CO<sub>2</sub>地质封存中随机裂隙网络走向对盖层密封性影响

盛丹娜; 王惠民; 盛金昌; 郑惠峰; 黄泰仁; 吴洪涛; 黄石峰

doi:10.3799/dqkx.2023.192

Volume 50 Issue 1

Jan. 2025

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Article Navigation > Earth Science > 2025 > 50(1): 349-360

Sheng Danna, Wang Huimin, Sheng Jinchang, Zheng Huifeng, Huang Tairen, Wu Hongtao, Huang Shifeng, 2025. Effect of Random Fracture Network Orientations on Sealing Performance of Caprock in CO2 Geological Sequestration. Earth Science, 50(1): 349-360. doi: 10.3799/dqkx.2023.192

Citation:

Sheng Danna, Wang Huimin, Sheng Jinchang, Zheng Huifeng, Huang Tairen, Wu Hongtao, Huang Shifeng, 2025. Effect of Random Fracture Network Orientations on Sealing Performance of Caprock in CO₂ Geological Sequestration. Earth Science, 50(1): 349-360. doi: 10.3799/dqkx.2023.192

Citation:

Sheng Danna, Wang Huimin, Sheng Jinchang, Zheng Huifeng, Huang Tairen, Wu Hongtao, Huang Shifeng, 2025. Effect of Random Fracture Network Orientations on Sealing Performance of Caprock in CO₂ Geological Sequestration. Earth Science, 50(1): 349-360. doi: 10.3799/dqkx.2023.192

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Effect of Random Fracture Network Orientations on Sealing Performance of Caprock in CO₂ Geological Sequestration

doi: 10.3799/dqkx.2023.192

1.
College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
2.
Huadong Engineering Corporation Limited, PowerChina Huadong Engineering Corporation, Hangzhou 311122, China

Received Date: 2023-05-24
Available Online: 2025-02-10
Publish Date: 2025-01-25

Abstract

Abstract

In the process of CO₂ geological storage, in order to explore the influence of fracture network orientations on the two-phase transport of CO₂-salt water in the caprock and evaluate the sealing performance of the caprock, six fracture networks with different orientations (with angles of 0°-180°, 30°-150°, 45°-135°, 60°-120°, 90°-90° and 90°-180°, respectively) were selected for numerical simulation, so as to realize the two-phase flow study of CO₂ displacement of salt water under explicit fracture network. It is found that the fracture network orientations directly change the occurrence of water saturation, thereby affecting the difficulty of CO₂-salt water displacement. When CO₂ reaches the same penetration depth in the caprock, the displacement time decreased by 12.59 times with the fracture angle (0°-60°), but there is no obvious effect after the inclination angle increased to 60°. With the expansion of the permeability range of the fracture network, the permeability of CO₂ in the caprock increases. Among them, orthogonal fractures (90°-180°) have the largest permeability. Therefore, considering the fracture network direction is of great significance for the caprock sealing evaluation.
- CO₂ geological sequestration,
- caprock sealing,
- orientation of fracture,
- discrete fracture matrix model,
- numerical simulation

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References(43)

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Effect of Random Fracture Network Orientations on Sealing Performance of Caprock in CO2 Geological Sequestration

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Effect of Random Fracture Network Orientations on Sealing Performance of Caprock in CO₂ Geological Sequestration