IMECH-IR  > 流固耦合系统力学重点实验室
Study on mechanical characteristics and fracture mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China
Guo W; Shen WJ(沈伟军); Li XZ; Wang N; Liu XH; Zhang XW; Zhou SW
Source PublicationEnergy Exploration & Exploitation
2019-09
PagesUNSP 0144598719876858
ISSN0144-5987
Abstract

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.

DOI10.1177/0144598719876858
Indexed BySCI ; EI
Language英语
WOS IDWOS:000490092200001
DepartmentLMFS海洋土力学(LHO)
ClassificationQ3
Ranking1
ContributorLi XZ,沈伟军
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/80459
Collection流固耦合系统力学重点实验室
Affiliation1.Research Institute of Petroleum Exploration and Development, PetroChina, Langfang, China
2.Institute of Mechanics, Chinese Academy of Sciences, Beijing, China
3.School of Engineering Science, University of Chinese Academy of Sciences, Beijing, China
Recommended Citation
GB/T 7714
Guo W,Shen WJ,Li XZ,et al. Study on mechanical characteristics and fracture mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China[J]. Energy Exploration & Exploitation,2019:UNSP 0144598719876858.
APA Guo W.,Shen WJ.,Li XZ.,Wang N.,Liu XH.,...&Zhou SW.(2019).Study on mechanical characteristics and fracture mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China.Energy Exploration & Exploitation,UNSP 0144598719876858.
MLA Guo W,et al."Study on mechanical characteristics and fracture mechanism of the Longmaxi Formation shale in southern Sichuan Basin, China".Energy Exploration & Exploitation (2019):UNSP 0144598719876858.
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