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Characterization of fracture permeability with high-resolution vertical flow measurements during borehole pumping.

Ground Water

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Abstract

The distribution of fracture permeability in granitic rocks was investigated by measuring the distribution of vertical flow in boreholes during periods of steady pumping. Pumping tests were conducted at two sites chosen to provide examples of moderately fractured rocks near Mirror Lake, New Hampshire and intensely fractured rocks near Oracle, Arizona. A sensitive heat-pulse flowmeter was used for accurate measurements of vertical flow as low as 0.2 liter per minute. Results indicate zones of fracture permeability in crystalline rocks are composed of irregular conduits that cannot be approximated by planar fractures of uniform aperture, and that the orientation of permeability zones may be unrelated to the orientation of individual fractures within those zones.-Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Characterization of fracture permeability with high-resolution vertical flow measurements during borehole pumping.
Series title:
Ground Water
Volume
25
Issue:
1
Year Published:
1987
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
28
Last page:
40
Number of Pages:
13