Estimation of CO2 storage capacity in Qianjiang depression area in Jianghan basin, China

Storage of CO₂ in deep formations such as saline aquifers, gas and oil reservoirs, and coal beds is a viable option for reducing the amount of CO₂ released to the atmosphere. The goal of this paper is to evaluate the storage capacity in the target formation located in the central China. The CO₂ storage capacity estimated through the quick assessment is compared with the "true" values obtained using detailed numerical simulations of CO₂ and brine transport in a two-dimensional radial system. The estimated capacity values clearly demonstrated the different storage capacities in an open and closed system, with the former offering much higher storage potential. This study showed that when the seal permeability was below 10^-19 m² the system acts like a closed-system, as only a small fraction of brine escapes through the caprock and baserock.