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Matching P wave and shear wave sections in seismic exploration

Patent ·
OSTI ID:6107378
; ;
The method is described of determining the ratio of the velocities of compressional and shear waves in seismic exploration comprising: recording compressional and shear wave seismic traces representing the reflection of seismic energy from subsurface formations; cross-correlating a window of one of the compressional and shear wave seismic traces against a window of the other to produce a first set of correlation coefficients as a function of time; time shifting the window through a plurality of time increments; repeating the step of cross-correlating for each of the plurality of time increments to produce a plurality of additional sets of correlation coefficients as a function of time; plotting the first and plurality of additional sets of correlation coefficients in parallel columns as a function of time to provide a two dimensional grid, each point on the grid being the correlation coefficient between a point on one trace of the compressional and shear wave seismic traces and a point on the other of the traces; determining a likelihood function along a plurality of paths, the likelihood function representing the correlation coefficients at the points along each of the paths, each of the paths representing different profiles of the ratios of compressional and shear wave velocities; and selecting the path having the maximum likelihood function as indicating the correct ratio of the velocities of compressional and shear waves.
Assignee:
Mobil Oil Corp., New York, NY
Patent Number(s):
US 4686657
OSTI ID:
6107378
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
58 GEOSCIENCES
580203 -- Geophysics-- Geophysical Survey Methods-- (1980-1989)
DATA PROCESSING
EXPLORATION
GEOLOGIC DEPOSITS
GEOPHYSICAL SURVEYS
GRAPHS
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PETROLEUM DEPOSITS
PHASE VELOCITY
PROCESSING
REFLECTION
RESOURCES
SEISMIC P WAVES
SEISMIC S WAVES
SEISMIC SURVEYS
SEISMIC WAVES
SURVEYS
TIME DEPENDENCE
VELOCITY