基于裂缝网络模型的CO<sub>2</sub>地质封存稳定性评价

李严严; 张紫薇

doi:10.3799/dqkx.2025.240

Volume 51 Issue 1

Jan. 2026

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Li Yanyan, Zhang Ziwei, 2026. Stability Assessment of CO2 Geological Storage Based on a Fracture Network Model. Earth Science, 51(1): 345-360. doi: 10.3799/dqkx.2025.240

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Li Yanyan, Zhang Ziwei, 2026. Stability Assessment of CO₂ Geological Storage Based on a Fracture Network Model. Earth Science, 51(1): 345-360. doi: 10.3799/dqkx.2025.240

Li Yanyan, Zhang Ziwei, 2026. Stability Assessment of CO2 Geological Storage Based on a Fracture Network Model. Earth Science, 51(1): 345-360. doi: 10.3799/dqkx.2025.240

Citation:

Li Yanyan, Zhang Ziwei, 2026. Stability Assessment of CO₂ Geological Storage Based on a Fracture Network Model. Earth Science, 51(1): 345-360. doi: 10.3799/dqkx.2025.240

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Stability Assessment of CO₂ Geological Storage Based on a Fracture Network Model

doi: 10.3799/dqkx.2025.240

Li Yanyan^,,
Zhang Ziwei

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

Received Date: 2025-08-08
Publish Date: 2026-01-25

Abstract

Abstract

Fractures serve as the primary storage space and seepage pathways for CO₂ geological storage, directly influencing storage efficiency and long-term containment security. This study employed UAV oblique photogrammetry to construct a discrete fracture network (DFN) model of a fractured sandstone reservoir within the Ordos Basin. Subsequently, a fluid-solid coupling numerical model for CO₂-water two-phase flow was established using the multiphysics simulation software COMSOL Multiphysics, explicitly accounting for the matrix-bedding-fracture system. Key findings reveal that CO₂ preferentially migrates along high-permeability bedding planes and fractures. Horizontal bedding, combined with low-dip, low-connectivity natural fractures, impedes vertical seepage, thereby reducing the risk of CO₂ escape into the caprock. The fracture network accelerates pressure transmission, inducing significant displacement responses. The initial rate of displacement increase was found to be 6.2 times higher than that observed in the matrix model. Consequently, accurately representing the multi-porosity system encompassing the matrix, bedding, and fractures is crucial for assessing the stability of CO₂ geological storage.
- CO₂ geological storage,
- fracture network model,
- storage potential,
- environmental science

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References(43)

References

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Stability Assessment of CO2 Geological Storage Based on a Fracture Network Model

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Stability Assessment of CO₂ Geological Storage Based on a Fracture Network Model