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Brazilian Journal of Geology

versão impressa ISSN 2317-4889

Resumo

MATEUS, António; RICCOMINI, Claudio; FERREIRA, Ezequiel J. E. C. B.  e  TASSINARI, Colombo C. G.. Permian-Triassic maturation and multistage migration of hydrocarbons in the Assistência Formation (Irati Subgroup), Paraná Basin, Brazil: implications for the exploration model. Braz. J. Geol. [online]. 2014, vol.44, n.3, pp.355-360. ISSN 2317-4889.  https://doi.org/10.5327/Z2317-4889201400030002.

New lines of geological evidence strongly suggest that the main period of hydrocarbon maturation within Assistência Formation should be Permian-Triassic, stimulated by a high geothermal gradient that also sustained various manifestations of hydrothermal activity. Three main stages of fluid/hydrocarbon migration can also be inferred on the basis of multiscale observations: confined flow in late Permian to Triassic times, depending on the local build-up of fluid pressures; heterogeneous flow in Lower Cretaceous, triggered by a rejuvenated temperature gradient assisted by the early developed permeability conditions; and a late flow possibly driven by local pressure gradients, after complete cooling of dolerite dykes/sills. The early maturation and multistage migration of hydrocarbons have significant consequences in the design of exploration models to be applied in Paraná Basin.

Palavras-chave : Hydrocarbon; Maturation; Generation; Assistência Formation; Permian-Triassic; Paraná Basin; Brazil.

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