How much CO2 is trapped in carbonate minerals of a natural CO2 occurrence?

When CO2 is injected into a subsurface reservoir, it undergoes structural-stratigraphic, residual, dissolution and mineral trapping mechanisms. Among these, the most permanent and preferable is the mineral trapping, in which carbonate minerals build the CO2 into their structures. In this study the amount of CO2 trapped in minerals was estimated from both analytical data of and thermodynamic geochemical models for a natural CO2 occurrence. Models underestimate the amount of trapped CO2 to be 0.004 tons/m3 reservoir in comparison with measured amount of dawsonite and other carbonates in rock samples indicating that 0.02-0.18 tons CO2 is trapped in one m3 reservoir.