Provenance of deep-water reservoir sandstones from the Jubarte oil field,Campos Basin,Eastern Brazilian Margin |
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Authors: | Paola De Rossi Fontanelli Luiz Fernando De Ros Marcus Vinicius Dorneles Remus |
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Institution: | 1. Petrobras, UN-ES/EXP/ABIG, Av. Fernando Ferrari, 1000, Mata da Praia, Vitória, Espírito Santo, Caixa Postal 019010, CEP 29075-973, Brazil;2. Universidade Federal do Rio Grande do Sul, Instituto de Geociências, prédio 43126, sala 110, Av. Bento Gonçalves, 9500, Porto Alegre, RS, Caixa Postal 15001, CEP 91509-900, Brazil |
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Abstract: | The provenance of the Maastrichtian deep-water reservoir sandstones from the Jubarte oil field (Campos Basin, eastern Brazil), was studied using an integrated approach that included quantitative petrography, conventional heavy mineral analysis, garnet mineral chemistry and zircon geochronology. The reservoirs are predominantly coarse, poorly-sorted sandstones with feldspathic composition derived from uplifted basement terrains. The fourth- and fifth-order depositional sequences analyzed show no major variations in composition or in provenance through time. However, variations in apatite:tourmaline presents potential to be used as a parameter for sandstone correlation within the field. The composition of heavy minerals indicates derivation from high temperature and low-to-medium pressure aluminous metapelitic rocks, from granites and subordinate mafic rocks, derived from the Cabo Frio Tectonic Domain and the Oriental terrain of Ribeira orogen, characterizing a supply route from SW to NE. The low ZTR index, as well as the absence of low-grade stable heavy minerals and of metasedimentary rock fragments, suggest that by the end of Cretaceous all supracrustal, low-grade terrains had already been totally eroded, and that plutonic, infracrustal rocks were exposed, similarly to the present situation. |
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Keywords: | Provenance Reservoir Turbidite Deep-water sandstone Upper Cretaceous Jubarte Field Campos Basin |
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