A Comprehensive CO2 Sequestration Study in Aquifer Formation: Impact on Total CO2 Stored Through Uncertainty Analysis and Coupled Model with Injection Network

Abstract

This final project research focuses on CO2 sequestration in aquifer formations. CO2 sequestration is one of the methods that can be applied to reduce the amount of greenhouse gas emissions by storing it in the reservoir layer with a specified depth. The purpose of this study is to determine the potential for leakage in caprock through plume migration by considering structural, residual, and solubility trapping; to find out the total CO2 injection before and after the couple with the injection network; and to determine the effects of permeability, SWCR, SGCR, and salinity on total injection through uncertainty analysis. This research method uses a numerical simulation approach using reservoir simulation with tNavigator software. The dynamic model was carried out in pairs with geomechanic parameters to see the potential deformation of rocks. This study used the DoE to create 22 cases from the spread of the resulting variant. With an injection of 5 MMSCF/d, it shows that the reservoir can store as much as 120 Bscf and 180 Bscf if it is done in a couple with an injection network without leakage in the caprock. The results of the DoE show that the most influential parameter on total CO2 injection is salinity. Salinity affects the solubility of CO2 trapping, the higher the salinity level of an aquifer the harder it is for CO2 to dissolve in water. In the MULTPERMZ variable is the effect of permeability on total injection, the greater the kv/kh value, the more dominant the vertical movement of CO2 will be so that it produces less total injection. The SWCR and SGCR values affect the residual CO2 value in the reservoir, the greater the SWCR value, the smaller the gas mobility, which means that the SGCR value will be smaller (the total CO2 injection will decrease in the residual trapping contribution).