Effect of Temperature and Pressure on Mechanical Behavior of Reservoir Shales at Different Depths: Implications for Deep Shale Gas Extraction
文献类型：期刊论文
| 作者 | Zhao, Guokai1,2,3; Guo, Yintong2,3; Yang, Chunhe2,3; Chang, Xin2,3; Guo, Wuhao2,3; Yang, Hanzhi1 |
| 刊名 | ROCK MECHANICS AND ROCK ENGINEERING
 |
| 出版日期 | 2025-03-06 |
| 页码 | 26 |
| 关键词 | Mechanical behavior Brittleness Reservoir shale CT |
| ISSN号 | 0723-2632 |
| DOI | 10.1007/s00603-025-04470-3 |
| 英文摘要 | Understanding the mechanical and brittle-ductile behavior of shales at different depths, controlled by in-situ stresses and reservoir temperatures, is critical for borehole stability evaluation and extraction design, which determines whether deep resources can be exploited safely and efficiently. In this work, triaxial compression tests were performed on reservoir shales at varying depths of 3300-4300 m under confining pressures (pc) ranging from 20 to 110 MPa, and with temperatures (T) ranging from 25 to 160 degrees C. The brittle-ductile transition mechanism of the shale was investigated by micro-CT scanning. Finally, a new brittleness grading system was established to reflect the fracture characteristics and mechanical behavior of shales in different brittleness intervals. Results show that the mechanical properties of shales are strongly dependent on pc, whereas T (<= 130 degrees C) has a minor effect on the shale's performance except for clay-rich shales. At T = 160 degrees C, the quartz-rich shale is mechanically strengthened and the clay-rich shale is weakened by heating at high confining pressure. The reservoir shales exhibit mainly semi-brittle failure at applied pc-T conditions, indicating that the deep shale reservoirs shallower than 4500 m are suitable for fracturing stimulation. However, the clay-rich (51%) shale exhibits ductile behavior at 70 MPa-160 degrees C and 110 MPa-25 degrees C, which is not conducive to fracturing. Two-dimensional X-ray imaging shows that the cracks within the brittle damaged samples are mainly shear cracks, whereas the ductile damaged samples are dominated by a cataclastic texture covered with tiny micro-cracks, indicating that the T- and pc-induced brittle-ductile transition is associated with primarily cataclastic deformation. The above findings would be of great value for the efficient exploitation of deep shale gas resources. |
| 资助项目 | National Natural Science Foundation of China[52104010] ; National Natural Science Foundation of China[52104046] ; National Natural Science Foundation of China |
| WOS研究方向 | Engineering ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:001438281400001 |
| 出版者 | SPRINGER WIEN |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/36688]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Chang, Xin |
| 作者单位 | 1.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn Safety, Wuhan 430071, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhao, Guokai,Guo, Yintong,Yang, Chunhe,et al. Effect of Temperature and Pressure on Mechanical Behavior of Reservoir Shales at Different Depths: Implications for Deep Shale Gas Extraction[J]. ROCK MECHANICS AND ROCK ENGINEERING,2025:26. |
| APA | Zhao, Guokai,Guo, Yintong,Yang, Chunhe,Chang, Xin,Guo, Wuhao,&Yang, Hanzhi.(2025).Effect of Temperature and Pressure on Mechanical Behavior of Reservoir Shales at Different Depths: Implications for Deep Shale Gas Extraction.ROCK MECHANICS AND ROCK ENGINEERING,26. |
| MLA | Zhao, Guokai,et al."Effect of Temperature and Pressure on Mechanical Behavior of Reservoir Shales at Different Depths: Implications for Deep Shale Gas Extraction".ROCK MECHANICS AND ROCK ENGINEERING (2025):26. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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