Estruturação tectônica da porção sul da Bacia de Cumuruxatiba e sua influência nos sistemas petrolíferos

The Cumuruxatiba Basin is located at the Southeast of the Bahia State. The total area of the Basin is calculated in around 20.500 km ². The geological context suggested that the basin is located on the contact between two differents geotectonic provinces: the San Francisco Craton and the Orogenic belt of Araçuaí. Although important reserves haven't been proven until today, the Basin shows some geologic characteristics that can transform it in an important producer hydrocarbon region. This basin has two recognized petroleum systems: Cricaré-Cricaré(!), that show subcomercial oil accumulation; and Regency-Urucutuca(!), that show comercial oil accumulation (Arraia Field). The geologic evolution of the Cumuruxatiba Basin, as well as other basins of the eastern Brazilian coast, it was controlled for tectonics events associates with the drifting of continents, this evolution include the opening of the Atlantic Ocean. In this context, lacustrine sediments of the phase rift are covered by evaporitics rocks of the Aptian and by the rocks of the passive margin. The expressive occurrence of basaltic-volcanic rocks (From Upper Cretaceous to Paleogene-Neogene) are distinguished by the constitution of highs volcanics of Royal Charlotte and Abrolhos.