dr. grzegorzkwiatekcomplexity science seminar controlling fluid-induced seismicity during a...

Complexity Science Seminar Controlling Fluid-Induced Seismicity during a 6.1-km-deep Geothermal Stimulation in Finland Wednesday, October 31 2018, 3:00 PM Earth Sciences 115 We show that near-realtime seismic monitoring of fluid injection allowed control of induced earthquakes during the stimulation of a 6.1 km-deep geothermal well near Helsinki, Finland. A total of 18,160 m3 of fresh water was pumped into crystalline rocks over 49 days in June-July 2018. Seismic monitoring was performed with a 24-station borehole seismometer network. Using near-realtime information on induced- earthquake rates, locations, magnitudes, and evolution of seismic and hydraulic energy, pumping was either stopped or varied – in the latter case, between wellhead-pressures of 60-90 MPa and flow rates of 400- 800 l/min. This procedure avoided the nucleation of a project-stopping magnitude M 2.1 induced earthquake, a limit set by local authorities. Our results suggest a possible physics-based approach to controlling stimulation induced seismicity in geothermal projects. Dr. Grzegorz Kwiatek GFZ German Research Centre of Geosciences & Free University in Berlin Everyone is welcome!

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Complexity Science Seminar

Controlling Fluid-Induced Seismicity during a 6.1-km-deep Geothermal Stimulation in

Finland

Wednesday, October 31 2018, 3:00 PM Earth Sciences 115

We show that near-realtime seismic monitoring of fluid injection allowedcontrol of induced earthquakes during the stimulation of a 6.1 km-deepgeothermal well near Helsinki, Finland. A total of 18,160 m3 of freshwater was pumped into crystalline rocks over 49 days in June-July2018. Seismic monitoring was performed with a 24-station boreholeseismometer network. Using near-realtime information on induced-earthquake rates, locations, magnitudes, and evolution of seismic andhydraulic energy, pumping was either stopped or varied – in the lattercase, between wellhead-pressures of 60-90 MPa and flow rates of 400-800 l/min. This procedure avoided the nucleation of a project-stoppingmagnitude M 2.1 induced earthquake, a limit set by local authorities.Our results suggest a possible physics-based approach to controllingstimulation induced seismicity in geothermal projects.

Dr. Grzegorz KwiatekGFZ German Research Centre of

Geosciences & Free University in Berlin

Everyone is welcome!

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