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7545704 |
Performing 3-D scatterer imaging from 2-D seismic data
A method for analyzing seismic data from a formation. The method may first receive two-dimensional (2-D) seismic data of a formation comprising a number of individual seismic lines acquired over an...
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7505362 |
Method for data regularization for shot domain processing
Method for interpolating aliased seismic data to generate shot records at regular shot points. The method involves sorting the data into common offsets to obtain the finer sampling in the...
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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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7453764 |
Method of imaging in an underground formations steep-sloping geologic interfaces, giving rise to prismatic reflections
A method of imaging in an underground formation one or more steep-sloping geologic interfaces, which are not necessarily in a plane, by forming with primary reflectors, which are not necessarily in...
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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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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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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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7110323 |
Method, system and apparatus for interpreting seismic data using duplex waves
A Method for Interpreting Seismic Data Using Duplex Waves is described. Whereas substantially horizontal boundaries are readily identified using conventional processing methods based on primary...
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6952379 |
Seismic method and apparatus for generating a semblance panel and computing the reflector dip
A method of generating a semblance panel comprises summing two or more gathers of traces. The dip of the reflector is taken into account in the summation process, and this prevents semblance peaks...
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6920084 |
Offset transformation to zero dip that preserves angle of incidence
A method and apparatus for compensating acquired seismic data for the presence of dipping events are disclosed. The method includes migrating the acquired, unstacked seismic data; and spatially...
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6681199 |
Peak time detecting apparatus and method
A product-sum operation portion for performing a product-sum operation (wavelet transformation) with respect to an input time-series signal by using as a base of integral a complex function in...
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6212477 |
Converted-wave analysis system and method
Method and systems are provided for processing c-wave data resulting in less sensitivity to errors in p-wave velocity analysis. Therefore, according to one aspect of the invention, a process is...
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6094621 |
Method for migration before summation
A method for determining migration before summation including recording seismic reflection traces, for constituting a collection of traces to be migrated before summation and without weight...
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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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6018499 |
Three-dimensional seismic imaging of complex velocity structures
Accurate and reliable traveltimes for a seismic exploration volume having a complex velocity structure are generated by selectively advancing a traveltime front at its minimum traveltime grid...
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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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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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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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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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5903515 |
Spatial de-aliasing of the 3-D Kirchhoff DMO operator
A method for generating an unaliased 3-D DMO operator using two dimensional sampling theory to the spatial traverse of the operator as well as to the temporal axis. First a continuous DMO operator...
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5812493 |
Method of representing the trajectory of at least one borehole in a space-time domain
A method for representing in a space-time domain the trajectory of at one borehole by: a) producing a velocity-depth model (4) tied to the borehole (1), geologically representative of said area...
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5808964 |
Processing method for obtaining zero-offset seismic data by depth domain stacking
The object of the method according to the invention is to synthesize zero-offset seismic data from data acquired within the scope of three-dimensional (or possibly two-dimensional) multiple-offset...
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5764514 |
Method for modelling kinematic seismic data processed with at least one motion operator
A method of modelling at least travel time and apparent dip from seismic data that has been processed by at least one migration operator comprising the steps of taking the mid-point (N 1 ) of a...
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5724310 |
Traveltime generation in the presence of velocity discontinuities
An array of output image points is distributed over a velocity model of a subsurface region of interest. A fan of rays is shot from each of a plurality of acoustic source points along the surface,...
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5724309 |
Method for geophysical processing and interpretation using instantaneous phase and its derivatives and their derivatives
A method for utilizing instantaneous phase and the derivatives of instantaneous phase as display and/or plot attributes for seismic reflection data processing and interpretation for two-dimensional...
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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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5717655 |
Method for providing uniform subsurface coverage in the presence of steep dips
A method for minimizing non-uniform insonification of subsurface formations in the presence of steep dips when advancing a swath of elongated parallel seismic streamer cables along a line of...
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5642328 |
Method for determining validity of seismic reflections below lateral velocity variations
A method for determining the reliability of time processed seismic reflection data near a significant velocity differential overhang includes displaying the seismic reflection data as a seismic...
