MODELADO DE SISTEMA PETROLERO EN AMBIENTES DE FAJA PLEGADA Y CORRIDA: EJEMPLOS DEL SUBANDINO DE PERÚ Y BOLIVIA

SPACAPAN JUAN; BRISSON IGNACIO; GIAMPAOLI PABLO; ROCHA EMILIO; FUENTES FACUNDO; COMERIO MARCOS; DI BENEDETTO MATIAS

Mendoza

Congreso; 11º Congreso de Exploración y Desarrollo de Hidrocarburos; 2022

The exploration of oil and gas in fold-and-thrust belts (FTB) is considered a risky activity due to thecomplex of structural styles and the difficulty in analyzing the processes of migration, charge andpreservation of hydrocarbons during the tectonic evolution of structures in such areas. A method that contributes to improve the understanding of these factors and optimize risk assessment is the Basin and Petroleum System Modelling (BPSM). The present study shows two examples of the application of this methodology at different scales of work in areas intensely deformed by horizontal compression. The restoration of burial, deformation, exhumation and erosion coupled with accurate calculations of compaction, temperature, maturity and pressure, allow the analysis of deformation at different scales. The first example is a regional-scale model that covers the Huallaga-Marañón basin systems in Perú. Simulations indicate that the growth of the FTB affected the degree of thermal maturity of the source rock, as well as the timing of generation-expulsion and conditioned the long-distance of hydrocarbon migration to the fields in the southern Marañón. The second example explores an individual structure located in the southern Sub-Andean of Bolivia. In this case, modelling results show that the sequence of local deformation conditioned the distribution and magnitude of pore pressures and consequently the migration and charge of reservoirs located at different structural levels. Both study cases reveal that structural evolution is a critical factor in the location of potential oil and gas accumulations, affecting not only the development of petroleum system elements but also the magnitude and distribution of pore pressures that condition the movement of fluids in the subsurface. BPSM is considered as an effective tool for mitigating uncertainty and exploratory risk in areas of high structural complexity.