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| | Abstract | | Hydraulic fracturing in Fukumezawa was implemented as the first case in Japan in November 2014. We conducted realtime microseismic monitoring in order to know how fracturing network grows and monitor whether critical microseismic event has occurred or not. By concerning displacement spectrum of noise data, we found that observed data was satisfied good signal to noise level enough to detect microseismic events. All 5 stages of hydrofracturing were planed. Consecutive microseismic events were detected when pressure in the production well became high. We concluded that observed events has decent magnitude and location, thus it has no critical effects to environment such as induced seismicity, or underground water pollution. The relation between magnitude and cumulative number of events shows that typical increase of events stimulated by hydraulic fracturing. |
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