Efficient Amplitude-Preserved Prestack Depth Migration

A-25 EFFICIENT AMPLITUDE-PRESERVED PRESTACK DEPTH MIGRATION Abstract 1 An efficient approximation to amplitude-preserved prestack depth migration is presented. The patented strategy can reduce the computational cost to little more than the cost of standard PreSDM. The technique splits the process into two steps: a standard PreSDM (that also keeps the prestack migrated data) followed by a second separate process that accurately recovers postmigration amplitudes and reflection angles. Important practical advantages can result from this split. An application to data from the North Sea is presented. Introduction CHRISTIAN HANITZSCH 1 2 SIDE JIN 1 3 ALI TURA 1 4 and FRANCOIS