000019267 001__ 19267
000019267 005__ 20170118182307.0
000019267 04107 $$aeng
000019267 046__ $$k2017-01-09
000019267 100__ $$aObermann, Anne
000019267 24500 $$aPotential of Ambient Seismic Noise Techniques To Monitor Injection Induced Subsurface Changes

000019267 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019267 260__ $$b
000019267 506__ $$arestricted
000019267 520__ $$2eng$$aOne of the key challenges for the successful developement and operation of deep underground heat exchangers is to control the risk of inducing potentially hazardous seismic events. This was once again highlighted with the failures of two recent deep geothermal energy projects in Switzerland (Basel, 2006, St. Gallen, 2013). We study tiny lapse-time changes in the coda of ambient noise cross-correlations recorded over 1 year including the different project phases. We observe a significant loss of waveform coherence of our measurements that starts with the onset of the fluid injections 4 days prior to the gas kick. We can horizontally and vertically constrain the waveform perturbation to the injection location of the fluid. We interpret the loss of coherence as a local perturbation of the medium due to the fluid injections. Using this case, we show how an ambient seismic noise analysis can be used to assess the aseismic response of the subsurface to well operations and how this method could have helped to recognize the unexpected process much earlier than the microseismic response allowed.

000019267 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019267 653__ $$aambient noise, induced seismicity, monitoring, geothermal energy

000019267 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019267 720__ $$aObermann, Anne
000019267 8560_ $$ffischerc@itam.cas.cz
000019267 8564_ $$s4427042$$uhttps://invenio.itam.cas.cz/record/19267/files/3267.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3267.
000019267 962__ $$r16048
000019267 980__ $$aPAPER