Technical Trends in Rock Physics based Techniques for Interpreting Geophysical Exploration Results

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  • SUZUKI Koichi
    Geosphere Science Sector, Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry

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Other Title
  • 岩石物理学に基づく物理探査結果の解釈技術の動向
  • 岩石物理学に基づく物理探査結果の解釈技術の動向 : 物理探査および物理検層データに対する複合解析の適用
  • ガンセキ ブツリガク ニ モトズク ブツリ タンサ ケッカ ノ カイシャク ギジュツ ノ ドウコウ : ブツリ タンサ オヨビ ブツリケンソウ データ ニ タイスル フクゴウ カイセキ ノ テキヨウ
  • – Application of Combined Analysis to Geophysical Surveys Data and Geophysical Log Data –
  • –物理探査および物理検層データに対する複合解析の適用–

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Abstract

One of the benefits of geophysical exploration is that extensive and continuous surveys are possible at low cost principally though elastic wave velocity and electrical resistivity. Therefore, the techniques that can derive quantitative information on the geological environment from geophysical data are essential for engineering applications. Various studies have been conducted to estimate hydraulic conductivity by combining several well logging data sets using rock physical models for sedimentary and crystalline rocks. In this study, the author calculated the hydraulic conductivity using the models for a soft sedimentary rock site and a granite site. As a result, the calculated values closely match the field and laboratory permeable tests using the rock samples. Next, the author have applied a quantitative analysis for porosity, clay content, and salinity profiles using a combined interpretation of multiple surface geophysical surveys data by using the extended bimodal mixture model. The S-wave velocity and resistivity data have been obtained at a soft sedimentary rock site, composed of the muddy or tuffaceous sandstone and mudstone. The results correlate with the salinities of pore water extracted from borehole core samples. It is expected that these techniques will be effective methods to investigate the shape of the interface of the fresh groundwater and salt water at coastal soft sedimentary rock sites.

Journal

  • Journal of MMIJ

    Journal of MMIJ 129 (5), 151-157, 2013

    The Mining and Materials Processing Institute of Japan

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