Integração de dados geofísicos de poços e geoquímicos na avaliação do potencial gerador dos folhelhos betuminosos da Formação Tremembé, Bacia de Taubaté

Abstract

At the Cenozoic deposits in the Taubaté Basin are found deposits of bituminous shale (oil Shale) belonging to Tremembé Formation, Oligocene, which for some years in the 50s were investigated with respect to its economic exploitation by the industrial extraction of oil contained therein. However, in the face of technological issues and conjuncture of this time, the industrial use was considered unfeasible economically. This dissertation proposed an application of geophysical Well Log for the faciology characterization of bituminous shale in Tremembé Formation, having as main objective the identification of electrofacies on electric logs, through a robust and consistent methodology. The identification of electrofacies is important to help determine the characterization of an unconventional reserves and economic viability analysis. In this study we used the conventional Well Logs: Gama Ray, resistivity, spontaneous potential and sonic. Data from well logs were integrated with the core and geochemical data, specifically data from TOC, S, IH, S2 for a realistic characterization of electrofacies. Data were obtained from three Wells in Taubaté Basin, resulting from continuous coring and wireline log along the Tremembé Formation shales. From this response is obtained as a model for each lithology, where each peak corresponds to an electrofacies, allowing the establishment of some patterns geophysical for the main facies occurring. As a result of this study, it was possible to correlate the electrofacies between wells in a section model, from sideways similarity of electrofacies between the represented marks stratigraphic , It was possible to observe the continuity of two sequences of bituminous shales with high TOC, S, IH , S2, which are considered the most important of point of economic view, and generated a 2D and 3D facies model of these layers. The present results are very promising, pointing to the possibility of applying this technique to other wells in the Basin Taubaté, providing subsidies relevant to the determination of sedimentary evolution.