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Document Title 

8953411 
Apparatus and method for imaging a subsurface using frequencydomain elastic reversetime migration
Provided are an apparatus and method for imaging a subsurface using frequencydomain reversetime migration in elastic medium. The subsurface imaging method represents a frequencydomain imaging... 

8947976 
Harmonic attenuation using multiple sweep rates
A technique includes generating seismic sweep sequences. Each of the seismic sweep sequences has an associated sweep rate. The technique includes varying the sweep rates to reduce harmonic... 

8902708 
System and method for seismic beam formation that accounts for equipment misalignment
Seismic data representing the propagation of seismic energy through a geologic volume of interest is processed. The seismic energy propagates through the geologic volume of interest from one or... 

8559271 
Systems and methods for seismic data acquisition employing asynchronous, decoupled data sampling and transmission
Systems and methods for asynchronously acquiring seismic data are described, one system comprising one or more seismic sources, a plurality of sensor modules each comprising a seismic sensor, an... 

8358562 
Measuring and modifying directionality of seismic interferometry data
Methods and apparatuses are disclosed for replacing the individual receivers used with a seismic interferometry process with an array of seismic receivers and then manipulating the array data in... 

8325561 
Digital elevation model for use with seismic data acquisition systems
A seismic data acquisition system includes a controller, a plurality of sensor stations and a plurality of seismic sources. Each sensor station includes a sensor coupled to the earth for sensing... 

8284630 
Annularsum transform of irregularly sampled seismic data
A method for interpolating irregularly sampled seismic data, including receiving seismic data acquired at irregularly spaced seismic sensors in a survey area, defining a plurality of regularly... 

8279707 
Fusing geophysical data representing a geophysical space
Geophysical data representing at least first and second overlapping geophysical spaces may be aggregated. A first set of geophysical data representing the first geophysical space and a second set... 

7599798 
Migrating composite seismic response data to produce a representation of a seismic volume
A subterranean structure is characterized using composite seismic response data received from a plurality of sources. Phase encoding is applied to the data in which phase shifts are selected based... 

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... 

6868038 
Seismic method of performing the time picking step
The present invention provides a method of performing the time picking step in a VSP (vertical seismic profile) survey. In a preferred embodiment of the invention the time picking step is carried... 

6859416 
Apparatus and method for analyzing correlation between geophysical data and seismic data, geophysical data monitoring apparatus and method, and earthquake monitoring method
The present invention relates to an apparatus and a method for analyzing the correlation geophysical data and seismic data, physical data monitoring apparatus and method, and an earthquake... 

6836448 
System and method for seismic wavefield separation
A system and method of creating a filter for use with locally dense seismic data is disclosed. The method includes obtaining survey geometry characteristics from a locally dense seismic survey. A... 

6757216 
Method for post processing compensation of amplitude for misaligned and misstacked offset seismic data
A method for assessing the suitability of seismic data for quantitative amplitude analysis, where the concern is excessive residual normal moveout (RNMO). The invention uses a near offset stack... 

6345108 
Multivariable statistical method for characterizing images that have been formed of a complex environment such as the subsoil
The invention is a statistical method for analyzing exploration data associated with image elements showing physical properties of a complex environment such as subsoil for identifying the spatial... 

6317384 
Method for geophysical processing and interpretation using seismic trace difference for analysis and display
A method for identifying faults and stratigraphic features within seismic data without interpreter bias by processing seismic data to identify the minimum difference between seismic traces. Large... 

6195028 
Amplifier gain control method using conditional updating
In a peak detection system having a variable gain amplifier (VGA), a counter is initialized and a countdown is triggered. Each time a qualified peak is detected, the counter is reinitialized. If... 

6091668 
Static marine seismic system and method
A system and method for periodically providing information about subsurface formations in a marine environment using a nontowed seismic signal source (3) and a static array of seismic signal... 

6081482 
Semirecursive imaging under complex velocity structures
A computationally efficient semirecursive Kirchhoff migration algorithm is capable of obtaining accurate images of complex structures in complex geological environments which commonly give rise... 

6075752 
Method for exploring an environment with a complex tectonics
The method consists in building a common midpoint gather of seismic traces of which the CMP point is said given point, subjecting the traces of this gather to dynamic and/or static corrections,... 

6052333 
Method for seismic antenna illumination of subterranean feature for display and evaluation
Monofrequency continuous wave signals of long duration are used as inputs form sources of known characteristics and location. These signals are reflected off subterranean features and serve to... 

6028820 
Method for determining the presence of fluids in a subterranean formation
A method for seismic data interpretation for the purposes of identification of oil, gas and water accumulation locations and delineation of their contours uses a model of discrete media with... 

6009043 
Crosswell connectivity mapping including separation of compressional and shear wave energy
A method of determining the continuity of earth formations between wellbores by analyzing seismic energy imparted to the formations. The energy is imparted to the formations at a plurality of... 

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... 

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 (R1 to Rn) which are separated by offsets such that in a given... 

5903515 
Spatial dealiasing of the 3D Kirchhoff DMO operator
A method for generating an unaliased 3D 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... 

