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AAPG Bulletin, V.
Late Paleozoic glacially related sandstone reservoirs in the Paran Basin, Brazil
1Laboratrio de Anlise de Bacias e Petrofsica, Centro Politcnico, Universidade Federal do Paran, Caixa postal 19027 CEP: 81531-990, Curitiba, PR, Brazil; [email protected]
2Laboratrio de Anlise de Bacias e Petrofsica, Universidade Federal do Paran, C.P. 19027, 81531-990, Curitiba, Brazil; present address: Geology Department, Centro Politecnico, Federal University of Paran, Jardim das Americas, Curitiba, Paran 81531-990, Brazil; [email protected]
3Petrleo Brasileiro, Cidade Universitria, Quadra 7, Ilha do Fundo, 21949-900, Rio de Janeiro, Brazil
4Laboratrio de Anlise de Bacias e Petrofsica, Universidade Federal do Paran, C.P. 19027, 81531-990, Curitiba, Brazil
Upper Paleozoic glacially related sandstones of the Itarar Group constitute thick and complex hydrocarbon reservoirs in the intracratonic Paran Basin of southern Brazil. Because these sandstones were deposited in both glacial and nonglacial environments, they show a high degree of variability in facies. In this article, we analyze outcrop and shallow well data to describe facies heterogeneities and their reservoir-quality implications. A regional subsurface sequence-stratigraphic framework was built, based on both strike- and dip-oriented well-to-well correlations. A well-exposed sandstone succession correlative with the main reservoir interval in the subsurface was selected in the eastern part of the basin. The Vila Velha sandstone comprises an up to 100-m (328-ft)-thick, unconformity-bounded, sand-rich succession composed of four stacked facies assemblages. Vertical facies succession shows a transition from glacial and glaciomarine to periglacial shallow-marine and nearshore settings, which define a retrogradational-progradational succession. Channel-mouth bars and wave-modified shoreline sandstones in the progradational section contain stratigraphically predictable reservoir-quality lithofacies. In subsurface, gas-bearing sandstone intervals with the same well-log response occur below unconformities, which control the overall reservoir geometry.
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