Method for using P-S converted waves as a subsalt imaging tool

Details Method for using P-S converted waves as a subsalt imaging tool Method for using P-S converted waves as a subsalt imaging tool

1991-06-07

1994-04-26

Hayes, Gail O.

Boots, shoes, and leggings

367 53, G01V 136

Patent

active

053072685

ABSTRACT:
A hybrid velocity model is used to image the subsalt reflector. A method for imaging subsalt reflectors includes receiving seismic data and depth migrating the raw data. Generated seismic P-waves are assigned a first P-wave velocity for travel outside a salt wedge. Prior to entering the salt wedge, the wave is treated as a compressional wave. Upon entering the salt wedge, the P-wave is treated as a converted S-wave and a corresponding S-wave velocity is assigned to the converted wave. When the converted S-wave exits the salt wedge, it is again converted, this time back to a P-wave. As this wave travels through the subsalt layer to a reflector interface, it is assigned a P-wave velocity. Thus, a velocity model which includes both P-wave and S-wave velocities is used to image reflectors below salt wedges.

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