In order to explore the short-term changes in reservoir lithology and physical properties, the process of mineral corrosion, dissolution and precipitiation and the permeability variation of reservoir rocks after CO2 injection, the interation process between CO2-saturated rocks and formation water was studied in detail through core flooding laboratory experiment carried out under simulated reservoir conditions(100℃ and 24MPa). Changes in ion compositions of the reaction solution in pre- and post-CO2-flooding experiments as well as core scanning electron microscopic and whole-rock X-ray diffraction (XRD) analyses showed that dissolution and corrosion phenomena of carbonate minerals can be observed after the experiment, among which calcite dissolution is the strongest, followed by dawsonite, while ankerite the weakest. The concentration of K+ in the reaction solution varies mainly due to the dissolution of detrital K-feldspar grains. A small amount of kaolinite and intermediate products were generated after the experiment.The composition of intermediate products is mainly composed of C, O, Na, Cl, Al and Si, which have a trend to change into carbonate minerals. New minerals(Kaolinite and intermediate products) and the particles released by the dissolution of the carbonate cement were moved to pore throats and blocked the path of pore, which was the main reason that caused the core permeability reduction. The experiment results have reproduced the short-term process of corrosion of feldspar and dissolution of carbonate minerals as well as precipitation of new minerals after CO2 injection, revealed reasons of permeability variation, and provided geochemical evidence for CO2 trapping mechanisms underground.
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