Metodologia integrada de exploração de petróleo utilizando gravimetria e interpretação sísmica para a identificação de reservatórios fraturados: estudo de caso na Bacia de Sergipe-Alagoas

Abstract

The exploration and production of oil resources in other types of reservoirs represents a new opportunity to complement the increasing demand for energy sources in Brazil. Usually, the exploratory success of this type of deposit depends on the determination of a series of factors, among them: the location of the sweet-spots (areas with the highest concentration of hydrocarbons in the source rocks), the identification of geological formations with a high content of organic carbon total (TOC) and thermal maturity for hydrocarbon generation, as well as determination of the natural system configuration of faults and fractures. Geophysical methods for the characterization of unconventional reservoirs, in particular, seismic interpretation and petrophysical well data integrated, are fundamental tools to get the external geometry of the accumulations and the definition of structural, stratigraphic and facies heterogeneities. This thesis presents a new methodology for the exploration and characterization of unconventional reservoirs, from the regional scale, using the gravimetric method for the a priori definition of the areas more favorable to fracturing, up to a detail scale of greater through the seismic attributes interpretation for determination of structural and stratigraphic features, followed by seismic inversion with petrophysical analysis to better understand the characteristics of the reservoirs, especially the definition of reservoir and no reservoirs facies