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Investigation of the effect of initial structure and loading condition on the deformation, strength, and failure characteristics of continental shale

文献类型：期刊论文

作者Duan, Yongting1,2; Feng, Xia-Ting1,2; Li, Xiao3; Ranjith, Pathegama Gamage4; Yang, Baicun5; Gu, Liangjie1,2; Li, Yu5
刊名GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES
出版日期2022-12-01
卷号8期号:6页码:16
ISSN号2363-8419
关键词Unconventional oil Lamellar continental shale Horizontal stress difference Computed tomography (CT) Stress-structure-controlled failure mode
DOI10.1007/s40948-022-00521-z
英文摘要The study of the mechanical characteristics of lamellar continental shale is of great theoretical and application value for unconventional shale oil production. In this study, four cuboid continental shale specimens were subjected to true triaxial compression tests to investigate their deformation, strength, and failure characteristics. The initial structures were analysed at three observational scales using optical photography, three-dimensional microscopic and thin section observations. Specimens were tested under different intermediate stresses and the force-displacement data in three directions were monitored. The failure characteristics were studied using optical photography and non-destructive X-ray computed tomography (CT). It was found that the continental shale specimens had high heterogeneity and were composed of a large number of natural fractures and lamina with uneven thicknesses, and the macroscopic mineral bands were of two main types: those mixed with clay minerals and those mixed with quartz, feldspar and mica minerals. Under four applied stress conditions, the shale deformation stiffness increases with the increasing horizontal stress difference, and the peak strength of continental shale conforms to the Mogi-Coulomb criterion. The failure mode of continental shale interacts with natural horizontal fractures and new inclined/vertical fractures which develop along the direction of intermediate principal stress. With increasing horizontal stress differences, the inclined shear cracks are flatter, the horizontal crack and the connection between horizontal cracks with oblique/vertical cracks are more obvious. The initial structural characteristics and the stress conditions jointly affect the stress-strain curve response with stress fluctuation points and crack characteristics in "bricklaying" form, producing a stress-structure-controlled failure mode. These conclusions have value for engineering applications and provide theoretical guidance for the design of continental shale oil recovery schemes.
WOS关键词ORDOS BASIN ; HARD-ROCK ; OIL ; FRACTURE ; SANDSTONE ; STRESS ; CHINA
资助项目National Natural Science Foundation of China[42102309] ; National Natural Science Foundation of China[42007243] ; National Natural Science Foundation of China[41227901] ; Fundamental Research Funds for the Central Universities[N2101032] ; China Postdoctoral Science Foundation[2021M690562]
WOS研究方向Energy & Fuels ; Engineering ; Geology
语种英语
出版者SPRINGER HEIDELBERG
WOS记录号WOS:000886994800001
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Fundamental Research Funds for the Central Universities ; Fundamental Research Funds for the Central Universities ; China Postdoctoral Science Foundation ; China Postdoctoral Science Foundation
源URL[http://ir.iggcas.ac.cn/handle/132A11/107676]  
专题地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者Duan, Yongting; Feng, Xia-Ting
作者单位1.Northeastern Univ, Sch Resources & Civil Engn, Minist Educ Safe Min Deep Met Mines, Key Lab, Shenyang 110819, Peoples R China
2.Northeastern Univ, Key Lab Liaoning Prov Deep Engn & Intelligent Tec, Shenyang 110819, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
4.Monash Univ, Deep Earth Energy Lab, Bldg 60, Melbourne, Vic 3800, Australia
5.Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China
推荐引用方式
GB/T 7714		 Duan, Yongting,Feng, Xia-Ting,Li, Xiao,et al. Investigation of the effect of initial structure and loading condition on the deformation, strength, and failure characteristics of continental shale[J]. GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,2022,8(6):16.
APA Duan, Yongting.,Feng, Xia-Ting.,Li, Xiao.,Ranjith, Pathegama Gamage.,Yang, Baicun.,...&Li, Yu.(2022).Investigation of the effect of initial structure and loading condition on the deformation, strength, and failure characteristics of continental shale.GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES,8(6),16.
MLA Duan, Yongting,et al."Investigation of the effect of initial structure and loading condition on the deformation, strength, and failure characteristics of continental shale".GEOMECHANICS AND GEOPHYSICS FOR GEO-ENERGY AND GEO-RESOURCES 8.6(2022):16.

入库方式： OAI收割

来源：地质与地球物理研究所

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