Geomorfologia sísmica aplicada ao estudo de depósitos de fluxos gravitacionais na porção Sul da Bacia do Recôncavo, Bahia

Abstract

This work aims to apply seismic geomorphology techniques for gravity-driven deposits identification in the southern portion of the Recôncavo Basin. Two seismic volumes, BT-REC and Cantagalo, and data from 31 wells were used. Four Rift Development Surfaces (RD-1 to RD-4) and one Basal Discordance (BD) were mapped on the seismic and well data, resulting in four rifting phases in the basin formation process (rift 1 to rift 4). The marking of debrites and turbidites in well data allowed the elaboration of thickness maps, showing a change in the deposition of these gravity flows from southeast to southwest from the beginning of rift 2 to the end of rift 3. In the last stage of the work, the seismic attributes RMS amplitude and similarity were applied to generate seismic geomorphology maps. With the integration with well data and seismic lines it was possible to identify four depositional elements: filled turbidite channels, turbidite lobes, debrites deposits and deltaic fronts. The use of this technique proved to be very interesting to understand the distribution of possible hydrocarbon reservoirs and their geometry in the filling of a rift type basin.