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5640368 |
Migration velocity analysis using limited-aperture and monte carlo migration
Disclosed is a method for efficiently and accurately determining subsurface velocities for use in migration of seismic data. The method calls for restricting the number of traces considered to...
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5629904 |
Migration process using a model based aperture technique
A method for efficiently and accurately migrating seismic data recorded from an area of interest is disclosed. The method utilizes determining displacement values for every output sample in an area...
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5587967 |
Method for improvement of seismic sections
A method for improving seismic sections includes generating seismic signals at source stations, recording seismic traces at receiver stations and gathering the seismic traces as a first gather at a...
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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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5532977 |
Processing method for obtaining a stack section with zero offsets
A method and device for obtaining a zero-offset seismic section from a stack seismic section produced from stack traces recorded along a given line of survey, is disclosed. The present method and...
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5513150 |
Method of determining 3-D acoustic velocities for seismic surveys
A method of producing a velocity volume for a seismic survey volume, based on two-way time seismic data and process velocity data, is disclosed. Two-way time seismic data is loaded into a computer...
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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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5490120 |
Method of imaging overturned waves
An overturned wave is identified in initial seismic data and revised seismic data gathering parameters are calculated (e.g., a range of locations for a seismic source and detectors laterally...
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5450370 |
Quality assurance of spatial sampling for DMO
This invention provides a method for examining the geometry of the disposition of a plurality of sources and receivers over an area to be surveyed with a view to optimizing the array to avoid data...
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5307268 |
Method for using P-S converted waves as a subsalt imaging tool
A hybrid velocity model is used to image the subsalt reflector. A method for imaging subsalt reflectors includes receiving seismic data and depth migrating the raw data. Generated seismic P-waves...
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5285422 |
Method for compensating 3D DMO for the effects of an inhomogeneous earth
A three dimensional residual modeling operator is applied to seismic times that have been preprocessed by application of NMO and velocity independent DMO. The residual operator compensates for...
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5274605 |
Depth migration method using Gaussian beams
A process for depth migration of seismic wave information that has been derived from geological media that causes rapid lateral velocity variations in seismic waves. The process includes the step...
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5235555 |
Diving-wave migration using airy functions
In areas where the velocity gradient is strong or exhibits a significant positive curvature, the usual phase shift f-k migration methods cannot properly image overtuned dips due to diving waves. In...
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5233569 |
Modified residual migration of seismic data
A method is disclosed for a two-step residual migration of dipping seismic events. A first migration pass is done using a fully-vertically-variable but laterally-invariable migration velocity that...
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5189643 |
Method of accurate fault location using common reflection point gathers
The invention relates to a method for locating correct near vertical boundary or fault positions in a velocity model using common reflection point (CRP) gathers. Conventional migration velocity...
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5138584 |
Migration of seismic turning waves
A method for migrating seismic data for formations that are located in geological media that cause seismic waves to be refracted so substantially that the waves turn upward. The method includes the...
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5097452 |
Analysis of migration velocity by migration of velocity spectra
Velocity spectra are computed from unmigrated CMP gathers after correction for dip moveout. The velocity spectra are then migrated to their true spatial position. The migrated velocity spectra are...
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5089994 |
Tomographic estimation of seismic transmission velocities from constant offset depth migrations
A method for improving velocity models so that constant-offset migrations estimate consistent positions for reflectors includes tomographic estimation of seismic transmission velocities from...
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5079703 |
3-dimensional migration of irregular grids of 2-dimensional seismic data
A method and apparatus for deriving a three-dimensional seismic image from an irregular grid of two-dimensional seismic data is provided. The two-dimensional seismic data incldue a plurality of...
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4992996 |
Interval velocity analysis and depth migration using common reflection point gathers
A method for performing velocity analysis while eliminating the effects on weak signals caused by strong signals includes migrating each event of the pre-stack trace to a single location instead of...
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4987561 |
Seismic imaging of steeply dipping geologic interfaces
A method for determining the location of steeply dipping subsurfaces includes acquiring seismic reflection data, identifying select data which has characteristics indicating that the acoustic...
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