Abstract：A large amount of wastewater produced during gas field operation is usually decontaminated and re-injected for gas production.As the injected water is in the underground for a long time,it may lead to safety accidents and even cause environment pollution if not properly handled.Therefore,it is necessary to monitor the water flow direction and affected range in the injection process.To prevent this problem we use microseismic to monitor water re-injection process.We adopt the source-velocity joint inversion to optimize velocity models,and use the scanning superposition algorithm to locate microseismic events.Based on the positioning results of microseismic events,water channels are depicted,the water expansion zone is estimated,and safety risks in the injection process are predicted.So water injection parameters can be adjusted in time.Our application results show the following observation:①The injected water is basically stored in targets during the monitoring period,there is no serious water leakage into other strata; ②The injected water may expand to some minor faults and small fractures in the zone; and it flows easily along these faults and fractures.Our application demonstrates that the microseismic monitoring can be very useful in monitoring water injection process.
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