MULTI-METHOD THERMAL MODELLING OF THE ISCHIGUALASTO-VILLA UNION BASIN (TRIASSIC, LA RIOJA, ARGENTINA): CENOZOIC BURIAL VS HIGH MESOZOIC HEAT FLOW AS TRIGGER MECHANISMS FOR HYDROCARBON GENERATION

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

Congreso; VIII Congreso Latinoamericano de Sedimentología- XVII Reunión Argentina de Sedimentología; 2021

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