Abstract

The implementation of carbon capture and sequestration (CCS) is widely recognized as a crucial method for mitigating the massive amount of carbon dioxide (CO2) emissions and addressing the environmental and health threats associated with climate change. However, it is important to acknowledge that the CCS process is not without its associated geomechanical risks. These risks primarily stem from the pore pressure buildup resulting from the injection of CO2 into subsurface formations. Changing pore pressure can result in caprock failure, reactivation of existing faults, changes in poroelastic response of rock, and well integrity loss (Zhu et al. (2021)). Furthermore, CO2 injection can lead to changes in rock properties, including porosity, bulk modulus, and shear modulus. In this study, we examine the impact of CO2 injection on formation pore volume and associated elastic and geomechanical properties for its effective monitoring over geological time scales.