AI Article Synopsis
- - The study demonstrated that real-time seismic monitoring helped manage induced earthquakes during the stimulation of a geothermal well near Helsinki, Finland, by tracking their rates and locations.
- - Over 49 days in 2018, researchers injected 18,160 m of water into deep crystalline rocks, using a network of 24 seismometers to gather data.
- - By adjusting pumping pressure and flow rates based on seismic data, the team successfully avoided a significant earthquake (magnitude 2.0), which was a critical limit set by local authorities.
Article Abstract
We show that near-real-time 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 m of fresh water was pumped into crystalline rocks over 49 days in June to July 2018. Seismic monitoring was performed with a 24-station borehole seismometer network. Using near-real-time 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 well-head pressures of 60 and 90 MPa and flow rates of 400 and 800 liters/min. This procedure avoided the nucleation of a project-stopping magnitude 2.0 induced earthquake, a limit set by local authorities. Our results suggest a possible physics-based approach to controlling stimulation-induced seismicity in geothermal projects.
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Source |
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6494490 | PMC |
| http://dx.doi.org/10.1126/sciadv.aav7224 | DOI Listing |
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