| Citation: |
LI Xiaoyuan, YUE Gaofan, SONG Shenghua. 2025. Numerical simulation study on the influence of primary mineral components on CO2 geological trapping forms. Geological Bulletin of China, 44(5): 921-934. doi: 10.12097/gbc.2024.11.006
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Numerical simulation study on the influence of primary mineral components on CO2 geological trapping forms
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Abstract
Objective The increasingly intensifying global climatic change necessitates carbon capture and storage (also referred to as CCS). The mechanisms and processes of CO2−water−rock interactions not only directly affect the safety and stability of CO2 reservoirs but also determine the injection efficiency and storage capacity of CO2.
Methods Based on China's first whole−process CCS demonstration project in saline aquifers and using the TOUGHREACT ECO2N software, this study constructed a water−CO2−thermal−chemical reaction coupling model for long−term CCS in reservoirs at the Shenhua CCS demonstration site.
Results Using this model, this study investigated the influence of primary mineral components in reservoirs on the transformation of different CO2 capture mechanisms. The results indicate that the deep saline aquifers in the Ordos Basin are favorable for CO2 storage capacity through the mineralization mechanism mineral trapping, with a storage capacity reaching up to 64.02% of the total injectivity at 1000 a. The calcite, orthoclase, albite, chlorite, and kaolinite in the reservoir undergo varying degrees of dissolution, resulting in the precipitation of montmorillonite, iron−bearing dolomite, and analcime. Iron dolomite is the main carbon fixing mineral, with the highest storage capacity in the water gas two−phase zone, reaching up to 15 kg/m3. The changes in the content of plagioclase, albite, and calcite have little impact on gas and dissolution trapping, and have no effect on mineralization trapping. The variation in the content of chlorite has a significant impact on the three types of trapping forms. When the initial volume fraction of chlorite increases from 1.9% to 8.4%, the mineralization trapping amount increases from 7×108 kg to 1.6×109 kg at 1000 a, with a change of 9×108 kg.
Conclusions The types and contents of primary mineral components can affect the sequestration capacity of CO2 by different trapping mechanisms. The results of this study can serve as a reference for the design optimization of existing CO2 storage projects and the proper assessment of the siting of future CO2 storage, assisting in the achievement of China's carbon neutrality target.
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References
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LI Xiaoyuan, YUE Gaofan, SONG Shenghua. 2025. Numerical simulation study on the influence of primary mineral components on CO2 geological trapping forms. Geological Bulletin of China, 44(5): 921-934. doi: 10.12097/gbc.2024.11.006
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Figure 1.
Schematic diagram of radial model
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Figure 2.
Gas saturation distribution of supercritical CO2 (Sg) at different times
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Figure 3.
Distribution of dissolved CO2(CO2(aq)) at different times
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Figure 4.
Distribution of pH values at different times
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Figure 5.
Changes in volume fraction of dissolved mineral at 1000 years
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Figure 6.
Changes in the represent dissolution, positive values represent precipitation)
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Figure 7.
Distribution of mineral sequestration at 1000 years
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Figure 8.
The influence of 4 initial mineral components on the time varying gas storage capacity
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Figure 9.
The influence of four initial mineral components on the time varying dissolution storage capacity
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Figure 10.
The influence of four initial mineral components on the time varying minerlization storage capacity
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Figure 11.
The influence of four initial mineral components on the different forms of CO2 storage at 1000 years