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5572483 
Method of reducing noise in seismic signals by adaptive filtering of a noise reference
A method of reducing effects of noise in seismic signals generated by a plurality of seismic sensors at spaced apart locations from a seismic source is disclosed. Each of the signals is... 

5570321 
Seismic velocity model optimization method using simulated annearling to determine prestack traveltimes
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... 

5537365 
Apparatus and method for evaluation of picking horizons in 3D seismic data
Apparatus and method are disclosed for use with a horizon picking method for 3D seismic data. Variables such as picking method, whether simple or iterative, score required of an iterative method... 

5532976 
Curvedray replacement dynamics
A method of geophysical prospecting wherein nonhyperbolic distortion is reduced from marine seismic data, or land seismic data over a low seismic velocity layer, is disclosed. The method comprises... 

5515335 
Seismic trace overburden correction method
A method for generating improved displays of seismic data by processing seismic amplitude versus offset data to correct for overburden effects. Analytic traces are calculated for the zero offset... 

5508973 
Method for determining the principal axes of azimuthal anisotropy from seismic Pwave data
A method for measuring the principal axis of fractureinduced formation anisotropy. Amplitude vectors are measured from CMP gathers oriented along inline and crossline wavefield trajectories.... 

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. 

5438169 
Apparatus and method for determining the quality of clamping of a borehole seismic sensor system to the wall of a wellbore
The invention is a method and apparatus for measuring the quality of acoustic coupling between a wellbore wall and a borehole seismic sensor system. The system includes the steps of positioning... 

5410517 
Method for cascading sweeps for a seismic vibrator
A method for cascading or linking seismic vibrator sweeps to form a cascaded sweep sequence. According to the method, a first cascaded sweep sequence is generated containing N sweep segments... 

5408441 
Method for seismic exploration in artic regions
A method for obtaining seismic data in frigid regions without interference from flexural ice waves. In an exemplary embodiment, seismic data is produced by using an energy source to generate a... 

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,... 

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... 

5383114 
Method for displaying a volume of seismic data
A method for displaying seismic attributes in an open threedimensional format is provided. The conventional twodimensional variableamplitude traces that represent the magnitude of a selected... 

5319554 
Method for data interpolation and signal enhancement
The method sequentially determines dips and corresponding estimated dip components of traces in a panel of data. The method can be applied to any data which can be represented as a function of two... 

5311484 
Method and apparatus for petroleum and gas exploration
In the exploration for petroleum or natural gas, drilling targets are identified by locating local maxima of horizontal gradient in the topofgeopressure surface of a region of exploration. The... 

5309406 
Method of processing seismic data
A method of processing seismic data wherein seismic data signals having a first part which shows a slow variation in offset and a second part which shows a slow variation in midpoint, is modelled... 

5297108 
Seismic velocity estimation method
A method for detecting errors in estimated seismic velocities used in a normal moveout correction of a gather of traces selected from conventional, common midpoint seismic data. Zero offset... 

5293352 
Method for removing noise due to near surface scatterers
A set of raw common shot gathers are resorted as common receiver gathers. The wavefield envelopes from the common receiver gathers are migrated using one half the nearsurface velocity to provide... 

5287328 
Method for removing random source and receiver noise from seismic traces
Recorded seismic traces are gathered into common offset groups. Within each group, the traces are arranged according to shot point number. Mean and standard deviations are determined for each... 

5257242 
Method of geophysical exploration
A method of geophysical exploration is described for transforming qualitative descriptors of seismic data into a quantifiable decisionmaking tool to estimate the formation properties as well as... 

5241514 
Identifying, characterizing, and mapping of seismic noise
The present invention provides novel methods for identifying, characterizing and mapping seismic noise as an aid in evaluating and enhancing seismic data. In particular, an array of seismic... 

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. Signalplusnoise within the selected gate is extracted from the array of seismic traces.... 

5226019 
Method of geophysical exploration
An improved method of stratigraphic analysis of geophysical data is provided. In one embodiment seismic data are transformed into one or more instantaneous attributes descriptive of the wavelike... 

