Imaging the Slope of the Marine Camamú Basin, Brazil, Using Only Reverse Time Migration

It is proposed a scheme using finite-difference Reverse Time Migration (RTM) and two or more common shot gathers which is able to perform as a velocity indicator. The procedure was tested on synthetic and real marine data and allow to define a good velocity model with errors of approximately 5%. The procedure presented here can be used on any data acquired over complex geology. A velocity field was used on RTM of near trace sections and also of stacked sections acquired over the continental break and slope of Camamú Basin (Brazil). The migrated sections were able to reveal the complex structural and stratigraphic framework for the syn-rift and pos-rift successions. This procedure has an advantage over the conventional seismic processing velocity analysis, based on normal move out equation, which is based on the assumption of flat and horizontal reflectors.