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Class 367/51 - Dynamic timing correction


Subclass of Class 367 - Communications, electrical: acoustic wave systems and devices
Definition: Subject matter wherein the amount of correction or control
No. of patents: 49
Last issue date: 11/09/2010


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NumberTitleIssue Date
7830747Method for multi-azimuth prestack time migration for general heterogeneous, anisotropic media
Three data subsets are obtained in three selected azimuthal directions from seismic data in heterogeneous, anisotropic media. Azimuthal velocities are determined for each of the data subsets. A linear system of equations in the three selected azimuthal directions an...
11/09/2010
7733741Method for reducing 3-D migration operator to 2-D migration operator for inhomogeneous media
Time slices of seismic data are transformed from rectangular space-time domain to cylindrical space-time domain. 2-D seismic migration is performed on the transformed data for each radial direction. Slices of the migrated data are inverse transformed back to the rec...
06/08/2010
7701804Method and constructing a model of a heterogeneous medium described by several parameters from data expressed in different time scales
A method for constructing a model representative of a heterogeneous medium from data expressed in different time scales with application to hydrocarbon characterization. The method first estimates sequentially, from the data expressed in each different time scale, p...
04/20/2010
7525874Method for converting seismic data from the time domain to the depth domain
A method is used to convert seismic data between bounding upper and lower surfaces in the time domain to the depth domain. An upper depth surface corresponding to the upper time surface is determined, either from well data or by time-depth conversion of the upper ti...
04/28/2009
7388808Method 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 demigrated, and post-stack depth migration is then performed on the demi...
06/17/2008
7355923Seismic 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 plurality of traces, e.g., collected from a plurality of source and r...
04/08/2008
7321526Method 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 groups, at least one trace in each group sharing a common midpoint wi...
01/22/2008
7257492Handling 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
7167414Amplitude 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. Takeoff and emergence angles are accurately calculated based on a model of ...
01/23/2007
7065004Horizon-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 the migrated seismic data are selected. Residual migration velocity a...
06/20/2006
7039526Method for downward extrapolation of pre-stack seismic data
A set of pre-stack seismic data is downward extrapolated, by first determining a migration interval in the seismic data set. A maximum error criterion is selected for the migration interval. A maximum relative error in phase calculated as a function of frequency, pr...
05/02/2006
6920084Offset 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 mapping the migrated seismic data to correct their respective offsets wh...
07/19/2005
6898147System 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 selected seismic data traces included in said gather within selected time ...
05/24/2005
6898148Multi-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 aliasing of seismic data along time slices. ...
05/24/2005
6819628Wave migration by a krylov space expansion of the square root exponent operator, for use in seismic imaging
Seismic imaging apparatus for receiving data propagated through sub-surface structure from a seismic source to at least one seismic receiver and forming an image therefrom, the apparatus comprising: an imager for forming an initial image from said data including ini...
11/16/2004
6816435Method for estimating the position of a drill
The present invention relates to a method for estimating the position and trajectory of a drill during drilling of boreholes in rock. The method comprising the steps of determining the starting position of the drill bit and recording the received transient seismic w...
11/09/2004
6798714Method of performing stretch-free normal moveout (NMO) and stacking of seismic traces
A method of performing normal moveout (NMO) correction and stacking of a common-midpoint (CMP) gather of seismic traces in a manner that avoids NMO stretch is disclosed. A CMP gather without NMO correction is modeled as the sum of a series of short overlapping time ...
09/28/2004
6791900Method of calculating a throw volume for quantitative fault analysis
A method of calculating a throw volume corresponding to a seismic data volume. A range of time shifts and a search direction for the seismic data volume are selected. A data location separation and a vertical time window are also selected. A cross-correlation is cal...
09/14/2004
6681184System 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 selected seismic data traces included in said gather within sel...
01/20/2004
6466873Method of extended recursive f-k migration
A method of migrating seismic event data in the presence of a vertically time-varying velocity field defined by a migration velocity function is provided. The method comprises approximating a migration velocity function by constant stepwise stage velociti...
