| Summary: | Our WP3 recommendation, in particular, is based on the analysis of induced seismicity in pastsequences from geothermal areas located in different tectonic settings. The geothermal sitesinvestigated include Basel (Switzerland), Berlin (El Salvador), Campi Flegrei (Italy), Krafla,Hengill and Reykjanes peninsula (Iceland), Paralana (Australia), Soultz-sous-Forets (France),and The Geysers, CA (USA). As a general note we strongly recommend to do a qualityassessment of the recorded waveforms, and thereafter to apply four differenttechniques/methodologies for seismological investigations. We recommend to apply (1) arelocation method to reveal small-scale patterns in the induced event location clouds, (2) aspectral ratio technique to improve induced event source parameters, (3) a stress-inversiontechniques to relate reservoir hydraulics to the stress field in situ, and (4) a passive continuousambient seismic noise analysis for imaging changes in mechanical reservoir parametersduring and after shut-in. These methods will provide the basis for the secondary well to bedrilled. The costs for a thorough analysis of the waveform data practically is negligible whencomparing to the costs of a borehole, which should be placed optimally. FP7
|
|---|