Simulation of CO₂-water-rock interactions on geologic CO₂ sequestration under geological conditions of China

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• 作者：Tianye Wang ; Huaiyuan Wang ; Fengjun Zhang ; Tianfu Xu
• 关键词：Geologic CO2 sequestration ; CO2&ndash ; water&ndash ; rock interactions ; Mineral corrosion and dissolution ; New mineral formation
• 刊名：Marine Pollution Bulletin
• 出版年：15 November, 2013
• 年：2013
• 卷：76
• 期：1-2
• 页码：307-314
• 全文大小：3357 K

文摘

The main purpose of this study focused on the feasibility of geologic CO₂ sequestration within the actual geological conditions of the first Carbon Capture and Storage (CCS) project in China. This study investigated CO₂-water-rock interactions under simulated hydrothermal conditions via physicochemical analyses and scanning electron microscopy (SEM). Mass loss measurement and SEM showed that corrosion of feldspars, silica, and clay minerals increased with increasing temperature. Corrosion of sandstone samples in the CO₂-containing fluid showed a positive correlation with temperature. During reaction at 70 掳C, 85 掳C, and 100 掳C, gibbsite (an intermediate mineral product) formed on the sample surface. This demonstrated mineral capture of CO₂ and supported the feasibility of geologic CO₂ sequestration. Chemical analyses suggested a dissolution-reprecipitation mechanism underlying the CO₂-water-rock interactions. The results of this study suggested that mineral dissolution, new mineral precipitation, and carbonic acid formation-dissociation are closely interrelated in CO₂-water-rock interactions.