干旱区生态环境知识资源中心(Arid): Fracture Permeability Evolution in Rock from the Desert Peak EGS Site.

Arid

报告编号	DE200515014075
	Fracture Permeability Evolution in Rock from the Desert Peak EGS Site.
	Carlson, S. R; Roberts, J. J; Detwiler, R. L; Burton, E. A; Robertson-Tait, A; Morris, C.
英文摘要	Fluid flow experiments are being conducted on core specimens of quartz monzonite retrieved from depths of about 1 km at the Desert Peak East EGS site in Churchill County, Nevada. Our immediate goal is to observe permeability evolution in fractures at pressure and temperature conditions appropriate to the Desert Peak geothermal site. Longer term, we aim to evaluate mechanisms that control the evolution of fracture permeability. In the experiments saline water is flowed through an artificial fracture at a constant rate of 0.02 ml/min over a period of several weeks. The constant flow tests are interrupted at selected times for shorter tests in which flow is either stopped or varied between 0 and 2.0 ml/min. The experiments to date were conducted at a confining pressure of 5.5 MPa, pore pressures of 1.38 MPa or 2.07 MPa and temperatures of 167- 169 C. Measurements include differential pressure and electrical resistance across the specimen. The short-term variable flow rate experiments allow us to calculate the effective hydraulic aperture of the fracture at various times during the experiment. Changes in electrical resistivity provide indirect evidence of ongoing mineral dissolution and precipitation processes that are expected to change fracture permeability over time. The early experiments have shown that electrical resistivity rises during flow and falls during intervals in which flow is stopped.
英文关键词	Fluid flow Fracture permeability Quartz monzonite Desert Peak (Nevada) Geothermal site Fractures Pressure Temperature Saline water Flow tests Measurements Electrical resistivity Mineral dissolution Enhanced geothermal systems (EG
出版年	2005
语种	英语
国家	United States
URL	http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=59fd6be031c97d1d54ae3c67
来源机构	Technical Information Center Oak Ridge Tennessee
资源类型	科技报告
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/273309
推荐引用方式 GB/T 7714	Carlson, S. R,Roberts, J. J,Detwiler, R. L,et al. Fracture Permeability Evolution in Rock from the Desert Peak EGS Site.,2005.