5892732 
Method and apparatus for seismic signal processing and exploration
A method and apparatus for the exploration of hydrocarbons comprising the steps of: obtaining a set of seismic signal traces distributed over a predetermined threedimensional volume of the earth;... 

5677892 
Unaliased spatial trace interpolation in the fk domain
A computeraided method for providing a dealiased output data set dL (t,xL,yL) from a spatially aliased, threedimensional, input data set of known seismic signals, a(t,x,y), where L is an... 

5661697 
Method and apparatus for detection of sand formations in amplitudeversusoffset seismic surveys
A method and apparatus for analyzing amplitudeversusoffset (AVO) seismic data to distinguish sand formations, such as Morrow sands, from limestones and other similar intervals, is disclosed. For... 

5648937 
Method 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... 

5586082 
Method for identifying subsurface fluid migration and drainage pathways in and among oil and gas reservoirs using 3D and 4D seismic imaging
The invention utilizes 3D and 4D seismic surveys as a means of deriving information useful in petroleum exploration and reservoir management. The methods use both single seismic surveys (3D)... 

5475589 
System for evaluating seismic sequence lithology and property, and for evaluating risk associated with predicting potential hydrocarbon reservoir, seal, trap or source
A method for translating seismic time data via seismic depth data to seismic depth/lithology data, enabling reducedrisk location of hydrocarbons. Reducing dry hole risk is accomplished by... 

5463594 
High frequency retention seismic survey method
Methods for generating seismic data and creating a seismic section are disclosed in which the difference in offsets between stacked traces is limited. 

5214614 
Seismic directional sensor for solidborne sound
A seismic directional sensor for solidborne sound has at least one geophone with pronounced directional characteristic. The measuring electrical vibration signals, which are obtained at different... 

5206837 
Method for compensating for the effect of irregular spatial sampling of seismic wavefields
This invention provides a method for compensating for the deleterious effects of irregular spatial sampling of seismic data. The imbalance caused by sparse sampling is corrected by decomposing a... 

5193077 
Method and apparatus for improved seismic prospecting
An improved method and apparatus for conducting seismic prospecting is provided wherein more accurate estimates of the source wavelet can be achieved. Receivers (202) detect pulses at vertically... 

5182729 
Reduction of sideswipe noise from seismic data by null steering
Disclosed is a seismic surveying and data processing method to filter from seismic data any energy contributions that are not in the seismic line of profile. The surveying method requires a... 

5153857 
Method for selecting seismic traces for higher efficiency of prestack two dimensional or three dimensional depth migration
A method for improving the efficiency of prestack depth migration includes the steps of deleting a portion of the received data to obtain a representative remaining portion. All the shots are... 

5136551 
System for evaluation of velocities of acoustical energy of sedimentary rocks
An improved comprehensive system for definition of velocities of acoustic energy of sedimentary rocks is provided. First, geophysical exploration data available in the prior art is collected and... 

5103429 
Homeomorphical imaging method of analyzing the structure of a medium
A method of analyzing the structure of a medium particularly useful in seismic prospecting, by generating seismic data represented by recorded traces corresponding to a plurality of source and... 

5084844 
Efficient method for storing seismic traces on disk
A method by which portions of a seismic data set are deleted since no meaningful data is contained in that portion contains the step where a line of data is examined, gather by gather, to... 

5083297 
Method of improving the seismic resolution of geologic structures
A method for improving the seismic resolution of geologic structures is disclosed. Refracted wave arrivals are gathered into common midpoint trace gathers. Data representations originating inside... 

5058079 
Geophysical exploration using velocity picking from trial velocity function sorted timecoherency traces
Timecoherency traces generated during velocity analysis are displayed in panels where each panel contains traces representing a single selected trial stacking velocity function and a plurality of... 

5008861 
Geophysical exploration by automatically picking and associating stacked seismic sections with regional coherency peaks of velocity spectra
Regional velocity spectra coherency peaks are associated with peak events on a stacked seismic section of CMP gathers and used for editing siesmic data. In addition, travel time and spatial... 

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... 

4964102 
Method for enhancing and evaluating seismic data
A method is provided for enhancing processing and evaluating seismic data. More particularly, a novel method is described for enhancing and evaluating common depth point seismic data. Common depth... 

4944036 
Signature filter system
A filtering system is provided for acquiring and processing signals using a sampled filter for signal separation and signal enhancement; such as for determing locations, distances, and times in a... 

4935905 
Method and apparatus for seismic exploration
A geophone is disclosed which includes at least two transducers having axes which are perpendicular to each other for generating Cartesian coordinate signal components in response to at least... 

4935903 
Reinforcement of surface seismic wavefields
A marine seismic reflection prospecting system attenuates coherent noise through reinforcement of primary reflection data by the addition of corrected ghost reflection data. The system includes a... 

4933912 
Three dimensional seismic prospecting method
A 3D seismic prospecting method is provided which employs an areal array of sources and receivers by which seismic traces are generated. The areal array is segregated into a plurality of shells... 