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SUMMARY:CESS Seminar: STIMTEC – stimulation experiments and their valida
 tion in the Reiche Zeche underground laboratory\, Freiberg\, Germany
DTSTART:20190308T121500
DTEND:20190308T130000
DTSTAMP:20260508T120247Z
UID:560f0273e7fa2e5ff24f4375ea813f2e562971cf6bd7488df74d01fc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Professor Jörg Renner\, Professor for Experimental Geophysi
 cs at Ruhr-Universität Bochum\nThe presentation will cover the ongoing re
 search of the STIMTEC underground experiment designed to investigate the p
 ermeability enhancement associated with hydrofracturing and activation of 
 shearing as for example targeted in deep geothermal projects. We combine p
 eriodic pumping tests\, high resolution seismic monitoring\, structural an
 alysis and drilling into stimulated volumes in an effort to improve near-r
 eal-time monitoring\, phenomenological models of stimulation processes\, a
 nd prognosis strategies. The ongoing experiment is located at the Reiche Z
 eche underground laboratory below Freiberg in Saxony/Germany at a depth of
  about 130 m below surface in metamorphic gneisses. A structural analysis 
 of the test volume enclosed by tunnels preceded the experimental program. 
 The installed seismic network consists of 12 broad-band acoustic emission 
 sensors (sensitivity 1-100 kHz) and three 1-component Wilcoxon accelerome
 ters (sensitivity 50 Hz-25 kHz). The stimulation borehole with 63 m leng
 th was drilled with 15° northward inclination. Previous investigations su
 ggest a strike-slip regime with the maximum horizontal stress striking N35
 0. Field testing was accompanied by a series of laboratory tests on core s
 amples to estimate fracture toughness and elastic properties of the gneiss
 . After an extended campaign characterizing the hydraulics of the test vol
 ume\, ten stimulation tests were performed in the injection borehole durin
 g which a total of > 10000 high frequency events were recorded. Each stimu
 lation stage consisted of a frac stage\, several refracs\, and a subsequen
 t hydraulic testing period. On the basis of the ongoing analyses of test r
 ecords we are currently deciding on the location of three validation boreh
 oles to be drilled in spring 2019.\n\nBio\nAfter his dissertation at the R
 uhr-Universität Bochum (RUB)\, Jörg Renner held postdoctoral fellowships
  and appointments at Massachusetts Institute of Technology with intermitte
 nt stints at GFZ Potsdam as guest scientist and at a borehole-service comp
 any as senior engineer before he became Professor for Experimental Geophys
 ics at Ruhr-Universität Bochum end of 2001. His major research interests 
 are in two strongly linked topics\, subsurface fluid transport and rheolog
 y of rocks. He addresses problems from groundwater flow near the surface t
 o resource recovery from the upper crust to melt transport in the Earth's 
 mantle by performing and analyzing field and laboratory experiments.
LOCATION:GC B3 30 https://plan.epfl.ch/?room=GCB330
STATUS:CONFIRMED
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