Numerical Simulation of Partitioning and Storage of Impure CO 2 in a Saline Aquifer at the Shenhua CCS Site, China

作者：Li Liu, Li Liu, Guangrong Jin, Haiyun Ma, Sanshan Cheng, Lihua Liu, Lihua Liu · 发表于：Energy & Fuels · 年份：2024 · DOI：10.1021/acs.energyfuels.3c05042 · 被引用次数：10 · 研究领域：CO2 Sequestration and Geologic Interactions、Groundwater flow and contamination studies、Enhanced Oil Recovery Techniques

Carbon capture and storage (CCS) is a key technology to control emissions of CO 2 and mitigate climate change. Coinjection of CO 2 with major impurity (i.e., N 2 or O 2 ) into saline aquifers would be an economical strategy. To assess the feasibility of coinjection, the partitioning and storage efficiency of impure CO 2 in a deep saline aquifer were numerically investigated using a two-dimensional (2-D) radial anisotropic model, the aquifer condition referred to that of the Shenhua CCS site in the Ordos Basin. The results indicated that a high concentration of impurity moderately accelerated CO 2 migration, and the formation dip angle dramatically promoted the migration as well as high temperature. Meanwhile, the partitioning of CO 2 with impurities became intensive with the increase of impurity concentration. N 2 could be a suitable tracer to monitor leakage in saline aquifers, since the hysteresis of the breakthrough time between CO 2 and N 2 was more evident. Moreover, N 2 lowered the storage efficiency of gaseous CO 2, and the lowering was more obvious with the rising formation dip angle and temperature. The impact of N 2 on the storage efficiency of gaseous CO 2 was obvious compared to O 2 under the same concentration. The investigation could be crucial for assessing the feasibility of coinjection and the long-term performance of the saline aquifer storage system.