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• W3005680375 abstract "Abstract When supercritical CO 2 is injected into a deep saline aquifer, the salinity of the brine can influence both the solubility of the injected CO 2 in the brine and the subsequent aqueous geochemical reactions that occur. The objective of this study is to assess the effect of brine salinity on CO 2 storage in deep saline carbonate formations. Specifically, the study aims to quantitatively assess the effect of brine salinity on (a) the amount of CO 2 that can be sequestered in the aqueous phase, (b) the storage efficiency of the repository, (c) the change in pH of the residual brine after dissolution of CO 2 , and (d) changes in the mineralogy and porosity of the rock matrix that result from mineral dissolution and precipitation reactions induced by CO 2 injection. Injection of CO 2 into a model layered carbonate formation was simulated using the reactive‐transport code TOUGHREACT 3.3. The simulations consisted of 50 years of injection into a partially completed injection well, followed by 50 years of equilibration (no injection). Salinity of the brine was varied between 1% and 15% to determine the effects of salinity. Because the solubility of CO 2 decreases as the salinity of the brine increases, an increase in brine salinity from 1% to 15% resulted in a 19% decrease in storage efficiency and a 25% decrease in the mass of CO 2 dissolved in the aqueous phase. However, despite the strong effect of brine salinity on CO 2 dissolution, there was almost no effect of salinity on the pH change in the residual brine: the chemical activity coefficient of the dissolved CO 2 increases with brine salinity, counteracting the effects of decreased solubility. Consequently, brine salinity had little effect on mineral dissolution or precipitation, or on changes in formation porosity. The study therefore helps to choose sequestration sites depending upon the salinity of the brine: lower salinity results in more solubility trapping and better storage efficiency without noticeable differences in pH drop or mineral dissolution. © 2020 Society of Chemical Industry and John Wiley & Sons, Ltd." @default.
• W3005680375 created "2020-02-24" @default.
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• W3005680375 date "2020-02-11" @default.
• W3005680375 modified "2023-09-27" @default.
• W3005680375 title "Effect of brine salinity on the geological sequestration of CO ₂ in a deep saline carbonate formation" @default.
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• W3005680375 doi "https://doi.org/10.1002/ghg.1960" @default.
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