Simulação da estocagem de Co2 em reservatórios de petróleo usando rochas digitais

Abstract

Global warming demands urgent mitigation strategies, with Carbon Capture and Storage (CCS) being a prominent one. This work aimed to investigate the behavior of carbon dioxide (CO2) in depleted oil reservoirs, utilizing computational simulation in the GeoDict software on two digital sandstone rocks. Initially, the methodology was validated with literature data, demonstrating the method's reliability in predicting petrophysical properties such as porosity and absolute permeability. The comparative analysis involved the simulation of drainage and imbibition processes, in addition to relative permeability. The characterization results revealed that sample 1 has greater porosity (22.5%) and higher absolute permeability (1.59 D) compared to sample 2 (14.4% and 0.177 D, respectively). In terms of storage security, sample 2 exhibited a significantly higher capillary entry pressure, indicating greater resistance to gas migration. The analysis of the capillary pressure curves during the drainage and imbibition processes confirmed the occurrence of hysteresis. sample 1, which has a maximum saturation 48.5% greater than sample 2, presents a higher residual trapping potential, making it more effective in long-term CO2 immobilization, while sample 2 offers greater structural containment and resistance to flow. It is concluded that simulation on digital rocks is a promising tool for optimization and security in CCS projects.