Study on the dawsonite - bearing sandstones reformed by co2 fluid

Xi-Yu Qu1, Yuan Gao1, Na Liu2, Xiu Chen1, Li Liu2

1 China University of Petroleum, Faculty of Earth Sciences & Technology, Qingdao 266580, China
2 Jilin University, College of Earth Sciences, Changchun 130061, China

Abstract


Based on the study on the reformation of Dawsonite-bearing sandstones with CO2 fluids at different temperature (100oC 200oC and 300oC) 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 200oC, with the dissolving of dawsonite-bearing sandstone, authigenic siderite is produced; at 300oC, chlorite appears on local surface of the samples. As dawsonite-bearing sandstone is moderately dissolved at 100oC and siderite is formed at 200oC, 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.

Keywords


CO2; dawsonite-bearing sandstone; hydrothermal experiment; precipitation; solution

Full Text:

 Subscribers Only