Paleodrainage Mapping of the São Paulo Southern Continental Shelf on the Santos Basin

The occurrence of a paleodrainage was mapped in the continental shelf of São Paulo through previous studies by using bathymetric and sedimentological data. More recently, with the use of high resolution and low penetration seismic was possible the identification of its recent paleogeographic characteristic. With the aim to know the geometry and sismo-stratigraphic characteristics of the region, cruises mapped southward paleochannels of the inner continental shelf of São Paulo. The equipment used in data collection was the Sub Bottom Profiler 3.5 KHz. Furthermore, in the processing of seismic records was used SonarWiz 5.0, where internal reflectors were determined in sedimentary package. The data collected led to the identification of seismic stratigraphic, high concentration of paleochannels and a gas curtain in the seismic registers. The localization of the paleochannels mapped was concentrated in the central portion of the seismic lines, in front of the river outfall. These results strongly suggest a pattern of extension of current alluvial courses to the outer regions of the platform, dug in regressive periods. The data of this study should be considered preliminary for new surveys, aiming for a more precise characterization of the subject.