Abstract
Petrofacies and taphofacies defined for the Morro do Chaves Formation (Late Barremian/Early Aptian) outcropping in the Sergipe-Alagoas Basin (NE Brazil) enable the interpretation of the biostratinomic and fossil-diagenetic processes that acted on the abundant bivalve shells and enclosing sediments. Such processes played an important role in the circulation of fluids within the coquina deposits and therefore on the resulting porosity–permeability of the rocks. Ten taphofacies and four lithofacies are recognized, allowing 36 petrofacies to be defined, based on the nature of the sedimentary and taphonomic processes. Five of these petrofacies are distinguished for those showing almost total replacement of the original constituents. The relationship between petrofacies with the geometry of sedimentary bodies and their lateral and vertical variations, forms the basis of a stratigraphic model for the depositional system of the coquinas of the Morro do Chaves Formation that reflects the spatial and temporal distribution of the identified petrofacies. The integration of the evolutionary taphonomic analysis of the unit with the analysis of multiscale properties through the CAMURES Methodology allowed us to develop a theoretical model for the alteration and modification of taphonomic elements and coquinas, which reflect the rise and fall of the relative base level in a lacustrine to the restricted marine setting. This model leads to more accurate identification and classification of coquina reservoir facies, as well as the delimitation of reservoir zones for 3D geocellular modeling and flow simulation of hydrocarbon-producing reservoirs, thus improving predictive analyses.
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Acknowledgements
The authors gratefully acknowledge financial support from the PROGEOLOGIA (NUPEG–Federal University of Sergipe; Brazil) and the Geosciences Center (University of Coimbra; Portugal), namely through the CAMURES-DIAGENESE project supported by Petrobras (2017/00019-4), and through the UIDB/00073/2020 and UIDP/00073/2020 projects supported by Fundação para a Ciência e a Tecnologia. The authors are deeply grateful to Dr. Sixto Fernández López and to an anonymous reviewer for the careful revision of the manuscript, and to Dr. Maurice Tucker for helpful suggestions that improved the text.
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The research was support by the PROGEOLOGIA (NUPEG–Federal University of Sergipe; Brazil) and the Geosciences Center (University of Coimbra; Portugal), namely through the CAMURES-DIAGENESE project supported by Petrobras (2017/00019-4), and through the UIDB/00073/2020 and UIDP/00073/2020 projects supported by Fundação para a Ciência e a Tecnologia.
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10347_2020_614_MOESM1_ESM.xlsx
Supplementary file1 APPENDIX 1 Petrofacies and taphofacies defined as a result of biostratinomic processes related to different depositional environments and fossil-diagenetic processes (XLSX 24 KB)
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Garcia, G.G., Henriques, M.H., Garcia, A.J.V. et al. Petrofacies and taphofacies analyses of coquinas as a tool for the establishment of a stratigraphic evolution model of the Morro do Chaves Formation (Sergipe-Alagoas Basin, NE Brazil). Facies 67, 4 (2021). https://doi.org/10.1007/s10347-020-00614-9
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DOI: https://doi.org/10.1007/s10347-020-00614-9