Anisotropic mechanical behavior of ultra-deep shale under high in-situ stress, a case study in the Luzhou block of the southern Sichuan Basin, China
文献类型：期刊论文
| 作者 | Zhao, Guokai1; Guo, Yintong2; Yang, Chunhe1,2; Wang, Lei2; Guo, Wuhao2; Yang, Hanzhi1; Wu, Xiaolong1; Liu, Hejuan2 |
| 刊名 | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
 |
| 出版日期 | 2023-10-01 |
| 卷号 | 170页码:15 |
| 关键词 | Ultra-deep formation Shale Mechanical behavior Brittleness Anisotropy Energy |
| ISSN号 | 1365-1609 |
| DOI | 10.1016/j.ijrmms.2023.105536 |
| 英文摘要 | The safe and efficient development of ultra-deep shale gas deeper than 4500 m is closely related to the comprehensive evaluation of the mechanical behavior, brittleness and anisotropy characteristics of reservoir rocks under in-situ stress conditions. However, the above-mentioned information about ultra-deep shale is rarely reported. This study aims to fill this gap by systematically investigating the mechanical and anisotropic char-acteristics of cores, with 0 degrees and 90 degrees bedding orientations, from different layers in the vertical depth of 4900-4930 m, under confining pressure of 110 MPa. Furthermore, a new brittleness index with three parts related to brittle failure, i.e., the energy storage performance in the pre-peak stage, the performance of elastic energy used to maintain the post-peak failure, and the severity of the energy released during the post-peak stage, all of which are physically meaningful, was proposed. Subsequently, the index was validated and applied to the brittleness evaluation of ultra-deep reservoir rocks. The brittleness was evaluated in the following descending order: black shale of Longmaxi Formation > gray-black shale of Wufeng Formation > limestone of Baota Formation. Overall, the Wufeng-Longmaxi Formation shale still exhibits brittle failure under such high confining pressure, while the Baota Formation limestone exhibits quasi-ductile failure, which is consistent with the phenomenological behavior of cores. Further, various experimental techniques have been employed to study the brittle and quasi-ductile failure mechanisms of reservoir rocks. The anisotropy evaluation results show that the anisotropy degree of the mechanical and brittleness parameters corresponding to the deep formation is signifi-cantly lower than that of the shallow formation. The anisotropy degree of strength and deformation parameters (Young's modulus, Poisson's ratio) is closely related to the content of quartz and clay minerals, respectively. The above results are expected to provide data support and theoretical guidance for the development of deep and ultra-deep shale gas in the southern Sichuan region of China. |
| 资助项目 | National Natural Science Foundation of China[52104010] ; National Natural Science Foundation of China[52104046] ; CAS Pioneer Hundred Tal-ents Program[2017-124] |
| WOS研究方向 | Engineering ; Mining & Mineral Processing |
| 语种 | 英语 |
| WOS记录号 | WOS:001048882400001 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/39196]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Guo, Yintong |
| 作者单位 | 1.Chongqing Univ, State Key Lab Coal Mine Disaster Dynam & Control, Chongqing 400044, Peoples R China 2.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 | Zhao, Guokai,Guo, Yintong,Yang, Chunhe,et al. Anisotropic mechanical behavior of ultra-deep shale under high in-situ stress, a case study in the Luzhou block of the southern Sichuan Basin, China[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2023,170:15. |
| APA | Zhao, Guokai.,Guo, Yintong.,Yang, Chunhe.,Wang, Lei.,Guo, Wuhao.,...&Liu, Hejuan.(2023).Anisotropic mechanical behavior of ultra-deep shale under high in-situ stress, a case study in the Luzhou block of the southern Sichuan Basin, China.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,170,15. |
| MLA | Zhao, Guokai,et al."Anisotropic mechanical behavior of ultra-deep shale under high in-situ stress, a case study in the Luzhou block of the southern Sichuan Basin, China".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 170(2023):15. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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