Is dawsonite a real natural analogue of CO₂ mineral trapping?-geochemical simulation, occurrences and its formation in natural environment-

Abstract

In CO₂ geological storage, the injected CO₂ in a long period is expected to be trapped as carbonate minerals and permanently fixed in underground storage system. Geochemical modeling of the storage system, however, derives different results in equilibrium modeling and reactive-transport modeling. The most significant differemce lies in the behavior and quantitative importance of dawsonite, a Na-Al hydrous carbonate. Since the reactive-transport modeling is highly dependent on kinetic parameters, more studies on natural dawsonite are necessary to elucidate the condisions and environments of its formation, thereby deriving kinetic conditions.