Numerical estimation of hydrogeological characteristics based on data from cross-hole hydraulic tests

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  • ONOE Hironori
    Crystalline Environment Research Group, Geological Isolation Research and Development Directorate, Japan Atomic Energy Agency
  • SAEGUSA Hiromitsu
    日本原子力研究開発機構地層処分研究開発部門結晶質岩地質環境研究グループ
  • OHYAMA Takuya
    日本原子力研究開発機構地層処分研究開発部門結晶質岩地質環境研究グループ
  • TAKEUCHI Shinji
    日本原子力研究開発機構地層処分研究開発部門結晶質岩地質環境研究グループ

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Other Title
  • 論文 孔間水理試験による水圧応答に基づく地下深部の水理地質構造の解析的推定
  • 孔間水理試験による水圧応答に基づく地下深部の水理地質構造の解析的推定
  • コウカン スイリ シケン ニ ヨル スイアツ オウトウ ニ モトズク チカ シンブ ノ スイリ チシツ コウゾウ ノ カイセキテキ スイテイ

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Cross-hole hydraulic tests in several b oreholes are an efficient technique for estimating hydrogeological characteristics of discrete features distributed between the boreholes. In order to estimate the hydrogeological characteristics of the subsurface, calibration of hydrogeological models was carried out using hydraulic response data from cross-hole hydraulic tests, in the Cretaceous Toki granite in the Tono area.<BR>In the cross-hole hy d raulic tests, similar hydraulic responses in two monitoring boreholes located at different distances from the pumping borehole, were measured. The results show that the hydrogeological conditions in the study area are highly heterogeneous. The hydrogeological model was calibrated with a focus on the geometry of presumed faults, as well as hydraulic parameters of hydrogeological features.<BR>As a result of the study, the trend of hydraulic responses from cross-hole hydraulic tests could be simulated by including faults with low permeability in the hydrogeological model, which define hydrogeological compartments, and major water-conducting features. This study indicates the possibility of predicting the existence of unknown hydrogeological structures by combining crosshole hydraulic tests with calibration of the hydrogeological models.

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