The SEG salt model was used to test Salvo for 3D prestack depth migration. Since the salt model is synthetic, the image can be compared with the velocity model to determine the accuracy of the migration algorithm. To the right and below are images created by Salvo using the SEG salt model data. The data was downloaded from the SEG salt model website. The extracted data was not one of the pre-built Classic data sets, but was defined and retrieved for our selected acquisition geometry. Each shot was collected on a receiver grid of 201x201 with an inline and crossline spacing of 20m. The shot was placed in the center of the receiver grid. Forty-five shots were collected over 12,000m by 12,000m of the velocity model (the velocity model has a spatial domain of 13,500m by 13,500m), and the maximum fold is 15. For more details see our presentation at the SEG `97 Workshop on the SEG Salt Model.

The migration was completed on the Intel Paragon at Sandia National Laboratories. The number of nodes varied from 32 to 128 nodes. With 64 nodes, a single shot could be migrated in approximately 40 minutes. Each shot file was ~100 MB in size.

Movies

Movie showing wave propagation in the SEG/EAGE Salt model
     MPEG Video (2 MB)

Movie showing the velocity model of the SEG/EAGE Salt model
     MPEG Video (3 MB)

Movie showing the Salvo image of the SEG/EAGE Salt model
     MPEG Video (3 MB)

Curtis C. Ober

Last modified: October 9, 1998