Communications – electrical: acoustic wave systems and devices – Seismic prospecting – Land-reflection type
Patent
1985-01-03
1987-08-11
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Seismic prospecting
Land-reflection type
367 40, 364421, G01V 136
Patent
active
046866574
ABSTRACT:
In seismic exploration, the ratio of the velocities of compressional and shear wave data is automatically determined by cross-correlating a compressional wave trace against a window of the shear wave trace to produce a set of correlation coefficients as a function of P wave time. The shear wave window is shifted by an increment of time. The steps of cross-correlating and shifting the window are repeated to form a grid of correlation coefficients. Points on the grid represent the correlation coefficients between a point on one trace and a point on the other trace. The path of maximum correlation coefficients, or maximum likelihood functions, through the grid identifies the V.sub.p /V.sub.s profile. This path is selected by a process which includes selecting the best path between two points and then increasing the number of points in the sequence until the best path through the grid is determined.
REFERENCES:
patent: 4422165 (1983-12-01), Thomas et al.
Forney, Jr., "The Veterbi Algorithm", Proc. IEEE, vol. 26, #3, 3/73, pp. 268-278.
"Fluid Saturation Effects on Dynamic Elastic Properties of Sedimentary Rocks", Geophysics, vol. 41, No. 5, pp. 895-921, Oct. 1976.
"Acoustic Character Logs and Their Application to Formation Evaluation", Journal of Petroleum Technology, Jun. 1963.
Dellinger J. A.
Goins Neal R.
Reilly Theresa A.
Gilman Michael G.
Hager Jr. George W.
Lobo Ian J.
McKillop Alexander J.
Mobil Oil Corporation
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