Surface and crosswell seismic prestack Gaussian beam depth migration

To demonstrate surface seismic prestack Gaussian beam depth migration, I generate the common-shot gather of Figure 10(a) by ray tracing, modeling a 15-degree dipping reflector in a medium with a constant velocity of 3. The source-receiver near offset is 0.2. Figure 10(b) is the depth image generated by the above stated procedure with the same Gaussian beam computation parameters as in the poststack case. It shows that the method works.

Crosswell seismic prestack Gaussian beam depth migration works the same way. The only difference is in the location of the source.

 

CSG15Himage
Figure 10 (a) Common-shot gather generated by ray tracing modeling a 15-degree dipping reflector in a medium with a constant velocity of 3. (b) Subsurface depth reflectivity image reconstructed by prestack Gaussian beam depth migration. The source is at 0.4, and the source-receiver near offset is 0.2.