Petrographic and seismic evidence for the depositional setting of giant turbidite reservoirs and the paleogeographic evolution of Campos Basin, offshore Brazil

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• 作者：Marcos Fetter ; Luiz F. De Ros ; Carlos H.L. Bruhn
• 关键词：Turbidite reservoirs ; Quantitative petrography ; Structural analysis ; Divergent margins ; Mantle plumes ; Intraplate tectonics ; Paleogeography ; Sequence stratigraphy
• 刊名：Marine and Petroleum Geology
• 出版年：2009
• 出版时间：June 2009
• 年：2009
• 卷：26
• 期：6
• 页码：824-853
• 全文大小：6636 K

文摘

The paleogeographic evolution of Campos Basin, a major oil province of Brazil, during the deposition of its giant turbidite reservoirs, was reinterpreted based on the integration of quantitative sandstone petrography and structural analysis of regional 3D seismic data. The major detrital compositional trends indicate that the geodynamic evolution of the continental margin, rather than global eustatic sea-level fluctuations, has exerted the main control on sand supply to the deepwater systems. This control was imposed by the interaction of three geodynamic processes: (i) escarpment retreat of the coastal mountain ridges, (ii) mantle plume-related dynamic uplift and magmatic activity, and (iii) tectonic reactivation of major basement fault-zones. The pattern of distribution of compositional and textural parameters within the turbidite sequences indicated that the sand supply to deepwater was also constrained by high-frequency stratigraphic processes of the climate Milankovitch band. This new approach to the controls on the formation of the sand-rich, deepwater systems in Campos Basin has a key importance for the generation of realistic models for the exploration of new turbidite reservoirs and for the optimized development of producing turbidite oilfields in such a world-class hydrocarbon province. The proposed integrated methodology can help to unravel the controls on the deposition of deepwater sand-rich, deepwater reservoirs in other divergent margin settings.