Numerical study on the propagation of tensile and shear fracture network in naturally fractured shale reservoirs

doi:10.1016/j.jngse.2016.11.031

CORC > 地质与地球物理研究所 > 中国科学院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

	Numerical study on the propagation of tensile and shear fracture network in naturally fractured shale reservoirs
	Zhang, Zhaobin; Li, Xiao; He, Jianming; Wu, Yusong; Li, Guanfang
刊名	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
	2017
卷号	37 页码:1-14
关键词	Hydraulic Fracture Stimulation Shale Gas Numerical Modelling Displacement Discontinuity Method
ISSN号	1875-5100
DOI	10.1016/j.jngse.2016.11.031
文献子类	Article
英文摘要	The propagations of tensile and shear fracture are important to the permeability enhancement of the naturally fractured shale gas reservoirs during hydraulic fracturing treatment. In this work, the hydraulic fracturing process is numerically investigated by a newly proposed model based on displacement discontinuity method. Natural fracture network is reconstructed from the shale samples from the Longmaxi formation of China. The small fractures that are difficult to be identified from shale samples are simulated by randomly adding virtual fractures. The model is extensively validated against commercial software and the numerical modelling of previous works. Numerical results show that the shearing of natural fractures may occur before they are reopened by fluid pressure. Moreover, the shear length of natural fractures is much longer than that of the hydraulic fractures. The effects of crustal stress are then investigated. The effects of stress angle, which is the angle between maximum principle stress direction and main natural fracture direction, depend on stress difference. When stress difference is small, the optimal stress angle is 90 degrees here the optimal stress angle is defined as the stress angle when the most complex fracture network could be formed through hydraulic fracturing treatment. By contrast, when stress difference is big, the optimal stress angle is in range from 45 degrees to 60 degrees The effects of stress difference also depends on stress angle. When the stress angle equals to 0 degrees the fracture lengths decrease with stress difference. When the angle equals to 45 degrees the fracture lengths increases with stress difference. When the stress angle equals to 90 degrees the fracture lengths first increase and then decrease with stress difference. (C) 2016 Elsevier B.V. All rights reserved.
WOS关键词	DISPLACEMENT DISCONTINUITY METHOD ; ARBITRARY EVOLVING CRACKS ; HYDRAULIC FRACTURES ; MESHFREE METHOD ; BEHAVIOR ; GROWTH
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000392679900001
资助机构	Chinese Academy of Sciences(XDB10030300 ; National Natural Science Foundation of China(41502306) ; China Postdoctoral Science Foundation(2014M561054) ; XDB10050400) ; Chinese Academy of Sciences(XDB10030300 ; National Natural Science Foundation of China(41502306) ; China Postdoctoral Science Foundation(2014M561054) ; XDB10050400) ; Chinese Academy of Sciences(XDB10030300 ; National Natural Science Foundation of China(41502306) ; China Postdoctoral Science Foundation(2014M561054) ; XDB10050400) ; Chinese Academy of Sciences(XDB10030300 ; National Natural Science Foundation of China(41502306) ; China Postdoctoral Science Foundation(2014M561054) ; XDB10050400)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53136]
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	Li, Xiao
作者单位	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	Zhang, Zhaobin,Li, Xiao,He, Jianming,et al. Numerical study on the propagation of tensile and shear fracture network in naturally fractured shale reservoirs[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2017,37:1-14.
APA	Zhang, Zhaobin,Li, Xiao,He, Jianming,Wu, Yusong,&Li, Guanfang.(2017).Numerical study on the propagation of tensile and shear fracture network in naturally fractured shale reservoirs.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,37,1-14.
MLA	Zhang, Zhaobin,et al."Numerical study on the propagation of tensile and shear fracture network in naturally fractured shale reservoirs".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 37(2017):1-14.