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标题：Effects of Aqueous Solubility and Geochemistry on CO2 Injection for Shale Gas Reservoirs
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作者：Ji Ho Lee ; Jinhyung Cho ; Kun Sang Lee 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
页码：1-14
DOI：10.1038/s41598-020-59131-y
出版社：Springer Nature
摘要：In shale gas reservoirs, CH 4 and CO 2 have finite aqueous solubilities at high-pressure conditions and their dissolutions in water affect the determination of the original gas in place and the CO 2 sequestration. In addition, the dissolution of CO 2 decreases the pH of connate water, and the geochemical reactions may thus occur in carbonate-rich shale reservoirs. The comprehensive simulations of this work quantify the effects of aqueous solubility and geochemistry on the performance CO 2 huff-n-puff process in shale gas reservoir. Accounting for the aqueous solubility of CH 4 increases the initial natural gas storage and natural gas production. The effect of the aqueous solubility of CO 2 enables to sequester additional CO 2 via solubility trapping. Considering the geochemical reactions, the application of the CO 2 huff-n-puff process causes the dissolution of carbonate minerals and increases the porosity enhancing the gas flow and the gas recovery. Incorporation of geochemistry also predicts the less CO 2 sequestration capacity. Therefore, this study recommends the consideration of aqueous solubility and geochemical reactions for the accurate prediction of gas recovery and CO 2 sequestration in shale gas reservoirs during the CO 2 huff-n-puff process.