Based on the study on the reformation of Dawsonite-bearing sandstones with CO2 fluids at different temperature (100 o C 200 o C and 300 o C) and different CO2/H2O/sandstone systems, it is suggested that as the temperature increases, the corrosion intensity of dawsonite-bearing sandstones is gradually increased, but the stability of the sandstone is reduced. The SEM study shows that there are radiated aggregate sediments of boehmite in all samples. At 200 o C, with the dissolving of dawsonite-bearing sandstone, authigenic siderite is produced; at 300 o C, chlorite appears on local surface of the samples. As dawsonite-bearing sandstone is moderately dissolved at 100 o C and siderite is formed at 200 o C, it indicates that even if CO2 is injected in the system for a second time, the CO2 captured in the form of carbonate minerals under the stratum condition will not be released.
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