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7596055 |
Attenuating unwanted signal using interferometry techniques
A method to attenuate unwanted signals in seismic data using seismic interferometry techniques. In one implementation, seismograms may be converted into seismic interferograms. In the seismic...
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7564740 |
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...
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7561491 |
Radon transformations for removal of noise from seismic data
Methods of processing seismic data to remove unwanted noise from meaningful reflection signals are provided for. Assembled seismic data are transformed from the offset-time domain to 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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7457195 |
Estimating the time of arrival of a seismic wave
Data processing means are described for calculating an estimated time of arrival of a seismic or microseismic P or S wave at a sensor station, based on a P to S wave velocity ratio, a calculated...
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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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7397728 |
Method for processing a record of seismic traces
An apparatus and method for processing a record of seismic traces. The method includes receiving the record of seismic traces in a time-offset domain, transforming the record of seismic traces to a...
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7382682 |
Processing seismic data
The invention relates to processing seismic data that contains both a desired signal and swell noise. The method is applicable to seismic data is in the frequency-space domain method and comprises...
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6788619 |
Concentrating seismic energy in a selected target point in an underground formation
Providing a set of seismic sources in a focusing array to enable concentrating seismic energy in a selected target point (k) in an underground formation, by performing a standard seismic survey of...
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6747915 |
Seismic imaging a subsurface formation
A method of seismic imaging a subsurface formation using an array of seismic sources and an array of seismic receivers located subsurface, wherein there is a complex transmission medium between the...
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6731568 |
Seismic prospecting method using converted wave processing
A seismic prospection method in which a compression seismic wave is emitted into the subsoil and sensors are used to collect seismic data having at least a shear component, and in which the data...
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6614717 |
Time-lapse seismic using nonlinear seismic imaging
This invention relates to using elastically nonlinear seismic imaging methods, to identify the bypassed hydrocarbons and the movement of the reservoir fluids in the reservoir due to injection and...
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6603707 |
Method of reducing harmonic noise in vibroseis operations
The invention relates to a vibroseis analysis method in which frequency-sweep signals ( 10 ) are emitted into a subsurface, the signals reflected on the substrata of such a subsurface ( 10, 20 )...
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6438069 |
Method for time lapse reservoir monitoring
A method of comparing multiple seismic survey data sets of a reservoir, is provided, wherein a first seismic survey data set is taken at a first time and a second seismic survey data set is taken...
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6246637 |
Method and system for combining three component seismic data
A system and method of processing seismic signals wherein seismic data resulting from a reflected seismic wave is received at a multi-component receiver. A mask trace is generated as a function of...
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6049507 |
Method and apparatus for correcting effects of ship motion in marine seismology measurements
An apparatus and method for removing the distortion in marine seismic data resulting from the motion of the ship. The ship trails one or more seismic sources and receivers and moves forward at a...
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6041018 |
Method for correcting amplitude and phase differences between time-lapse seismic surveys
The present invention relates to a time-lapse or 4-D seismic data processing method in which cross-correlation of trace information in a series of time-lapse seismic images is used to distinguish...
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5995446 |
Method of conducting drilling operations using vertical seismic profiles
A method is described for providing improved seismic data to a driller to indicate position and spatial extent of a drilling target which may be up to several hundreds of feet ahead of a drill bit....
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5991238 |
Weighted backus filter method of combining dual sensor traces
A method for attenuating water column reverberations in a dual sensor seismic signal, whereby a pressure signal and a velocity signal are transformed from the time domain to the frequency domain,...
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5970023 |
Reducing aliasing artifacts in seismic data processing using sharpened (TAU-P-Q) transforms
Marine seismic data sets are generally under-sampled spatially because of the relatively long listening times required in deep water. It is customary to use very long spreads in the field thereby...
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5963507 |
Method for improving the accuracy of ocean bottom reflectivity estimations using the inverse backus filter
A method for determining ocean bottom reflectivities from dual sensor seismic data, whereby a first time windowed pressure signal and a first windowed velocity signal are summed to generate a first...
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5901112 |
Signal energy enhancement for seismic exploration
Harmonics, which appear with seismic reflection signals and are responsive to actual vibrations of a land-vibrator for petroleum exploration, are effectively utilized in pulse compression...
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5850622 |
Time-frequency processing and analysis of seismic data using very short-time fourier transforms
The present invention relates generally to method of seismic data processing which provides a superior method of removing or attenuating some forms of seismic noise and can also be used as a basis...
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5825716 |
Method of reverberation removal from seismic data and removal of dual sensor coupling errors
A method for eliminating the influence of multiple reflections in seismic data by determining an up going and down going vector wave-field from the vector wave-field, determining a product of the...
