Determining orientation of vertical fractures with well logging

Details Determining orientation of vertical fractures with well logging Determining orientation of vertical fractures with well logging

1993-08-10

1995-03-28

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Seismic prospecting

Land-reflection type

367 25, 367 35, 181102, 181106, 181105, 166250, G01V 140

Patent

active

054023920

ABSTRACT:
The orientation of vertical fractures in subsurface rock formations is determined. A cross-dipole logging tool collects four-component shear-wave seismic data through a formation interval of interest in a subsurface formation adjacent a well bore. A gyroscope is typically provided to indicate compass orientation of the logging tool. The collected seismic data are then transformed within a time window containing arrivals of the shear waves to a new coordinate system within which the motion of the shear waves becomes linear. In the new coordinate system, the shear wave data are processed to determine the presence and orientation of fractures in the formation.

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