Estimation of an ultra-high-temperature geothermal reservoir model in the Kakkonda geothermal field, northeastern Japan

Abstract

The probable locations of ultra-high-temperature geothermal reservoirs in the Kakkonda geothermal field were modeled under varying conditions using resistivity and temperature data. The results indicate that ultra-high-temperature geothermal reservoirs are likely present at elevations of ≥ –4000 m. The centers of these reservoirs, characterized by low-resistivity and high-permeability values, are approximately in the Kakkonda granite (0.09 ± 0.01 Ma). The area covered by the modeled reservoirs is consistent with estimates from other approaches, such as the microseismic event distribution. This study suggests that an ultra-high-temperature geothermal reservoir is present in the area.