Muting in SODCIGs

Choosing the right mute pattern in SODCIGs in order to obtain the estimate of the primaries and the multiples is obviously an important issue. In theory, if the migration velocity satisfies the inequality mentioned before ($V_{\mbox{mul}} < V_{\mbox{mig}} < V_{\mbox{prim}}$), the multiples would map entirely to the negative subsurface offsets while the primaries would map entirely to the positive subsurface offsets. In practice, however, some overlap is unavoidable. It is safer to allow some residual primaries in the estimate of the multiples and some residual primary in the estimate of the multiples. Appropriate tapers should be applied to avoid noises in the adjoint migration.