Matric Potential-Driven Evolution of Methane Permeability in Rough-Walled Fractures of Unsaturated Shales
文献类型：期刊论文
| 作者 | Cheng, Pengju1; Zhu, Ning2; Yu, Qingchun2; Li, Qi1
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| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2024-11-01 |
| 页码 | 18 |
| 关键词 | Shale fracture Matric potential Gas permeability Analytical model of gas flow |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-024-04238-1 |
| 英文摘要 | The gas permeability of fractures in shales provides a crucial foundation for evaluating subsurface fluid flow in numerous resource and environmental engineering projects. Water exists in natural shales, but its role in the evolution of fracture gas permeability remains incompletely understood. This study involved the preparation of two fractured shale cores, each with an individual fracture, and the use of high-precision laser scanning to reconstruct the three-dimensional morphology of rough-walled fractures. To determine how water affects gas permeability, the cores underwent saturation to five distinct matric potentials under a given confining stress and the coexistence of water and gas, and their methane permeabilities were measured at various gas pressures utilizing the steady-state flow method. The experimental findings reveal that fracture apertures follow a long-tailed normal distribution and show a scale dependence, and at the core scale, the average aperture across the fracture width exhibits a power function variation as the fracture length extends. The existence of water within fractures severely impedes gas migration, with the observed sharp reduction in the methane permeability by one to three orders of magnitude resulting from the loss in the effective aperture and available flow area due to capillary condensation as well as the swelling and dispersion of clay minerals. Gas flow through rough fractures displays a high degree of heterogeneity and noticeable slip, gas slip exponentially intensifies with increasing matric potential, and the slippage factor and intrinsic permeability exhibit a power law relationship. An analytical model considering the coupled effects of slip flow and heterogeneous fracture structures is proposed to describe gas flow in rough fractures. A comparison of the model-predicted and experimental permeabilities verified the model validity. Based on the analytical model, the matric potential-driven evolution of fracture gas permeability is quantitatively determined, which can be described as a function of exponential form. This relationship can be applied to accurately predict the variation trend of fracture permeability in underground engineering. A new experimental method is proposed to investigate the gas flow process in rough fractures under the coexistence of gas and water phases.An analytical model considering the effects of gas slippage and heterogeneous structures is derived to describe gas flow in rough fractures.The matric potential-driven evolution of fracture gas permeability is quantitatively determined. |
| 资助项目 | National Natural Science Foundation of China[41877196] ; National Natural Science Foundation of China[U1612441] ; National Natural Science Foundation of China[41272387] ; Shanxi Provincial Key Research and Development Project[202102090301009] ; Postdoctoral fellowship program of Chinese postdoctoral science foundation[GZC20241890] |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001345898800002 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/43060]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Yu, Qingchun |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.China Univ Geosci Beijing, Sch Water Resource & Environm, Beijing Key Lab Water Resources & Environm Engn, Beijing 100083, Peoples R China |
| 推荐引用方式 GB/T 7714 | Cheng, Pengju,Zhu, Ning,Yu, Qingchun,et al. Matric Potential-Driven Evolution of Methane Permeability in Rough-Walled Fractures of Unsaturated Shales[J]. ROCK MECHANICS AND ROCK ENGINEERING,2024:18. |
| APA | Cheng, Pengju,Zhu, Ning,Yu, Qingchun,&Li, Qi.(2024).Matric Potential-Driven Evolution of Methane Permeability in Rough-Walled Fractures of Unsaturated Shales.ROCK MECHANICS AND ROCK ENGINEERING,18. |
| MLA | Cheng, Pengju,et al."Matric Potential-Driven Evolution of Methane Permeability in Rough-Walled Fractures of Unsaturated Shales".ROCK MECHANICS AND ROCK ENGINEERING (2024):18. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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