Figure shows the PS migration result, using the updated P velocity model and the given S velocity model. Figure shows three angle domain common image gathers for this migration result.
Figure 6 PS migration result with the updated P velocity model and the given S velocity model.
Figure presents the residual migration results keeping the value as 1, i.e, no changes in the P-velocity field, and a value of 0.98. Figure shows the angle domain common image gathers for the residual migration process. These angle gathers are at the same position as in Figure , however, they correspond to values of and .
Figure 8 PS Stolt residual migration result
The value used for the PS residual migration is constant for the whole section, with a value of .The value was chosen at a depth of 1900m, which is the estimated depth of the Alba reservoir, and at the center of the section.