| 講演要旨(和文) | | 独立行政法人石油天然ガス・金属鉱物資源が実施する地熱貯留層探査技術開発では，弾性波特性を用いた断裂系探査技術と他の探査データの総合解析手法により，地熱貯留層の位置や形状を高精度で捉える技術の開発を行っている．平成27年度にはフィールド実証試験として，鹿児島県山川地熱地域において弾性波探査が実施された．本実証試験の目的は地熱貯留層の詳細構造把握に弾性波探査が有効であることの実証に加え，取得データにおいて受発振点の間引きテストを実施し，国内の地熱地域の多くが位置する山岳部での弾性波探査における課題である疎なデータ取得配置の影響を掌握し，費用対効果に優れるデータ取得配置を提案することにあった．本講演では山川3次元弾性波探査の成果概要を示すとともに，課題解決に向けた取り組みを紹介する． |
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| | 講演要旨(英文) | | An experimental three-dimensional (3-D) seismic survey was conducted by JOGMEC in the Yamagawa geothermal field, Kagoshima, Japan. The 3-D seismic method reduces geological risks and increases success rates in drilling. However, many of geothermal fields in Japan exist in the mountainous area. Seismic surveys might suffer from a rough topography and complicated geological structure. Since effectiveness and cost of a seismic survey in Japanese geothermal area were the centers of the discussion, the Yamagawa 3-D survey took the following approaches. First, high-density 3-D data were collected to show proper images of the geothermal reservoir. Second, several subsets with different survey designs were extracted and their images were compared to determine the relative cost-effectiveness. |
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