1. Heat flow measurements and multiphysical integration studies in Campos basin, southeast Brazil
- Author
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Guimaraes, Suze, Vieira, Fábio, Fontes, Sérgio, Rocha, Nina, Lessa de Jesus, Beatriz, Meju, Maxwell, and Wahab, M Hafizan
- Abstract
A large part of the recent oil discoveries in the world is linked to the Brazilian Pre-Salt, and part of the mapped giant/supergiant reservoirs are found in the Campos basin at the Brazilian eastern continental margin. The onshore part of this basin is bordered by the Ribeira Orogenic Belt (ROB), which represents a NE–SW trending system controlled by sliding shear belts, reactivated during its evolution since the Paleoproterozoic. Crustal thermal models have been developed to examine the implications of the observed intracratonic variations on heat flow and thus build an understanding of the geodynamic parameters of basin formation. The geothermal database used in this modeling includes direct and indirect measurements, and was expanded with over 56 locations, providing a spatial extent of 0.5 x 0.5 degrees in the continental part of the basin. The thermal model took into account the variation of thermal conductivity with temperature, as well as the variation of radiogenic heat generation with depth. Results show high values for the heat flow (>70mW/m2) in the region of the Quadrilátero Ferrífero in the southern part of São Francisco Craton, surrounded by moderate heat flow pattern but increasing significantly in offshore regions where the crustal thickness is much smaller (aprox. 25km). Results of the crustal thermal model integrated with multiphysics (gravity, magnetic and seismic) datasets generate tools for imaging deep structures, especially in the distal portion of the Campos Basin, and map potential basement paleo highs and intrusive magmatic/volcanic features possibly associated to hydrocarbon and geothermal prospects., The 28th IUGG General Assembly (IUGG2023) (Berlin 2023)
- Published
- 2023