11:45 AM - 12:00 PM
[STT47-11] High-resolution microseismic monitoring for water injection in Okuaizu Geothermal Field, Japan
Keywords:Geothermal reservoir, Micro seismic monitoring , Water injection
In the determination of the microseismic events, arrivals of P- and S-waves were manually picked from 1,000 Hz sampling continuous data. The determined events were further processed by a cluster analysis using waveform coherence to reproduce a high-resolution distribution of microseismic vents. We found that there were three patterns for microseismic events in terms of spatial distribution, which had correlation with the spatial distribution of water flow estimated by well head pressures. The result suggested that the high-resolution microseismic monitoring could indicate water flow associated with the water injection.
This work was partially supported by the “Technology to Evaluate and Manage Geothermal Reservoirs” project sponsored by Japan Oil, Gas and Metals National Corporation (JOGMEC).