气候变化领域集成服务门户(CCPortal): Stress concentrations at structural discontinuities in active fault zones in the western United States: Implications for permeability and fluid flow in geothermal fields

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DOI	10.1130/B31729.1
	Stress concentrations at structural discontinuities in active fault zones in the western United States: Implications for permeability and fluid flow in geothermal fields
	Siler D.L.; Hinz N.H.; Faulds J.E.
发表日期	2018
ISSN	167606
起始页码	1273
结束页码	1288
卷号	130 期号:2021-07-08
英文摘要	Slip can induce concentration of stresses at discontinuities along fault systems. These structural discontinuities, i.e., fault terminations, fault step-overs, intersections, bends, and other fault interaction areas, are known to host fluid flow in ore deposition systems, oil and gas reservoirs, and geothermal systems. We modeled stress transfer associated with slip on faults with Holocene-to-historic slip histories at the Salt Wells and Bradys geothermal systems in western Nevada, United States. Results show discrete locations of stress perturbation within discontinuities along these fault systems. Well field data, surface geothermal manifestations, and subsurface temperature data, each a proxy for modern fluid circulation in the fields, indicate that geothermal fluid flow is focused in these same areas where stresses are most highly perturbed. These results suggest that submeter- to meter-scale slip on these fault systems generates stress perturbations that are sufficiently large to promote slip on an array of secondary structures spanning the footprint of the modern geothermal activity. Slip on these secondary faults and fractures generates permeability through kinematic deformation and allows for transmission of fluids. Still, mineralization is expected to seal permeability along faults and fractures over time scales that are generally shorter than either earthquake recurrence intervals or the estimated life span of geothermal fields. This suggests that though stress perturbations resulting from fault slip are broadly important for defining the location and spatial extent of enhanced permeability at structural discontinuities, continual generation and maintenance of flow conduits throughout these areas are probably dependent on the deformation mechanism(s) affecting individual structures. © 2018 The Authors.
语种	英语
来源期刊	Bulletin of the Geological Society of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185007
作者单位	Geology, Minerals, Energy and Geophysics Science Center, U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 98025, United States; Nevada Bureau of Mines and Geology, University of Nevada-Reno, 1664 N. Virginia Street, Reno, NV 89557-0178, United States
推荐引用方式 GB/T 7714	Siler D.L.,Hinz N.H.,Faulds J.E.. Stress concentrations at structural discontinuities in active fault zones in the western United States: Implications for permeability and fluid flow in geothermal fields[J],2018,130(2021-07-08).
APA	Siler D.L.,Hinz N.H.,&Faulds J.E..(2018).Stress concentrations at structural discontinuities in active fault zones in the western United States: Implications for permeability and fluid flow in geothermal fields.Bulletin of the Geological Society of America,130(2021-07-08).
MLA	Siler D.L.,et al."Stress concentrations at structural discontinuities in active fault zones in the western United States: Implications for permeability and fluid flow in geothermal fields".Bulletin of the Geological Society of America 130.2021-07-08(2018).