CRS-based Seismic Imaging in Complex Marine Geology

The present work represents an extension of the efforts described previously by the authors, now to marine data, and we demonstrate that Common Reflection Surface (CRS) stack and imaging gives results that clearly improves: (1) the signal-to-noise ratio; (2) the continuity of reflection events; (3) enhances the surface multiple; and (4) that the CRS operator approximates a pseudo-migration. The workflow is summarized as: (1) Preprocessing; (2) CRS stack; (3) Residual static correction; (4) Prestack data enhancement; (5) CRS stack; (6) Pseudo-migration. The CRS stack has been described by several authors, and the tecnology supports subsequent processing based on the wavefront attributes. The preprocessing steps were performed with the free seismic processing package CWP/SU. Marine geological structural features of the survey area are described for sedimentary basins of the passive continental shelf of the Brazilian South Atlantic.