10/15/2002
6061301Filtering of overburden azimuthal anisotropy effects from 3D seismic survey signals
A method and system for correcting seismic survey signals for separating and correcting for the effects of azimuthal anisotropy caused by the overburden, rather than the subsurface reflectivity, is disclosed. Following an initial estimate and normal moveo...
05/09/2000
5999488Method 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 conditions at the artificial boundary. In this method one b...
12/07/1999
5978314Method 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 function for the CMP gather. This initial estimate is typically ...
11/02/1999
5808964Processing 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 seismic reflection prospecting operations in a subsurface ...
09/15/1998
5724310Traveltime 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, the angular separation between the rays being equal to π/...
03/03/1998
5663928Method for analysing and processing seismic reflection data for the determination of a high resolution spatial velocity field for hyperbolicity correction
A method of analysing and processing seismic reflection data for the determination of a high resolution spatial hyperbolicity correction velocity field. The method is characterised in that: for the set of normal moveout-corrected gathers, the maximum values of...
09/02/1997
5648937Method and apparatus for correlating geological structure horizons from velocity data to well observations
A method and apparatus for adjusting the results of a seismic survey according to well log data obtained from wells within the survey region is disclosed. The disclosed method operates on one seismic horizon at a time, and first applies well log data, arr...
07/15/1997
5640368Migration 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 those lying upon that portion of the Kirchhoff summation curve...
06/17/1997
5596547Prestack 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 intermediate step for each output migrated trace. Normal mo...
01/21/1997
5530679Method for migrating seismic data
An approximate method for imaging seismic data that originates from steeply dipping or overturned strata. The method provides a viable alternate approach to the generalized f-k migration that does not rely explicitly on some form of perturbation series ex...
06/25/1996
5500832Method 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 of the travel time and the first power of velocity of refl...
03/19/1996
5343440Geopressure analysis system
Seismic data is combined with well log data to generate a two-dimensional geopressure prediction display; this permits deviated and horizontal well planning plus lithology detection. Shale fraction analysis, compaction trend, and seismic velocity may be a...
08/30/1994
5243563Seismic depth imaging
The mispositioning of reflectors in a velocity analysis enhanced common-offset time migrated image is corrected by carrying out inverse migration on the time image, followed by zero-offset depth migration....
09/07/1993
5128899Method for sharpening prestack depth migration images by removing residual moveout from common image point gathers before stacking
A method for removing residual moveout includes sorting the results of common offset depth migration into common image point gathers. A subset of image point gathers are selected for analysis. Each common image point gather is separated vertically into wi...
07/07/1992
50797033-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 shot lines. For each of the shot lines, a two-dimensional mig...
01/07/1992
5060203Method of layer stripping to predict subsurface stress regimes
A method for analyzing seismic shear wave data, using a layer stripping technique, to predict subsurface stress regimes is disclosed. Polarization directions of shear wave data, from either a vertical seismic profile or from surface reflection data, are a...
10/22/1991
5060204Method of layer stripping to determine fault plane stress build-up
A method for analyzing seismic shear wave data, using a layer stripping technique, to determine fault plane stress build-up is disclosed. Polarization directions of shear wave data, from either a vertical seismic profile or from surface reflection data, a...
10/22/1991
4964089Method for derivation of internal velocities from post-migration parts
A method for derivation of interval velocities from post-migration parts first includes the step of determining the apparent depth and slope of an event. The apparatus depth of an event is measured. The travel time of the recorded reflection for a particu...
10/16/1990
4964088Method for tomographically laterally varying seismic data velocity estimation
A process for tomographic development of seismic section data having known source and receiver positions. The process employs forward modeling to estimate travel times of the rays through the earth medium. The medium is assigned a cellular constitution an...
10/16/1990
4894809Method for bin, moveout correction and stack of offset vertical seismic profile data in media with dip
Seismic energy is generated at a multiplicity of source offsets from a borehole and offset VSP data is collected by an acoustic detector at a multiplicity of geophone depths for each source offset. The recorded data is sorted into Zero Source-Receiver (ZS...
01/16/1990
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