Thermal Modeling of the Ischigualasto Basin (Triassic of La Rioja, Argentina): Burial, Structuring and Magmatism Controlling the Timing of Petroleum Generation

EZPELETA M.; COLLO, G.; SANCHEZ NASSIF F.; WUNDERLIN C. ; PARRA M.

Buenos Aires

Congreso; AAPG 2019 Ice; 2019

A paleothermal analysis of the Ischigualasto extensional basin (Triassic halfgraben in La Rioja, Argentina) wascarried out in order to establish its history of subsidence and exhumation, and the relative influence of theheating processes that took place therein. This allows estimating the moment in which the potentially sourcerock intervals would have reached the hydrocarbon generation window. To determine the maximumtemperatures reached during burial, organic and inorganic indicators were used (%Ro, DRX in the clay fractionand U/Pb fission tracks in apatites). Also, thermochronology was carried out in order to elucidate thetrajectory of exhumation. The software used for thermal modeling was Petromod and Hefty. The Triassicsequences indicate a thermal gradation along the vertical direction and also from West to East, with maximumtemperatures between