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| | Abstract | | Two reservoirs (upper and lower) were created at different depths of a 1,000 m-deep injection well (OGC-1) in the Ogachi HDR project. The location and the size of these reservoirs were estimated by acoustic emission (AE) hypocenter distribution. A production well (OGC-2) was drilled according to the hypocenter locations to penetrate the reservoirs. Because of low water recovery rate during the initial water circulation test between the wells, hydraulic stimulation operations for improving hydraulic connection between OGC-1 and OGC-2 were conducted in 1994 and 1995. Hypocenters of AE observed these operations distributed around bottom of the wells. Comparing with the tracer tests and temperature logging results, the stimulation operations were effective to improve water flow connection between OGC-1 and OGC-2 and short circuit of the flow path had to occur in the lower reservoir. |
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