Reverse‐time migration: Amplitude and implementation issues

Abstract

We formulate reverse‐time migration (RTM) based on the theory of true‐amplitude migration, and we give formulations for true‐amplitude RTM angle‐domain common‐image gathers. Then we address some implementation issues for RTM. Specifically, we compare RTM's efficiency using different orders of finite differencing along the time direction. Finally, we propose “harmonic‐source migration”, a phase‐encoding technique that allows increased efficiency in a delayed‐shot implementation of RTM.