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7626887 |
Displacement field calculation
Implementations of various technologies for a method for processing seismic data. In one implementation, the method includes (a) selecting a first trace from a first seismic data set and a second...
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7609585 |
Method for sub-salt migration velocity analysis
A method for interpreting seismic data below a salt layer includes depth migrating the seismic data to a bottom of the salt layer. The migrating including generating an initial model of velocities...
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7583560 |
Synchronization of seismic data acquisition systems
A network distributed seismic data acquisition system comprises seismic receivers connected to remote acquisition modules, receiver lines, line tap units, base lines, a central recording system and...
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7508736 |
Vector migration of 1st order free-surface related downgoing multiples from VSP data
1 st order free-surface multiples recorded in VSP data or reverse VSP data are processed using a 3-C 3-D vector migration method to produce an image of the subsurface. This image produces a larger...
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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...
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7460437 |
Seismic data processing method and system for migration of seismic signals incorporating azimuthal variations in the velocity
A method and system for seismic data processing utilizes azimuthal variations in the velocity of seismic signals. The system and method utilizes a plurality of seismic energy sources that are...
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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...
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7436735 |
Method for seismic processing, in particular for compensating birefringence on seismic traces
A method of seismic processing for obtaining information on the geophysics of the subsoil includes acquiring seismic traces at at least one point on the surface of the subsoil or in the subsoil,...
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7414919 |
Method for improving the seismic resolution
A method for improving the seismic resolution in the field of petroleum exploration and development, using the steps of: (1) ensuring the depth and the velocity of the low-velocity layer and the...
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7400553 |
One-return wave equation migration
A one-return wave equation migration is used to extrapolate both down-going and up-going waves. Followed by a properly designed imaging condition, the partial image contributed form turning waves...
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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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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...
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7359284 |
Method for processing borehole seismic data
Seismic data recorded by subsurface seismic sensors placed in a borehole, such as an oil or gas well, are transformed via a process of upward wavefield propagation to pseudo-receivers at the...
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7355923 |
Seismic analysis using post-imaging seismic anisotropy corrections
System and method for performing anisotropy corrections of post-imaging seismic data for a subsurface formation. The method may receive seismic data, preferably pre-stack seismic data comprising a...
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7345951 |
Method of determining specular information after prestack seismic imaging
Method of determining the specular source/receiver pairs associated with seismic images produced from a transformation of multi-offset seismic wave records as a function of time in the depth...
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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...
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7196969 |
Three-dimensional two-way acoustic wave equation pre-stack imaging systems and methods
A system and method for pre-stack imaging system that includes multiple processors, with each processor configured to perform two-way wave equation-based forward wave propagation of a source event...
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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....
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7099417 |
Trace video filtering using wavelet de-noising techniques
A filter that includes an analyzer, thresholding circuit, and synthesizer. The analyzer generates a low-frequency component signal and a high-frequency component signal from an input signal. The...
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7085195 |
Method for detecting earth formation fractures by seismic imaging of diffractors
A method is disclosed for seismic imaging of subsurface diffractors. The method includes performing migration velocity analysis on a seismic time record section and depth migrating the time section...
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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...
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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...
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6982928 |
Seismic P-wave velocity derived from vibrator control system
P-wave velocity in a near-surface region of a land area is estimated from a combination of seismic data based upon waves in the near-surface region generated in response to a shock in each of a...
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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...
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6898147 |
System for estimating azimuthal variations in seismic data
The invention comprises a system for processing seismic data to estimate time shift resulting from velocity anisotropy in the earth's subsurface. A gather of seismic data traces is formed and...
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6898148 |
Multi-step receiver-motion compensation
The present invention provides methods to be used in seismic data processing to address problems encountered during data acquisition. The present invention provides a multi-step process to reduce...
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6826501 |
Method and apparatus for estimating water bottom reflection time difference
The present invention provides a method for reducing water bottom reflection time differences. The method includes selecting a plurality of trace groups, each trace having an offset from a midpoint...
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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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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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6208587 |
Method of detecting seismic events and for detecting and correcting geometry and statics error in seismic data
Methods are provided for automatic detection of linear seismic events and the detected events are used in correction of statics and geometry error. According to an example embodiment, a method is...
