Characterization and Estimation of CO2 Storage Capacity for the Most Prospective Aquifers in Sweden

Based on NORDICCS selection of the most prospective CO2 storage sites in the Nordic region, two saline aquifers in southern Sweden were subject to further investigations in an attempt to update the first static estimates of CO2 storage capacity and to improve the general understanding of the reservoir behavior. Two approaches were applied: capacity estimates for the structural and stratigraphic traps using the basin modeling software SEMI and capacity estimates using the full dynamic reservoir simulation software ECLIPSE 100, showing very different results regarding CO2 storage capacities. Hence, the SEMI modeling, depending on structural and stratigraphic traps, achieved a comparable poor CO2 storage capacity whereas the ECLIPSE simulation, countering all the main trapping mechanisms, achieved much higher estimated capacities.