GSTDTAP  > 地球科学
DOI10.1130/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, Drew L.1; Hinz, Nicholas H.2; Faulds, James E.2
2018-07-01
发表期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2018
卷号130页码:1273-1288
文章类型Article
语种英语
国家USA
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.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000437009200014
WOS关键词SOUTHERN SAN-ANDREAS ; PEAK-DIXIE VALLEY ; GREAT-BASIN ; RANGE PROVINCE ; CENTRAL NEVADA ; MOAB FAULT ; EARTHQUAKE ; EVOLUTION ; MOUNTAIN ; SYSTEMS
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/24665
专题地球科学
作者单位1.US Geol Survey, Geol Minerals Energy & Geophys Sci Ctr, 345 Middlefield Rd, Menlo Pk, CA 98025 USA;
2.Univ Nevada, Nevada Bur Mines & Geol, 1664 N Virginia St, Reno, NV 89557 USA
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Siler, Drew L.,Hinz, Nicholas H.,Faulds, James 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]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2018,130:1273-1288.
APA Siler, Drew L.,Hinz, Nicholas H.,&Faulds, James 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.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,130,1273-1288.
MLA Siler, Drew 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".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 130(2018):1273-1288.
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