X-ray micro-tomography for investigation of meso-structural changes and crack evolution in Longmaxi formation shale during compressive deformation

doi:10.1016/j.petrol.2018.01.079

	X-ray micro-tomography for investigation of meso-structural changes and crack evolution in Longmaxi formation shale during compressive deformation
	Wang, Y.1; Li, C. H.1; Hao, J.2; Zhou, R. Q.2
刊名	JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
	2018-05-01
卷号	164 页码:278-288
关键词	Shale fracturing Micro-tomography CT X-ray imaging Fracture evolution Longmaxi shale
ISSN号	0920-4105
DOI	10.1016/j.petrol.2018.01.079
文献子类	Article
英文摘要	Shale is a typical heterogeneous geomaterial and investigation of the meso-structural changes and crack evolution is beneficial to shale gas development. Understanding the microscopic failure mechanism is undoubtedly crucial to hydraulic fracturing treatment. In this paper, real-time high-resolution X-ray Computed (micro-) Tomography (X-ray CT) with was used for the first time to deform shale sample experimentally under unconfined axial compression. Organic matter, pyrite, and micro-fractures were volumetrically rendered with a resolution of 11.27 mu m, and 2D/3D image investigations enabled us to explore the structure and fracture evolution of the sample due to in-situ compression. This work reveals that the stress-induced deformation of shale is found to be dependent on organic matter compaction, pyrite spatial evolution, and micro-fracture initiation, propagation, and coalescence. The volume of organic matter decreases with the increase of axial stress; and the spatial distribution of pyrite changes at different loading stages, but the effective volume is almost the same. The formation of macroscopic fractures similar to 20 degrees oblique to the loading direction was observed. The cracks initiate in the tensile cracks between the bedding plane at the bottom of the sample and shear fractures are composed of tensile cracks connected by an "X" shape. The layered deposited structure and weak cementation between layers are the main factors controlling the failure mechanism.
WOS关键词	COMPUTED-TOMOGRAPHY ; HIGH-RESOLUTION ; MECHANICAL-PROPERTIES ; TRIAXIAL COMPRESSION ; ACOUSTIC-EMISSION ; GRANITE ; CREEP ; ROCKS ; CT ; MICROTOMOGRAPHY
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000426941000026
资助机构	National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development program(2017YFC0804609) ; National key technologies Research & Development program(2017YFC0804609) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; 51574014) ; 51574014) ; National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development program(2017YFC0804609) ; National key technologies Research & Development program(2017YFC0804609) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; 51574014) ; 51574014) ; National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development program(2017YFC0804609) ; National key technologies Research & Development program(2017YFC0804609) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; 51574014) ; 51574014) ; National Natural Science Foundation of China(41502294 ; National Natural Science Foundation of China(41502294 ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; Fundamental Research Funds for the Central Universities(2302017FRF-TP-17-027A1) ; National key technologies Research & Development program(2017YFC0804609) ; National key technologies Research & Development program(2017YFC0804609) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; National Key Basic Research Program of China (973 Program)(2015CB060200) ; 51574014) ; 51574014)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/83078]
专题	中国科学院地质与地球物理研究所
通讯作者	Wang, Y.
作者单位	1.Univ Sci & Technol Beijing, Sch Civil & Resource Engn, Dept Civil Engn, Beijing Key Lab Urban Underground Space Engn, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Wang, Y.,Li, C. H.,Hao, J.,et al. X-ray micro-tomography for investigation of meso-structural changes and crack evolution in Longmaxi formation shale during compressive deformation[J]. JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,2018,164:278-288.
APA	Wang, Y.,Li, C. H.,Hao, J.,&Zhou, R. Q..(2018).X-ray micro-tomography for investigation of meso-structural changes and crack evolution in Longmaxi formation shale during compressive deformation.JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING,164,278-288.
MLA	Wang, Y.,et al."X-ray micro-tomography for investigation of meso-structural changes and crack evolution in Longmaxi formation shale during compressive deformation".JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING 164(2018):278-288.