| 講演要旨(和文) | | 平成28年度JOGMEC地熱発電技術研究開発事業「地熱貯留層探査技術」フェーズ2（追加解析）の一環として多種物理探査データの統合解析を実施した。重磁力探査、弾性波探査および物理検層を統合した総合的解析は、それぞれの物理探査精度の向上に加えて、複雑な地質構造の理解の深化にも寄与すると考えられる。そこで地球統計学的手法とマルチアトリビュート解析を組み合わせた統合解析のワークフローを構築し、地熱地域の複雑な地質構造の3次元可視化を試みた。本講演では山川地域の地熱構造発達史を解明する上で重要となる岩相モデルと地熱構造モデルの推定に適用した事例を紹介する。 |
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| | 講演要旨(英文) | | Geophysical techniques had been developed in the JOGMEC Geothermal Demonstration Project since 2013. In the Phase I Project during fiscal year 2015, the 3D surface seismic survey was acquired in the Yamagawa Demonstration Area, located at the city of Ibusuki in Kagoshima, Japan. In the Phase II Project during fiscal year 2016, a wide variety of research studies were carried out using the 3D seismic data. We present the results of a research study focusing on integrated analysis using gravity, seismic and well log data in 3D geothermal modelling. A workflow of 3D geothermal modelling was applied with geostatistical technique and multi-attribute analysis. The integrated workflow included joint/simultaneous inversion to improve the reliability of estimating rock properties for the use of multiple geophysical data. The integrated analysis illustrates a key role in delineating complex geological structures. A rock physics investigation of igneous rocks allows us lithofacies classification for geothermal reservoir characterization. The integrated workflow of 3D geological modelling has an advantage of quantitative interpretation in geothermal exploration and development. |
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