Controlling fluid-induced seismicity during a 6.1-km-deep geothermal stimulation in Finland
Controlling fluid-induced seismicity during a 6.1-km-deep geothermal stimulation in Finland
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DOI：
10.1126/sciadv.aav7224
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发表时间：
2019-05-01
期刊：
影响因子：
13.6
通讯作者：
Wollin, Christopher
中科院分区：
文献类型：
--
作者：
Kwiatek, Grzegorz;Saarno, Tero;Wollin, Christopher
我们发现，近实时地震监测流体注入允许控制诱发地震的刺激过程中的一个6.1公里深的地热井附近的赫尔辛基，芬兰。在2018年6月至7月的49天内，共有18，160立方米的淡水被泵入结晶岩中。地震监测由24个测站的钻孔地震仪网络进行。使用近实时信息诱发地震率，位置，震级，地震和水力能量的演变，抽水要么停止或变化，在后一种情况下，井口压力为60和90 MPa之间，流量为400和800升/分钟。这一过程避免了核项目停止规模M-W 2.0诱发地震，由地方当局设定的限制。我们的研究结果提出了一个可能的物理为基础的方法来控制刺激引起的地热项目的地震活动。
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(3) 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 M-W 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.