Method of layer stripping to predict subsurface stress regimes

Details Method of layer stripping to predict subsurface stress regimes Method of layer stripping to predict subsurface stress regimes

1990-06-26

1991-10-22

Moskowitz, Nelson

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 31, 367 51, 364421, G01V 136, G01V 140

Patent

active

050602039

ABSTRACT:
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 analyzed, and time lags between fast and slow split shear wave are determined. Natural polarization directions of and time lags between the split shear waves in an upper layer are determined above the shallowest depth where data cues suggest polarization changes take place. Source and receiver axes of the data below the depth of polarization changes are rotated by an azimuth angle, to bring the axes into proper aligment. A static time shift is then applied to eliminate the time lag in the upper layer above the depth where polarization changes were indicated.

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