【企画講演】 資源探査に関する研究の動向と大規模データプロセッシング

[2K0201-07-03] （学生発表：博士課程） 重力データの3次元逆解析による高温なインドネシア・テラガ地熱システムの地質構造規制の推定

○プラタマ アンガ　バクティ¹、小池 克明¹ (1. 京都大学)

司会：久保 大樹（京都大学）

キーワード：密度分布、重力強調、逆解析、浸透率、熱源

Clarifying the Talaga geothermal system, a high-temperature field indicated by marvelous fumaroles and hot springs, is a critical issue in understanding geological and geothermal structures controlling on the high temperature. To cope with this issue, the gravity data were analyzed and interpreted to determine the structure that controlled the fluid-flow system from the viewpoint of the rock density distribution. Separation of the regional and residual gravity data was also performed with additional derivative anomaly enhancement to derive local, significant features, followed by overlying the surface manifestations and geologic structures with the separation and enhancement results. A noteworthy feature detected is that a complex anomaly contrast is correlated with the appearance of the surface manifestations in the middle study area, which suggests high permeability. The northeastern part shows a correlation of anomaly contrast with the rim structures bounded by the geothermal system. Furthermore, 2D and 3D inversions of the gravity data were conducted to confirm the distribution of subsurface anomaly. The result detected more clearly the zones with high permeability that probably correspond to the reservoir and a heat source in the middle to southern part of the Talaga Geothermal Field.