A Study on the Dissolution Behavior of Typical Minerals in Continental Deposited Reservoirs during CO 2 Geological Storage.

CO₂ sequestration in saline aquifers is one of the most potential sequestration modes, and saline aquifers are ideal sites for CO₂ geological sequestration. After CO₂ is injected into a saline aquifer, it will have a long-term complex geochemical reaction with the formation of minerals and water, and the minerals will undergo multiple reactions such as dissolution and reprecipitation. Therefore, an in-depth study of the geochemical reaction mechanisms between CO₂ and formation minerals is of great significance to the accurate calculation and prediction of CO₂ storage volume and the safety evaluation of long-term CO₂ sequestration. In China, continental saline aquifers are widely distributed, whose mineral compositions and texture maturity are markedly different from those of the marine sedimentary basins in North America, and their stratigraphic environments are more complicated. The studies on the CO₂–water–rock (mineral) still have many research gaps or insufficiencies, and there is no report on the dissolution mechanisms of individual minerals in the reaction. Taking one certain block of Daqing Oilfield, which is a typical continental deposit in China, as an example, we analyze the dissolution laws and four types of typical continental deposited minerals under the effect of CO₂ and the change features of ionic compositions and pH of the formation water in the process of geochemical reaction. The research results indicate that CO₂ has different dissolution degrees for the four types of minerals, among which, feldspar, as the main mineral in continental sedimentary formations, has the lowest dissolution rate. Furthermore, in terms of the water type (Na+-enriched NaHCO₃) of the saline aquifer in the deep part of the continental deposit, feldspar can precipitate into the secondary minerals represented by dawsonite in the later stage, which can act as the potential minerals of carbon fixation to increase the CO₂ mineralization storage volume in continental deposited saline aquifers. [ABSTRACT FROM AUTHOR]