Abstract
The Sergipe–Alagoas Basin, in northeastern Brazil, has extensive exposures of carbonate rocks that may be studied as analogues to hydrocarbon reservoirs. The outcrops are equivalent to the pre-salt and post-salt reservoirs of the Campos and Santos basins, the most important hydrocarbon exploration targets nowadays in Brazil. Outcrops and well logs of the Riachuelo Formation, the most important for analogue studies of Cretaceous marine carbonate reservoirs of the Campos Basin due to the great variability of facies, are described and interpreted to identify the depositional cycles and stratigraphic sequences. Three unconformities formed during the initial drift phase of the basin are recognized. The depositional setting of the studied section changes from a siliciclastic-dominated continental to shallow-marine mixed siliciclastic-carbonate at the base to a shallow-marine carbonate platform in the upper part. The transgressive–regressive (T–R) sequence model was used for the stratigraphic analysis, leading to a stratigraphic framework of three third-order T–R sequences, with an estimated duration of approximately 2.0, 4.5 and 1.5 Ma, respectively. Consequently, the higher frequency cycles identified in the well logs represent a timing of circa 140,000 years, and are interpreted as fourth-order depositional cycles.
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Acknowledgements
The authors acknowledge Petrobras S.A. for financial support and ANP (Agência Nacional de Petróleo) for providing the data, and thanks the colleagues of GETA/UFBA and UFMG for the discussions during the elaboration of this paper. M.V.S.D. thanks specially the colleagues from Progeologia Laboratory/UFS for the long years of work in R&D projects in the Sergipe–Alagoas basin, and also thanks in a same special way the senior geologist Paulo Tibana for all the teachings about carbonate rocks. M.H. acknowledges CNPq (Brazilian Council for Research) for personal study Grant (304657/15-8). We would like to acknowledge the reviewers of the manuscript, whose revision resulted in a huge improvement of the manuscript.
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Dantas, M.V.S., Holz, M. High-resolution sequence stratigraphy of a cretaceous mixed siliciclastic-carbonate platform succession of the Sergipe–Alagoas Basin, NE Brazil. Facies 66, 4 (2020). https://doi.org/10.1007/s10347-019-0588-x
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DOI: https://doi.org/10.1007/s10347-019-0588-x