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GEOTHERmAl ENERGy Geomechanics In the near future the developments in Enhanced Geothermal Systems (EGS) will make it possible to start geothermal projects in less favourable geological settings. However, hydraulic stimulation treatments at depths of more then 4000 m are necessary. This introduces new challenges. To face these challenges TNO participates in the ‘Geothermal Engineering Integrating mitigation of Induced Seismicity in Reservoirs’ project (GEISIR). TNO’s extensive knowledge in geomechanics contributes in this research programme addressing issues like the mitigation of induced seismicity to an acceptable level. Geothermal energy resources will play an important role in our future energy supply. Geothermal resources are already successfully used in locations with favourable geological conditions. Technologies such as hydraulic stimulation treatments to enhance the productivity of geothermal wells (EGS: Enhanced Geothermal Systems) can be applied to make geothermal projects in less favourable geological settings economically successful. Hydraulic stimulation (i.e. the injection of fluids to enhance the productivity of a geothermal well) induces micro-seismicity at the location of the geothermal site. In a limited number of geothermal sites, hydraulic stimulation resulted in unwanted larger magnitude seismic events, which caused either damage or public disturbance. In the EU-granted project GEISER, TNO joins forces with other European research institutions and industrial partners to develop strategies for the mitigation of EGS-related seismicity to an acceptable level. Experience from several geothermal sites, such as the Basel geothermal site and Soultz-sous-forêts (France), is used to improve our understanding of the processes that cause induced seismicity. The key issues of GEISER are: − understanding of the geomechanical processes which lead to EGS related induced seismicity; − quantification of the seismic hazard related to EGS, depending on both geological setting and geographical location; − development of strategies for the mitigation of induced seismicity, such as ‘soft stimulation techniques’: hydraulic stimulation without producing larger magnitude seismicity; − development and use of reliable seismic monitoring networks; − to formulate guidelines for site selection, site development and the safe deployment of future geothermal plants; − to formulate guidelines for licensing for local authorities. 7PDF Image | Geothermal Energy
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