CO2 sequestration is crucial to achieving net-zero CO2 emissions by 2050. For successful permanent storage entailing a century-long operational period, a combination of detailed subsurface characterization, static and dynamic reservoir modeling, economic feasibility analysis, and risk assessment is considered. The Illinois Basin Decatur Project (IBDP) and subsequent Industrial Carbon Capture and Storage (ICCS) have each successfully stored approximately one million tonnes of CO2 in the Mt. Simon Sandstone saline aquifer. Here, we re-evaluate the IBDP for CO2 sequestration potential and the possibility of further increasing the amount of CO2 stored to meet future demands. The dynamic reservoir model predicts the behavior of the CO2 plume and its containment over time. We estimate a storage capacity of 11 million tonnes of CO2 using a closed-boundary system. This was after a period of injection for 20 years and 100 years of monitoring. Economically, the project demonstrates favorable prospects, with an estimated cost of US$33 per tonne of CO2, considering carbon tax credits and existing infrastructure. The low-risk nature of the project and its potential for high-volume storage make it a promising candidate for meeting future CO2 reduction goals.

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