Water was injected into the injection well and some of the injected water was recovered from the production well in 1989. Then a production well was drilled to penetrate the reservoirs at around 40 m apart from the injection well in 1988.
According to AE hypocenter location and apparent electrical resistivity anomaly that was described in section 3.3, artificially created reservoir extension was estimated. Three artificial reservoirs were created at different three depths of 400 m, 374 m and 362 m by a newly developed hydraulic fracturing method which was described later in section 3.2. The bottom hole temperature was measured 60 degree C. In 1986 an injection well was drilled into lapilli tuff to a depth of 400 m. We developed the CSAMT method that can survey the resistivity structure deep to 2,000 m, the new hydraulic fracturing method that can produce multiple reservoirs at different depths in a well, an electrical method that can estimate fracture progression direction and a numerical simulation method that can predict water flow in the reservoir and future heat production rate (Kaieda et al., 1990). purposes of this phase were to develop underground structure evaluation methods, artificial reservoirs creation methods, reservoir evaluation methods, and numerical simulation methods for predicting water flow in the reservoir.
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