Procedures to invert P-wave and P-Sv wave reflectivity for underlying P- and S-wave velocity have been developed in the past. P-wave inversion has advanced to the stage of commercial 3-D seismic packages. We propose to extend the 3-D P-wave inversion procedure to that of S waves. The S-wave inversion will use two processes: a post-stack P-Sv trace inversion for S velocity and a pre-stack coupled P and P-Sv inversion for both velocities.
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