Seismic Attribute Analysis of Turbidite sandstones and Carbonate Reservoirs in Brazilian Equatorial Margin basins: Foz do Amazonas, Pará-Maranhão and Barreirinhas

Abstract

The Foz do Amazonas, Barreirinhas and Pará-Maranhão basins, located within the Brazilian Equatorial Margin, present significant hydrocarbon exploration potential. This study applies an integrated seismic attribute analysis to identify and characterize turbidite sandstones and carbonate reservoirs. Seismic attributes such as sweetness, trace envelope, and spectral decomposition were applied to 2D and 3D seismic datasets to enhance the interpretation of key geological features, including depositional systems and structural traps. The results reveal three leads in the Barreirinhas Basin and three leads in the Pará-Maranhão Basin, highlighting structural and stratigraphic traps associated with thrust fault systems and carbonate buildups. Spectral decomposition provided a detailed visualization of thin beds and depositional geometries, while sweetness attributes effectively identified hydrocarbon-bearing zones. These results contribute to a refined understanding of the petroleum systems in the Brazilian Equatorial Margin, offering a robust framework for future exploration and risk mitigation.