Comparison of shear-induced gas transmissivity of tensile fractures in sandstone and shale under varying effective normal stresses

doi:10.1016/j.jngse.2021.104218

	Comparison of shear-induced gas transmissivity of tensile fractures in sandstone and shale under varying effective normal stresses
	Shen, Nao 3,4; Li, Xiaochun 4; Zhang, Qiang 2; Wang, Lei 1
刊名	JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
	2021-11-01
卷号	95 页码:16
关键词	Tensile fracture Fracture transmissivity Fracture permeability Shear-seepage test Fracture roughness
ISSN号	1875-5100
DOI	10.1016/j.jngse.2021.104218
英文摘要	Hydraulic transport properties of fractures not only control production flow rates in geo-energy reservoirs, but also affect potential leakage in waste/energy storage reservoirs. Here, we performed shear-seepage tests on tensile fractures in sandstone and shale samples under varying effective normal stress conditions. The experimental results show that hydraulic transmissivity of sandstone fractures decreases with imposed shear stress, which may be caused by elastic-plastic deformation of local asperities on the fracture surface. For shale fractures, hydraulic transmissivity stays almost constant at the initial elastic loading stage, followed by a rapid increase until reaching peak shear stress. We interpreted it as a result of brittle damage accumulated on the shale fracture surface. When progressive sliding persists and shear stress remains nearly constant, the corresponding transmissivity is found to be dependent on applied normal stress for both sandstone and shale fractures. This is possibly due to competition between fracture dilation and development of impermeable gouges. The computed tomography analysis reveals that there is a positive correlation between final fracture transmissivity and final sandstone and shale fracture volumes. The comparison of 3D topography analysis of fracture surfaces before and after shearing demonstrates that the sandstone fracture surface gets smoother locally, whereas the local shale fracture surface becomes rougher. In addition, the wear area of sandstone fracture surface is notably larger than that of shale fracture surface under shearing conditions. Our experimental results highlight that shear-induced transmissivity evolution of a tensile fracture depends on the deformation-damage mode of asperities and on applied effective normal stress.
资助项目	National Key R&D Program of China[2019YFE0100100] ; National Natural Science Foundation of China[41972316] ; Postdoctoral Science Foundation of China[2020M671675]
WOS研究方向	Energy & Fuels ; Engineering
语种	英语
出版者	ELSEVIER SCI LTD
WOS记录号	WOS:000702484700001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28550]
专题	中科院武汉岩土力学所
通讯作者	Zhang, Qiang
作者单位	1.GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany 2.PowerChina Huadong Engn Corp, Hangzhou 311122, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Shen, Nao,Li, Xiaochun,Zhang, Qiang,et al. Comparison of shear-induced gas transmissivity of tensile fractures in sandstone and shale under varying effective normal stresses[J]. JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,2021,95:16.
APA	Shen, Nao,Li, Xiaochun,Zhang, Qiang,&Wang, Lei.(2021).Comparison of shear-induced gas transmissivity of tensile fractures in sandstone and shale under varying effective normal stresses.JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING,95,16.
MLA	Shen, Nao,et al."Comparison of shear-induced gas transmissivity of tensile fractures in sandstone and shale under varying effective normal stresses".JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING 95(2021):16.