Changes of Slip Rate and Slip-Plane Orientation by Fault Geometrical Complexities During Fluid Injection

doi:10.1029/2019JB017856

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	Changes of Slip Rate and Slip-Plane Orientation by Fault Geometrical Complexities During Fluid Injection
	Zhang, Xi ; Wu, Bisheng ; Jeffrey, Robert G.; Yang, Diansen ; Chen, Weizhong ; Zhang, Fengshou
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
	2019
卷号	124 期号:8 页码:9226-9246
关键词	fluid flow along a fault segments rupturing coherently hydraulic fracture model transient slip patterns permeability changes
ISSN号	2169-9313
DOI	10.1029/2019JB017856
英文摘要	The injection-induced slip of a fault containing along-the-fault geometrical complexities such as permeable cracks, dilational jogs and branches, was studied numerically using a plane-strain hydraulic fracture model. The fault is modeled by placing complexities evenly spaced on either side of the inlet where fluid coming from a steady source is injected at a constant rate. The fault slip obeys the Coulomb friction law with slip weakening of the coefficient of friction. The applied shear stress is less than the residual fault strength, corresponding to a situation where a fault undergoes stable slip behind a slowly advancing rupture front. The numerical results show that the segments of complexity may not only delay slip zone extension and fluid flow, but temporarily increase slip rates. Short-term faster slip rates occur after cracks and jogs are pressurized. The slip rate can reach values typical of microearthquake events, accompanied by rising and then dropping pressure and producing a stress release. Especially, the discontinuous slip sources are separated by the right-angle jogs that do not slip. The slip on branches can be activated by fluid invasion and an associated normal effective stress reduction, and the slow slip sources eventually move from the fault to the branches. Even if a hydraulic fracturing treatment presents a low risk of generating dynamic slip, when fractures intersect faults containing geometrical complexities, fast slip events may be induced. The spatiotemporally varying slip rates and patterns presented provide an alternative interpretation for recorded seismic slip signals.
WOS研究方向	Geochemistry & Geophysics
语种	英语
WOS记录号	WOS:000491283500087
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/14918]
专题	岩土力学所知识全产出_期刊论文
作者单位	1.CSIRO Energy, Melbourne, Vic, Australia; 2.Tsinghua Univ, Dept Hydraul Engn, State Key Lab Hydrosci & Engn, Beijing, Peoples R China; 3.SCT Operat Ltd, Wollongong, NSW, Australia; 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan, Hubei, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xi,Wu, Bisheng,Jeffrey, Robert G.,et al. Changes of Slip Rate and Slip-Plane Orientation by Fault Geometrical Complexities During Fluid Injection[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2019,124(8):9226-9246.
APA	Zhang, Xi,Wu, Bisheng,Jeffrey, Robert G.,Yang, Diansen,Chen, Weizhong,&Zhang, Fengshou.(2019).Changes of Slip Rate and Slip-Plane Orientation by Fault Geometrical Complexities During Fluid Injection.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,124(8),9226-9246.
MLA	Zhang, Xi,et al."Changes of Slip Rate and Slip-Plane Orientation by Fault Geometrical Complexities During Fluid Injection".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 124.8(2019):9226-9246.