Volume 56

CO2 Storage Duration Effects on Mechanical Properties of Different Lithological Caprocks Ning Li, Wei Cheng, Xiaowen Zhang, Junfeng Shi, Jiandong Liu, Juan Jin, Zhang Zhuo, Jizhou Tang

Abstract

The caprock selection is challenging due to the potential impact of CO2-caprock reactions on the geological trap stability. In this study, various caprock environments (dolostones, sandstones, shales) with different CO2 storage durations are investigated. Laboratory experiments are conducted to evaluate the deterioration degree of mechanical properties of the damaged caprocks, including tensile and compressive strength, Young’s modulus, and Poisson’s ratio. These analyses enable to assess the caprock stability and further provide the theoretical guidance for CO2 secure storage.

Keywords CO2 storage, Caprock damage, CO2 leakage, Caprock selection, Mineralized storage