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Modern industrial production emits vast quantities of CO2, and to mitigate the greenhouse effect caused by CO2, geological sequestration of CO2 is imperative. Consequently, the utilization of salt caverns for CO2 capture and storage is being considered.
This study uses the salt rock formation in Daning County, Shanxi Province as a potential reservoir. Based on geological survey data, a geological model is established for the Daning County salt rock CO2 storage pilot area. Under fluid-solid coupling conditions, CO2 leakage extent is represented by CO2 pore pressure as a sealing indicator, while vertical displacement at the top of the salt cavern reservoir and vertical stress serve as stability indicators. Long-term sealing integrity and stability studies are conducted for the salt cavern reservoir under varying CO2 storage pressures and different pillar spacing conditions.
As the gas storage pressure increases, the leakage range of the gas expands, the vertical displacement of the reservoir rock increases, and the range of the plastic zone in the rock decreases. At the final state with storage pressures of 17, 23, 27 and 33 MPa, the leakage ranges of the gas are 47, 67, 73 and 84 m, the vertical displacement at the top of the cavity is –11.5, 12.9, 28.7 and 52.2 mm, and the range of the rock mass plastic zone is 22, 11.8, 8 and 4 m, respectively. As the spacing between mine pillars increases, the vertical displacement and vertical stress of the surrounding rock decrease. The spacing has little effect on the gas leakage range and plastic zone. When the spacing between mine pillars is 1.0, 1.5, 2.0 and 3.0 times the original spacing, the gas leakage range remains between 60 m and 63 m, and the vertical displacement at the cavity top is 31.7, 29.1, 28.2 and 27.3 mm, respectively. The plastic zone extent within the gas storage reservoir is broadly consistent, ranging between 9 m and 10 m, respectively.
Excessively high pressure in a storage reservoir compromises its sealing integrity, while excessively low pressure undermines its stability. A greater spacing between pillars within the reservoir enhances both sealing integrity and stability, but the impact is relatively minor. This study provides a theoretical foundation for CO2 storage in the Daning Salt Cavern in Shanxi Province.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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