Application of conceptual reactive transport modeling to geologic CO₂ sequestration

다국어 초록 (Multilingual Abstract)

In order to evaluate the capacity and efficiency of a bedrock aquifer as the site of geologic CO₂ sequestration, the authors conducted a conceptual reactive transport modeling. In our simulation model, supercritical CO₂ was injected with water at a high pressure (100 bars) into an aquifer having the volumetric size of 5 km × 5 km × 1 km (depth) under 35℃ for 50 years. It was assumed that mineralogy of the aquifer consists of quartz, plagioclase, K-feldspar, biotite, calcite, and kaolinite. The modeling results show that dissolution of plagioclase and biotite and the successive precipitation of carbonate minerals such as siderite, calcite, and dawsonite are important for CO₂ sequestration. 70.9% of the injected CO₂ (equally, 31 kg CO₂/㎥) is precipitated as carbonate minerals, while 29.1% of CO₂ is remained dissolved in groundwater. The sensitivity analysis under variable contents of plagioclase and biotite in aquifer suggests that the efficiency of mineral trapping is very sensitive to the biotite content. The results of this study indicate that geologic CO₂ sequestration in deep aquifer dominantly occurs by the mineral trapping due to carbonate precipitation, and show that most of the injected CO₂ can be safely sequestered as solid phases in the aquifer for a long time. Even though our modeling was performed under highly simplified conditions, this study shows that reactive transport modeling should be used to evaluate the potential of a deep aquifer to sequester CO₂ with regard to the water-rock interaction and geochemical behavior of CO₂.

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