Investigation of the Effect of Confining Pressure on the Mechanics-Permeability Behavior of Mudstone under Triaxial Compression
文献类型：期刊论文
| 作者 | Shi, Lu; Zeng, Zhijiao; Fang, Zhiming; Li, Xiaochun
|
| 刊名 | GEOFLUIDS
 |
| 出版日期 | 2019 |
| 期号 | -页码:- |
| ISSN号 | 1468-8115 |
| DOI | 10.1155/2019/1796380 |
| 英文摘要 | Injecting CO2 into a reservoir disturbs the geostress field, which leads to variations in the permeability of caprock and affects its sealing performance. In this paper, the evolution characteristics of the permeability of Yingcheng mudstone were experimentally studied during deviatoric compression under different confining pressures. As the confining pressure increased, the strength of the mudstone increased bilinearly, the angle between the fault and the maximum principle stress increased, and the fault became flatter. During compression, the permeability of mudstone first decreased and then increased and the turning point of the permeability was between the onset of dilatancy and the turning point of volumetric strain; when the fault formed, the permeability increased sharply and the fault-induced increment was reduced exponentially with increasing confining pressure. In addition, the mudstone transformed to the ductile failure mode when the effective confining pressure was greater than 35MPa, which means that the permeability did not jump within a small strain. Finally, a practical strain-based model of permeability evolution that separately considers compaction and dilatancy was proposed, and the predicted permeability values were in good agreement with the experimental results. This study revealed the effect of confining pressure on permeability evolution during compression and can help evaluate the sealing ability of mudstone caprock. |
| WOS研究方向 | Geochemistry & Geophysics ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000471991100001 |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/15075]  |
| 专题 | 岩土力学所知识全产出_期刊论文 国家重点实验室知识产出_期刊论文 |
| 作者单位 | Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Shi, Lu,Zeng, Zhijiao,Fang, Zhiming,et al. Investigation of the Effect of Confining Pressure on the Mechanics-Permeability Behavior of Mudstone under Triaxial Compression[J]. GEOFLUIDS,2019(-):-. |
| APA | Shi, Lu,Zeng, Zhijiao,Fang, Zhiming,&Li, Xiaochun.(2019).Investigation of the Effect of Confining Pressure on the Mechanics-Permeability Behavior of Mudstone under Triaxial Compression.GEOFLUIDS(-),-. |
| MLA | Shi, Lu,et al."Investigation of the Effect of Confining Pressure on the Mechanics-Permeability Behavior of Mudstone under Triaxial Compression".GEOFLUIDS .-(2019):-. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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