Study on mechanical characteristics and damage mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China

doi:10.1177/0144598719876858

CORC > 力学研究所 > 中国科学院力学研究所 > 流固耦合系统力学重点实验室(2012-)

	Study on mechanical characteristics and damage mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China
	Guo W3 ; Shen WJ(沈伟军)1,2 ; Li XZ 3; Wang N 3; Liu XH 3; Zhang XW 3; Zhou SW 3
刊名	ENERGY EXPLORATION & EXPLOITATION
	2019-09-22
页码	19
关键词	Longmaxi Formation shale mechanical characteristics effective pressure damage mechanism compressive strength
ISSN号	0144-5987
DOI	10.1177/0144598719876858
通讯作者	Shen, Weijun(wjshen763@imech.ac.cn) ; Li, Xizhe(lxz69@petrochina.com.cn)
英文摘要	During the development of shale gas reservoirs, the mechanical parameters of shale rocks are greatly significant to guide reservoir drilling design, reservoir stimulation, scheme design, and wellbore stability evaluation. Compared with conventional gas reservoirs, the mechanical properties of shale gas reservoir are more complex and lack of the comprehensive understanding. In this study, the uniaxial and triaxial compression experiments of the Longmaxi shale in South China were conducted to understand the mechanical characteristics and damage mechanism of shale rocks. Combined with the characteristics of shale microstructure, the effects of the mechanical properties such as mineral composition, deformation, stress-strain, and fracture damage characteristics were analyzed and discussed. The results show that the stress-strain curves of shale are two main types of elastic deformation and elastic-plastic deformation. There is a significant difference in effective pressure of yield platform in different shale post-peak deformation. The effective pressure of rigid shale is 60 MPa while that of other shales is 30 MPa. With the increase of effective pressure, the increase of peak compressive strength decreases gradually, and the effect of effective pressure on compressive strength decreases gradually with the transition from the brittleness to the ductility. The higher the effective pressure of the brittleness to the ductility is, the greater the change of compressive strength with effective pressure is, and the smaller the compressive strength under low effective pressure is, the smaller the variation with pressure is. Shale rocks with relatively high brittleness under different effective pressures are mainly characterized by brittle split fracture dominated by tensile fracture, while other shales with low brittleness are dominated by single shear fracture plane.
分类号	Q3
资助项目	National Natural Science Foundation of China[U1762216] ; National Natural Science Foundation of China[11802312] ; National Science and Technology Major Project of the Ministry of Science and Technology of China Project[2016ZX05037006] ; Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University)[PLN201810] ; Youth Foundation of Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Chinese Academy of Sciences
WOS关键词	NUMERICAL-SIMULATION ; GAS ; ROCK ; DIFFUSION ; STRENGTH ; BEHAVIOR ; FLOW
WOS研究方向	Energy & Fuels
语种	英语
WOS记录号	WOS:000490092200001
资助机构	National Natural Science Foundation of China ; National Science and Technology Major Project of the Ministry of Science and Technology of China Project ; Open Fund of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Southwest Petroleum University) ; Youth Foundation of Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Chinese Academy of Sciences
其他责任者	Shen, Weijun ; Li, Xizhe
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/80677]
专题	力学研究所_流固耦合系统力学重点实验室(2012-)
作者单位	1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing, Peoples R China 2.Chinese Acad Sci, Inst Mech, 15,North 4th Ring Rd, Beijing 100190, Peoples R China; 3.PetroChina, Res Inst Petr Explorat & Dev, Langfang 065007, Peoples R China;
推荐引用方式 GB/T 7714	Guo W,Shen WJ,Li XZ,et al. Study on mechanical characteristics and damage mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China[J]. ENERGY EXPLORATION & EXPLOITATION,2019:19.
APA	Guo W.,沈伟军.,Li XZ.,Wang N.,Liu XH.,...&Zhou SW.(2019).Study on mechanical characteristics and damage mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China.ENERGY EXPLORATION & EXPLOITATION,19.
MLA	Guo W,et al."Study on mechanical characteristics and damage mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China".ENERGY EXPLORATION & EXPLOITATION (2019):19.