气候变化领域集成服务门户(CCPortal): Experimental Investigation of Natural Fracture Stiffness and Flow Properties in a Faulted CO2 Bypass System (Utah, USA)

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DOI	10.1029/2019JB018917
	Experimental Investigation of Natural Fracture Stiffness and Flow Properties in a Faulted CO2 Bypass System (Utah, USA)
	Skurtveit E.; Sundal A.; Bjørnarå T.I.; Soldal M.; Sauvin G.; Zuchuat V.; Midtkandal I.; Braathen A.
发表日期	2020
ISSN	21699313
卷号	125 期号:7
英文摘要	Fracture stiffness and flow properties have been measured in the laboratory using naturally fractured fault rock samples from the Little Grand Wash fault, Utah, USA. We compare fracture closure and related flow change during isotropic loading of two fractures which have been subject to various amounts of paleoreactive flow. The two tested fractures are described as (i) a small-aperture fracture (0.1 mm) with negligible geochemical alterations of the fracture surface and (ii) a large-aperture fracture (0.53 mm) where precipitates are observed on the fracture surface. X-ray imaging is used for quantification of fracture aperture and fracture surface contact distribution. The petrographical characterization using scanning electron microscopy and X-ray powder diffraction is performed pretest and describes burial and uplift diagenesis as well as pulses of reactive fluid flow within the fault. The stress-dependent flow and deformation experiment provides new data on fracture stiffness and flow for naturally developed fractures in siliciclastic rock. Fracture stiffness is found to be highest for the small-aperture fracture due to its high-fracture contact ratio and well-developed surface mating during closure. For the naturally altered and rougher, large-aperture fracture, fracture stiffness is lower and a highly stress dependent decay in flow is observed during initial closure. The results illustrate that a natural fracture with high contact ratio and well-mated surfaces will close during loading, whereas a fracture associated with high flow rates and affected by previous geochemical alteration maintains a high flow rate compared to the host rock during similar loading. ©2020. The Authors.
英文关键词	CO2 bypass system; fault zone; fracture flow; fracture stiffness; natural fractures
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187761
作者单位	Norwegian Geotechnical Institute, Oslo, Norway; Department of Geosciences, University of Oslo, Oslo, Norway
推荐引用方式 GB/T 7714	Skurtveit E.,Sundal A.,Bjørnarå T.I.,et al. Experimental Investigation of Natural Fracture Stiffness and Flow Properties in a Faulted CO2 Bypass System (Utah, USA)[J],2020,125(7).
APA	Skurtveit E..,Sundal A..,Bjørnarå T.I..,Soldal M..,Sauvin G..,...&Braathen A..(2020).Experimental Investigation of Natural Fracture Stiffness and Flow Properties in a Faulted CO2 Bypass System (Utah, USA).Journal of Geophysical Research: Solid Earth,125(7).
MLA	Skurtveit E.,et al."Experimental Investigation of Natural Fracture Stiffness and Flow Properties in a Faulted CO2 Bypass System (Utah, USA)".Journal of Geophysical Research: Solid Earth 125.7(2020).