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Report No.
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Estimation of upscaled hydraulic conductivity profiles along a borehole in low permeability crystalline rock using discrete fracture network models

Hashimoto, Shuji*; Saegusa, Hiromitsu; Tanaka, Tatsuya*; Ando, Kenichi*; Bruines, P.*

It is useful to estimate profiles of the equivalent hydraulic conductivity for groundwater flow modeling based on an equivalent porous medium approach that are used for hydrogeological characterization at over the several kilometers scale. In this study, a combined interpretation of core observations, BTV and fluid logging has been used to identify and classify water-conducting features (WCFs) among observed fractures in deep boreholes around the MIU construction site in Phase I. Transmissivity profiles of WCFs were determined by the interpretation of fluid logging and the results of short interval packer tests. An equivalent hydraulic conductivity for the sub-divided block is calculated using a hydraulic discrete fracture network (hydroDFN) model based on the information, and is confirmed the validity using long interval packer test results. Groundwater flow analyses using developed hydroDFN model are also carried out to assess groundwater flow conditions around galleries.

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