Dawsonite as a Temporary but Effective Sink for Geological Carbon Storage

The possibility of using dawsonite mineral trapping as a carbon capture and storage (CCS) strategy intrigues many. In this study, we used dawsonite-rich (∼10%) CO2 gas reservoir in the Hailar basin northern China natural analogue site, along with numerical modeling, to demonstrate that large amount can be generated sandstone formations, provided sufficient Na-rich feldspar are available. While precipitated preserved only hydrodynamically-closed system long term under high fugacity log((Na+)/(H+)) activities solution, short-term (on order 10 kyr) is possible lowers pressure, which mitigates risk leakage ground surface or overlying drinking water aquifers. re-dissolution after few thousand years facilitates progressive dissipation phase over time. Consideration reservoirs saline aquifers minerals formation provide abundance dissolved sodium, significantly increases number potential CCS sites globally. Furthermore, alternating water-and-gas injection regimens could enhance precipitation Future editions Carbon Storage Atlas should consider aquifer geochemistry site selection for secure long-term addition volumetric considerations operation.