Numerical simulation of the dispersion of supercritical CO2 storage in saline aquifers
GAO Cheng, XU Ruina, JIANG Peixue
Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China
Abstract：Supercritical CO2 storage in saline aquifers results in a density gradient which causes dispersion and sedimentation due to CO2 dissolving in the brine during the CO2 migration. This density gradient plays a significant role in promoting the geological storage capacity, reducing pressures on the caprock, and reducing the CO2 leakage risk. This paper describes numerical investigations of the influence of key parameters such as the salinity, temperature, and pressure on the amount of CO2 dissolved in brine per unit volume over time. The results show that, for the same permeability and porous structure of the saline aquifer, a higher salinity leads to weak fingering with small amounts of dissolved CO2. Higher temperatures contribute to strong fingering and small amounts of dissolved CO2. Higher pressures also produce fingering with large amounts of dissolved CO2.
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