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This chapter provides a comprehensive overview of high- and ultra-high-temperature geothermal fields in Japan and globally. Section 6.1 focuses on major fracture-type geothermal reservoirs in Kyushu, Japan, including Hatchobaru, Takigami, Ogiri, and Yamagawa. These fields are situated within tectonic grabens and volcanic zones, where geothermal fluids circulate through fault-controlled reservoirs. Technologies such as double flash and binary systems are employed, with geophysical methods like magnetotellurics (MT), gravity surveys, and distributed sensing used for reservoir characterization. Section 6.2 explores ultra-high-temperature geothermal challenges, emphasizing the Kakkonda field, where drilling to 3,729 m revealed >500 °C superheated zones within young plutonic rocks. The chapter introduces the brittle-plastic transition and engineered geothermal systems (EGS) in plastic zones. The high-temperature challenges in Kilauea lava lake drilling in the USA, the DESCRAMBLE project in Italy, and the IDDP project in Iceland are briefly reviewed. These case studies underscore the need for integrated geoscience, engineering innovation, and long-term strategies for future geothermal energy development.

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Case Studies I: High- and Ultra-High-Temperature Geothermal Fields in Japan and the World

  • 章节

  • 发表日期：

    2026年

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  • Koichi Tagomori,
  • Naotsugu Ikeda,
  • Ko Sato,
  • Hirofumi Muraoka,
  • Junzo Kasahara

摘要

This chapter provides a comprehensive overview of high- and ultra-high-temperature geothermal fields in Japan and globally. Section 6.1 focuses on major fracture-type geothermal reservoirs in Kyushu, Japan, including Hatchobaru, Takigami, Ogiri, and Yamagawa. These fields are situated within tectonic grabens and volcanic zones, where geothermal fluids circulate through fault-controlled reservoirs. Technologies such as double flash and binary systems are employed, with geophysical methods like magnetotellurics (MT), gravity surveys, and distributed sensing used for reservoir characterization. Section 6.2 explores ultra-high-temperature geothermal challenges, emphasizing the Kakkonda field, where drilling to 3,729 m revealed >500 °C superheated zones within young plutonic rocks. The chapter introduces the brittle-plastic transition and engineered geothermal systems (EGS) in plastic zones. The high-temperature challenges in Kilauea lava lake drilling in the USA, the DESCRAMBLE project in Italy, and the IDDP project in Iceland are briefly reviewed. These case studies underscore the need for integrated geoscience, engineering innovation, and long-term strategies for future geothermal energy development.