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FiveWell targeting geothermal areasGeothermal area in northern and northeastern Japan were selected for well-targeting case studies. In the Noboribetsu-Carls area, drilling targets were identified through comprehensive analyses of geological correlationsGeological correlation, MT, and electrical surveysElectrical survey. In the Nigorikawa areaGeothermal power plant (Mori geothermal power plant)Mori geothermal power plant, which lies in a funnel-shaped calderaFunnel-shaped caldera, subsequent well targets focus on deeper and west to southwest fracture extensions based on Distributed Acoustic Sensor (DAS)Distributed Acoustic Sensor (DAS) data. The Matsukawa area, Japan’s first commercial geothermal power site, has a naturalVapor-dominated reservor vapor-dominated reservoirNatural vapor-dominated reservoir bounded by low-permeabilityPermeability structures, and potential targets include the boundary of intrusive rocks, the Sumikawa Fault, and deeper zones. In the Tazawako-tobu area, NW–SE to NNW–SSE trending fractures were identified as targets based on geological, geochemical, gravity, temperature, and CSAMTControlled Source Audio-frequency Magnetotelluric (CSAMT) surveys. In the Wasabizawa area (Wasabizawa geothermal power plant), fault and fracture systemsFracture system were elucidated through detailed feed pointFeed point identification and Drilling-Induced Tensile Fracture (DTF) analysis.

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Case Studies II: Well Targeting Field Examples in Japan

  • 章节

  • 发表日期：

    2026年

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  • Ko Sato,
  • Junzo Kasahara,
  • Narimitsu Ito

摘要

FiveWell targeting geothermal areasGeothermal area in northern and northeastern Japan were selected for well-targeting case studies. In the Noboribetsu-Carls area, drilling targets were identified through comprehensive analyses of geological correlationsGeological correlation, MT, and electrical surveysElectrical survey. In the Nigorikawa areaGeothermal power plant (Mori geothermal power plant)Mori geothermal power plant, which lies in a funnel-shaped calderaFunnel-shaped caldera, subsequent well targets focus on deeper and west to southwest fracture extensions based on Distributed Acoustic Sensor (DAS)Distributed Acoustic Sensor (DAS) data. The Matsukawa area, Japan’s first commercial geothermal power site, has a naturalVapor-dominated reservor vapor-dominated reservoirNatural vapor-dominated reservoir bounded by low-permeabilityPermeability structures, and potential targets include the boundary of intrusive rocks, the Sumikawa Fault, and deeper zones. In the Tazawako-tobu area, NW–SE to NNW–SSE trending fractures were identified as targets based on geological, geochemical, gravity, temperature, and CSAMTControlled Source Audio-frequency Magnetotelluric (CSAMT) surveys. In the Wasabizawa area (Wasabizawa geothermal power plant), fault and fracture systemsFracture system were elucidated through detailed feed pointFeed point identification and Drilling-Induced Tensile Fracture (DTF) analysis.