determination and compensation system for use with a seismic vibrator utilizes output signals from accelerometers on the baseplate and reaction mass portions of the vibrator to...
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4750156 |
Noise suppression during seismic exploration
The system for suppressing an ambient noise signal which comtaminates a desired signal includes a noise pickup detector for detecting the ambient noise signal. A noise discriminator processes the...
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4740929 |
Method for suppressing noise in seismic data
A method for recursively, continuously estimating the noise and signal components of a seismic trace. More particularly, a method for suppressing the noise component in seismic data so as to...
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4709357 |
Method and apparatus for acoustically investigating a borehole casing cement bond
A method and apparatus are disclosed for acoustically investigating a borehole casing cement bond. A sonde is provided which is adapted to be lowered into a borehole and which includes a plurality...
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4700300 |
Indicating barehole rugosity as a function of the difference between shallow and deep log indices
Statistical variations in simultaneous shallow and deep investigation nuclear borehole logs are reduced using digital moving average data processing while maintaining responsiveness to formation...
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4692909 |
Adaptive seismic signal processor
In portable seismic data acquisition units, an adaptive seismic signal processor and method for resampling and bandpassing selected frequencies of an input digital signal. The adaptive seismic...
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4679174 |
Method for seismic lithologic modeling
A method of seismic exploration of the subsurface of the earth. Seismic reflection data are gathered in a selected area. The seismic data are combined with available non-seismic data to define an...
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4630246 |
Seismic-acoustic low-flying aircraft detector
The detection of low-flying aircraft is accomplished using both a microphone and geophone as sensors and a signal processing system for measuring the correlation between the seismic and acoustic...
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