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| Characterization method of rock fracture permeability in fault fracture zone |
| SUN Wenbin1,2, CAO Zhenbo1, DONG Faxu1
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（1. School of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China;
2. State Key Laboratory of Coal Mining and Clean Utilization, Beijing 100013, China） |
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Abstract The distribution law of fluid flow in natural fissures was obtained by simulating the fluid flow in the rock fissures of the fault fracture zone. Based on the theoretical analysis, the velocity distribution model of wedge-shaped flow field was established. It was found that the location of the fracture mainstream zone could be expressed by the maximum inscribed circle of the fracture section. Computed tomography(CT)was used to reconstruct the natural fracture of the dielectric skeleton of the fault, and the maximum inscribed circle of the fracture was calculated by MATLAB to estimate the permeability of the fracture. The correlation between the results to calculate the fracture permeability obtained by the maximum inscribed circle method and the hydraulic diameter method was 0.976, which indicated that it was feasible to calculate the fracture permeability by the maximum inscribed circle of the fracture section instead of the hydraulic diameter.
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Received: 21 November 2022
Published: 20 March 2023
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