Sanjuan, 2017, Supercritical geothermal system - A review of past studies and ongoing research activities: Presented at the 42nd Workshop on Geothermal Reservoir Engineering. Manzella, et al., 2018, The first results of the DESCRAMBLE project: Presented at the 43rd Workshop on Geothermal Reservoir Engineering. Bertani, R., 2017, Drilling toward supercritical fluid: The DESCRAMBLE experience at Larderello: Presented at the Novel Approaches for Geothermal Exploration Conference.The use of high-temperature-tolerant fiber enables the deployment of seismic sensors much closer to the deep target and may investigate effective fluid circulation through production and reducing wells. The Mori Geothermal Power Plant reinjects wastewater at this depth through a reducing well. Our traveltime tomography and forward-simulated synthetic DAS waveforms could indicate the existence of a water layer 250 m long and 50 m thick at 1060 m depth. The DAS waveforms show distinct traveltime discontinuity at 1060 m depth. Although the production zone is located mainly within the Nigorikawa volcanic conduit estimated in the past geothermal analysis, the reflectors are also distributed outside the conduit. Numerous reflectors appear to gather at a depth between 20 m, corresponding to the production zone of the well. An optical fiber system and an array of geophones were installed to 2100 m depth in F-01, a little-deviated high-temperature geothermal production well, and along a road for about 1.2 km on the surface.
We conducted a seismic reflection survey in the Mori-Nigorikawa geothermal field in the Nigorikawa caldera basin. Seismic exploration technologies with distributed acoustic sensing (DAS) are investigated to acquire seismic waves in high-temperature environments and locate supercritical geothermal reservoirs deeper than the brittle-ductile transition boundary in Japan.
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