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.; SÁNCHEZ NASSIF, FRANCISCO; WUNDERLIN, C.A; PARRA, MAURICIO

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

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 the heatingprocesses that took place therein. This allows estimating the moment in which the potentially source rock intervalswould have reached the hydrocarbon generation window. To determine the maximum temperatures reachedduring burial, organic and inorganic indicators were used (%Ro, DRX in the clay fraction and U/Pb fission tracksin apatites). Also, thermochronology was carried out in order to elucidate the trajectory of exhumation. Thesoftwares used for thermal modelling were Petromod and Hefty. The Triassic sequences indicate a thermalgradation along the vertical direction and also from West to East, with maximum temperatures between