EVOLUÇÃO TECTONOESTRATIGRÁFICA DA FORMAÇÃO BARRA VELHA NA ÁREA DOS CAMPOS DE LAPA E SAPINHOÁ, BACIA DE SANTOS – BRASIL.

Tectonostratigraphic evolution of Barra Velha Formation in the Lapa and Sapinhoá oil fields, Santos Basin - Brazil

Abstract

The Sedimentary section of the so-called post-rift phase in the Santos basin, Brazil, consists of the Barra Velha and Ariri formations. The Barra Velha formation, composed essentially by carbonates interpreted as microbial, which is the main hydrocarbon reservoir in the pre-salt play is the research object of this work. During the westernern Gondwana Cretaceous taphrogenesis that culminated with its breakup and the generation of the South American and African continents, the Santos basin, inserted in this context underwent tectonophysical processes over three distinct phases of tectonic and stratigraphic evolution: lithospheric stretching, lithospheric thinning and mantle exhumation. The Barra Velha formation was deposited in the lithospheric thinning phase in a mixed tectonic context that combined basin generalized thermal subsidence with localized mechanical subsidence due to some rift faults remaining active throughout the post-rift phase.