Abstract
The Barreirinhas Basin, in the Brazilian Equatorial Margin, represents an example of a transtensional passive margin province, with high hydrocarbon potential. However, little research has been done in the past years. The geology of the basin was highly influenced by cyclic episodes of sea level fluctuations (determining the lithofacies distribution) and by gravitational tectonism, affecting the Tertiary sequence and triggering the formation of compressional features that could act as structural traps. The thermal subsidence that occurred during Turonian times, established the classical geometry of a shelf-slope-basin, and developed both, the bypass area and the accommodation space for the accumulation of up to 10 km of Late Cretaceous and the Cenozoic postrift sediments. According to gas shows from well 1-DEV-14-MAS, a working petroleum system is likely to be present in the area. This assumption is reinforced with other sources of evidence studied in this work (i.e. fluid escape structures). A basin thermal model developed in this study indicates a potential mature source rock for the Cenomanian-Turonian interval. Through a multidata integration (2D seismic, wells and geochemical data), this study aims to give a regional geological and geophysical prospectivity overview of the Barreirinhas basin.
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