Marine and Petroleum Geology | VOL. 111
Mineral trapping of CO2: Hydrothermal experimental system and thermodynamic simulation on interaction between CO2–H2O–dawsonite bearing sandstone with the pH of 4–9, temperature of 80–140 °C, and increasing pCO2
Publication Date Jan 1, 2020
Abstract Dawsonite commonly occurs in CO2-enriched strata and gas reservoirs, which is the product of CO2 trapping or “ mineral fixation ”. In this study, we focused on dawsonite and conducted series of experiments with three groups of variables: temperature (80/100/120 / 140 °C), pH (4/6/7 / 9), pCO2 (0/4.3 Mpa) for comparison, aiming at understanding potential natural processes within CO2 – H2O – dawsonite bearing sandstones systems. We conducted a series of studies on the alteration characteristics of dawsonite-bearing sandstones, evolutionary mode of fluid properties, alteration of dawsonite by fluid, and the mechanism of mineral precipitation and dissolution in closed systems. Based on Scanning Electron Microprobe (SEM) observation, energy spectrum analysis, X-ray diffraction analysis, and thermodynamic numerical simulation, we evaluated the influences of temperature, pH and pCO2 on the stability of dawsonite preserved in sandstone, and further identified the favorable conditions for mineral trapping of CO2. The hydrothermal experiments suggested that: for the temperature in the range of 80 °C – 140 °C, the stability of dawsonite decreased with increasing temperature, and the fluid alteration influence on dawsonite mainly followed transformation path. When the pH is in range of 4 – 9, the stability of dawsonite decreased with the decreasing pH, and the alteration of dawsonite by fluid mainly followed decomposition path. pCO2 decided the thermal stability of dawsonite, and when pCO2 increased from 0 MPa to 4.3 MPa, the d...
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