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In the Permian petroleum system of the Paraná Basin, organic-rich source rocks (Assistência Member of the Irati Formation) were thermally matured by the heat of Cretaceous basic igneous intrusions (diabase sills) of varying thicknesses (few centimeters up to 240 m). This constitutes an atypical petroleum system, characterized by the synchronism of generation and migration processes with the magmatism (138–127 Ma). During this period, countless generation and migration pulses occurred from multiple generation kitchens that were not related to the basin depocenter, in sharp contrast to basins in which thermal maturation is controlled by increasing burial.

The total volume of hydrocarbons generated by the thermal effect of the magmatism (petroliferous charge) was calculated, mapped, and interrelated with other processes (trapping, migration, and accumulation) and essential elements (reservoirs and seal) to unravel the temporal and spatial relationships of this atypical Permian petroleum system.

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