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6067275 |
Method of analyzing pre-stack seismic data
A method for using S-waves recorded at sea floor to determine anellipticity relating to at least one rock substrate is provided. In particular the method comprises identifying an S-wave event in...
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6021094 |
Method of migrating seismic records
The present invention provides a method of migrating seismic records that retains the information in the seismic records and allows migration with significant reductions in computing cost. The...
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6002642 |
Seismic migration using offset checkshot data
A method of migrating seismic data using offset checkshot survey measurements. The offset checkshot survey measurements involve raypaths similar to the migration raypaths for the seismic data, and...
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5999488 |
Method and apparatus for migration by finite differences
An improved method for eliminating reflections from artificial model boundaries encountered in finite-difference acoustic wave propagation computations is based on applying two different boundary...
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5999487 |
Seismic reflection data acquisition and processing method and device for prospecting in tectonically complex environments
A seismic reflection data acquisition and processing method and device for prospecting in tectonically complex environments are disclosed. In particular, the seismic reflection data acquisition and...
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5999489 |
High vertical resolution crosswell seismic imaging
A method for producing high vertical resolution seismic images from crosswell data is disclosed. In accordance with one aspect of the disclosure, a set of vertically spaced, generally horizontally...
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5991237 |
Method for the determination of migration velocities in seismic processing
A method for the determination of migration velocities in seismic processing in which a blasting point S is associated with receivers (R 1 to R n ) which are separated by offsets such that in a...
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5982707 |
Method and apparatus for determining geologic relationships for intersecting faults
A novel fault framework method and apparatus automatically computes the relationships between intersecting fault surfaces. When faults are loaded into the novel fault framework apparatus, all...
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5978313 |
Time synchronization for seismic exploration system
A system and method for synchronizing collection of seismic data used for seismic surveys. In one embodiment, positioning signals received from a positioning system, such as the Global Positioning...
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5978314 |
Method for determining seismic velocities
A method for determining a substantially optimal NMO velocity function for use in stacking a CMP gather of seismic data traces. The method begins with an initial estimate of the NMO velocity...
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5742560 |
Seismic imaging using wave equation extrapolation
A method for producing seismic images from seismic data obtained from two different datums. Traveltimes between the two datums are determined from either measurements or an assumed velocity field....
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5726951 |
Standoff compensation for acoustic logging while drilling systems
A standoff compensation system is disclosed for use in an acoustic LWD system. An acoustic transducer is provided to measure the standoff distance between the logging tool and the borehole wall....
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5596547 |
Prestack seismic migration
A method of prestack time migration based on the principles of prestack Kirchhoff time migration that can be applied to both 2-D and 3-D data. Common scatter point (CSP) gathers are created as an...
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5587942 |
3D wave equation migration of a 2D grid of seismic data
A method for three dimensional migration of a two dimensional grid of seismic data. The method involves computation of three dimensional time-dip functions at the intersections of lines in the...
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5579281 |
Method of improving an estimate of seismic wave propagation velocities by focusing analysis
The invention relates to a method of processing seismic data in which a volume of raw focusing data is constituted by downwards extrapolation of seismic data obtained by means of at least one...
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5570321 |
Seismic velocity model optimization method using simulated annearling to determine prestack travel-times
A method of determining a reference seismic velocity model that includes lateral and vertical variations in a stratified subterranean medium is disclosed. The invention recognizes that each unknown...
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5548562 |
Method for synchronization of systems for seismic surveys, together with applications of the method
A method for the synchronization of systems for seismic surveys, wherein the systems are composed of subsystems and may be land-based or marine, consists in the survey system being supplied with an...
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5500832 |
Method of processing seismic data for migration
Disclosed is a technique for processing seismic data to enable the data to be migrated without stacking. Seismic data provided in common midpoint gathers are converted to a domain defined in terms...
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5426618 |
Method of high resolution and high SNR data acquisition for probing using pulse-compression
Excellent likeness of impulse response function r o (t) of a given linear space is obtained by exciting the space through a transmitting transducer with a compressible probing signal x(t) which is...
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5392255 |
Wavelet transform method for downward continuation in seismic data migration
A depth migration method for seismic data involves a depth migration in the omega-x domain with an added transform in the wavelet domain. The input to the migration is one spike at a given time and...
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