Abstract
Abstract The oldest petroleum discoveries on the Brazilian offshore margin are in Paleogene reservoirs of the Guaricema and Dourado fields in the structural Mosqueiro Low, the Southern Sergipe-Alagoas Basin. Study of well logs and biostratigraphic data of the Eocene Series allowed its subdivision into three stratigraphic intervals representing the Ypresian, Lutetian-Bartonian, and Priabonian stages. The Ypresian depocenter is in the Dourado Trough, whereas the Lutetian-Bartonian and Priabonian depocenters are in the Vaza-Barris Trough, controlled by halokinesis in the first one and basement deformation in the others. The Ypresian interval mainly comprises retrogradational deposits related to the Early Eocene Climate Optimum. The Middle-Eocene Basal Unconformity is the main erosive feature in the Series. The Lutetian-Bartonian and Priabonian depositional systems are progradational. Their deposition is related to basement uplift due to both intense deep-water magmatism and to the Incaica Phase of the Andean Orogeny.
Highlights
The Eocene Epoch was a particular time in the Cenozoic Era in terms of tectonics and climate changes (Rona and Richardson 1978)
A detailed zoning of the Eocene Series in the Mosqueiro Low allowed the individualization of structural features identified as plateaus, steps, and troughs
The Mosqueiro Low was compartmentalized in plateaus, steps, and troughs
Summary
The Eocene Epoch was a particular time in the Cenozoic Era in terms of tectonics and climate changes (Rona and Richardson 1978). The Sergipe-Alagoas Basin, in Northeastern Brazil, is a narrow, NE-SW elongated depositional locus, 350 km long and 35 km wide, limited to the SW by the Vaza-Barris Fault and to the NE by the Maragogi High (Lana 1990). It is divided into the Sergipe and Alagoas sub-basins by the Japoatã-Penedo High (Fig. 1). Little has been published on the area, and only Cainelli (1992) and Pedrão (2004) discussed stratigraphy, but neither provided detailed stratigraphy of the Eocene Series in the Mosqueiro Low
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