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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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5719822 |
Seismic data radon dip moveout method
A method of processing seismic signal data that uses a special Radon transform for dip moveout (DMO) including the steps of applying conventional pre-DMO steps to the traces, applying a special...
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5703833 |
One step inversion/separation scheme using a plurality of vibrator sources
A method for generating, recording and pre-processing high fidelity vibratory seismic data in a system that uses a plurality of vibratory sources includes the steps of measuring the motion of each...
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5638338 |
Seismic processing apparatus and method
A method of deconvolving surface measured seismic signals reflected from a sub-surface sequence of geological formations, in which the sub-surface sequence of geological formations contains an...
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5521881 |
Method of processing seismic data having multiple reflection noise
Disclosed is a method of processing seismic data containing multiples, which method generally includes as a step, determining the two-way travel time to a suspected multiple generating event. This...
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5481503 |
Apparatus for and method of adaptively processing sonar data
The invention discloses an apparatus for and a method of adaptively processing a sonar power spectrum for improving the display of narrowband line structure characteristic of a target in a...
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5400299 |
Seismic vibrator signature deconvolution
A method for processing seismic vibrator data. The method utilizes a deterministic signature deconvolution of the vibrator data to compress the impulse response of the data resulting in sharper,...
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5384752 |
Method for correcting a seismic source pulse waveform
A method of correcting a seismic pulse waveform for use in deconvolution of reflected pulse data. The source pulse waveform is measured by a hydrophone positioned vertically beneath the acoustic...
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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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5253217 |
Method for seismic exploration including compensation for near surface effects
A method of seismic exploration is disclosed wherein a signal recording obtained from subsurface geophone receivers placed below the weathered layer is used to characterize the waveform of the...
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5237538 |
Method for removing coherent noise from an array of seismic traces
A space time gate is selected surrounding a coherent noise to be removed from an array of seismic traces. Signal-plus-noise within the selected gate is extracted from the array of seismic traces....
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5173879 |
Surface-consistent minimum-phase deconvolution
A method is provided for adaptive minimum-phase deconvolution. The deconvolution method removes source and receiver wavelet variations in a surface-consistent manner from traces of a seismic survey...
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5051963 |
Process for cancelling stationary sinusoidal noise in seismic data
An improved method for cancelling a stationary sinusoid corrupting a data trace is described. The frequency of the corrupting sinusoid is determined precisely and a Wiener-Levinson least squares...
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5010976 |
Characterization of the full elastic effect of the near surface on seismic waves
A method of seismic exploration uses recordings from both surface receivers and buried sensors to determine the full elastic effect of the near surface layer on an applied seismic wave. The surface...
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5010526 |
Method of digital filtering
An improved method for filtering noise bands from seismic data is described. The data is analyzed to determine the frequency component of the undesired noise, and a precise autocorrelation function...
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4992995 |
Methods for attenuating noise in seismic data
The present invention relates generally to methods of enhancing seismic data and, more particularly, to methods of attenuating noise in seismic signals. The seismic data are sorted into gathers of...
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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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4922362 |
Methods for deconvolution of unknown source signatures from unknown waveform data
A method for the determination and deconvolution of the signature of an unknown, non-impulsive source signal. The method supposes that that an array of receivers is positioned at the earth's...
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4910716 |
Suppression of coherent noise in seismic data
A method is disclosed to suppress coherent noise in seismic data. Based on the Karhunen-Loeve Transform, this method trains on a region containing undesired coherent noise. Eigenvectors determined...
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4853903 |
Method and apparatus for removing sinusoidal noise from seismic data
Method and apparatus for removing sinusoidal noise from seismic traces comprised of a seismic data component and a sinusoidal noise component. Seismic traces acquired by conventional seismic...
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4837723 |
Method and apparatus for continuous time-variant digital filtering
A continuous time-variant digital filtering method and apparatus. In particular, a method for continuous time-variant digital filtering of a digitized signal comprrises the steps of windowing the...
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4819214 |
Sonic logging system
A sonic well logging system and apparatus for determination of seismic wave velocities from a seismic wave propagating in a subterranean formation about a wellbore. The system includes the process...
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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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4752916 |
Method and system for removing the effect of the source wavelet from seismic data
The invention provides a method and system for seismic exploration of a body by applying, to the body acoustic energy producing a source wavelet and detecting the response of the body thereto to...
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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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4736347 |
Multiple stacking and spatial mapping of seismic data
Seismic traces are stacked in a plurality of orthogonal measures to form multiple stacked traces at a positive offset. The stacking process determines the apparent velocities as functions of the...
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