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Report No.
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Hydraulic test for evaluation of hydrophone VSP

Koide, Kaoru; Yabuuchi, Satoshi*

This hydlraulic test was carried out at the test site of Tono Geoscience Center, Mizunami-shi, Gifu Pref. in order to evaluate the reliability of the hydraulic conductivity estimated from hydrophone VSP experiment. From March to April 1997, we carried out measurements of pore-water pressure at five depths and permeability tests at seven depths down to G.L. -300m, within a borehole drilled in granitic rock. We compared the results of hydraulic test with hydrophone VSP experiment on condition that a single open fracture existed, and we obtained two notable results. First, for the granitic rock at which a single open fracture was found by BTV and also detected by hydrophone VSP experiment, the hydraulic conductivity was 1.54$$times$$10$$^{-7}$$ cm/sec, while for the same granitic rock at which another single open fracture was found by BTV but not detected by hydrophone VSP experiment, the hydraulic conductivity was less than 6$$times$$10$$^{-10}$$ cm/sec. Second, we converted the hydraulic conductivity of 1.54$$times$$10$$^{-7}$$ cm/sec which was obtained in a hydraulic test section of length 2.5m into an equivalent value for a single open fracture of width 1 mm. The converted value (3.8$$times$$10$$^{-4}$$ cm/sec) was similar to the hydraulic conductivity estimated from hydrophone VSP experiment. In conclusion, the hydraulic test results shows that hydrophone VSP is useful to estimate an approximate hydraulic conductivity of a single open fracture.

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