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... 

5200929 
Method for estimating pore fluid pressure
A method for estimating pore fluid pressure in a subterranean formation is disclosed for use in drilling wells. A pair of velocityeffective stress relations are used to compute pore fluid... 

5198979 
Seismic migration of multiprocessor computer
In a preferred embodiment of the present invention, methods are provided for Kirchhoffmigrating seismic data using a parallel computer. The methods of the present invention preferably use a... 

5189644 
Removal of amplitude aliasing effect from seismic data
Balancing of signal amplitudes in recorded seismic data prior to its transformation from its original domain (such as offsettime, or XT) to a different domain (such as frequencywave number, or... 

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... 

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... 

5177709 
Method for determining velocity and confidence level of acoustic waves in penetrable ground
Seismic traces are singularly acquired, digitally converted, normalized according to mean and amplitude, visually displayed for qualitative evaluation, and recorded in conjunction with relevant... 

5173880 
Method of generating seismic wavelets using seismic range equation
A method of deterministically computer generating a model of a response voltage waveform of a seismic receiver employed in a seismic, particularly marine, data gathering system, the model... 

5157637 
Method of structural traveltime tomography
The invention relates to a method of structural traveltime tomography which uses mismatched image information observed on common image point gathers to determine the precise location of near... 

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... 

5144590 
Bed continuity detection and analysis using crosswell seismic data
Continuity of subsurface formations or beds in the earth between existing wells is investigated. Seismic energy is sent from a seismic source in one of the wells at various selected fixed depths.... 

5144589 
Method for predicting formation porepressure while drilling
A method for predicting the formation porepressure ahead of the drill bit while drilling is disclosed. During the drilling process, the drill bit impacting the earth generates a seismic signal.... 

5138583 
Noise attenuation method
A method for attenuating coherent and incoherent noise in seismic signal data is provided. Seismic signal data is transformed from a timespace domain using a Radontransform domain. In the... 

5136550 
Method for estimating the residual source of receiver coordinates from CMP gathers
This is a method for optimizing the coordinates of transducer stations involved in a common mid point gather. Relative reflectiondata misalignments between the traces of the gather are attributed... 

5136552 
Metod of geophysical exploration
A method of geophysical exploration is provided for identifying and evaluating stratigraphic prospects associated with steplike changes in elastic impedance from gradational changes in elastic... 

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... 

5134590 
Method and apparatus for correcting the response of seismic sensors to an emission signal that does not have the same shape as a reference signal
A method of correcting a seismic signal s(t) provided by a vibration sensor (100) in response to at least one emission signal F(t) produced by a least one seismic vibration generator (200). The... 

5132938 
Adjusting seismic data to tie to other data
A method to adjust a common subsurface feature on seismic traces associated with line misties is provided so that the seismic traces are consistent about the common subsurface feature. The method... 

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... 

5081612 
Methods for estimating the burial conditions of sedimentary material
Methods of geophysical exploration are provided for estimating the burial conditions of sedimentary material in a selected basin. The burial conditions can include measures of porosity, lithology,... 

5079749 
Seismic raytracing method and apparatus
A seismic raytracing model performs economic exploration of subsurface structures, which 1) allows amplitude, frequency, mode, and other "synthetic filtering" of the model's calculations and 2)... 

5073875 
Method of enhancing geophysical data
A method of enhancing geophysical data comprising processing the geophysical data into ordered gathers of seismic signals, transforming the seismic signals of each ordered gather into synthetic... 

5062086 
Calculation of raypaths and wavepaths from traveltime tables for the tomographic estimation of transmission velocities
A method for calculation of raypaths and wavepaths from traveltime tables for the tomographic estimation of transmission velocities includes picking the earliest traveltime of waves transmitted... 

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... 

5051960 
Method of removing records of multiple reflection events from seismic data
A method of removing multiple reflection events from seismic records is described. A shallow primary reflection event is used as a model for a deeper primary, and is distorted responsive to the... 