<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "D5.5\r\nValidation of model for fluid migration\r\nagainst field site data"^^ . "The S4CE considers a variety of sub-surface geo-energy operations. Among others, the\r\nextraction of resources and energy from the subsurface is commonly linked with hazards like\r\ncollapse of mines or shafts, possible pollution of the subsurface and/or induced seismicity.\r\nThe latter has aroused attention in the previous years due to newly developed techniques for\r\nhydraulically stimulation of rock masses for the extraction of hydrocarbons from lowpermeable shale rocks (e.g., unconventional reservoirs) or enhancing geothermal reservoirs\r\nby massive hydraulic stimulations to create fluid pathways between geothermal wells.\r\nHowever, not only hydraulic stimulations can cause induced seismicity. Injection of wastewater has also been linked to seismicity in the previous years as for example shown by\r\nLangenbruch et al. (2018).\r\nIn order to understand the influence of fluid injections on induced seismicity, the\r\ndeliverable D5.5 “Validation of model for fluid migration against field site data” has been\r\nplanned within the S4CE consortium. The deliverable forms a key aspect within S4CE, since\r\nthe extraction of geothermal energy is part of renewable energy production, which is needed\r\nfor a smooth transition from hydrocarbon-based energy production towards a C02-free\r\nenergy production. It is therefore of importance to reduce the risks related to geothermal\r\noperations and to enable a safe production of this renewable energy.\r\nThe S4CE consortium has access to a few sites across Europe. Among these, the St. Gallen\r\ngeothermal site has been selected because the related recorded seismicity had already been\r\nprocessed by the Swiss Seismological Service (SED). The SED located the seismicity in\r\nSt. Gallen to a depth below the injection well, situated in a most-likely over-pressurized\r\ntrough of Permo-Carboniferous age. The distance from the seismicity to the injection well\r\nmakes the fluid transport mechanism from the well to the Permo-Carboniferous Trough (PCT)\r\nchallenging to understand, since an over-pressurized trough would cause fluids to migrate\r\nupwards rather than downwards. Structural data as well as injection data have been made\r\navailable to the S4CE consortium, which, therefore, makes the St. Gallen data set an excellent\r\ndata set for numerical simulations, which might be a tool for predictions of induced seismicity\r\n(e.g., Meier and Backers, 2017; Gaucher et al., 2015 and references therein). The findings\r\npresented in D5.5 shall provide a better understanding on how injected fluids in fault-based\r\nsubsurface reservoirs can induce seismicity and thereby damage above-surface constructions.\r\nFor this purpose,\r\n a structural subsurface model has been reevaluated and enhanced to accommodate\r\nan over-pressurized PCT beneath the geothermal well\r\n the stress field has been determined\r\n injection data has been collected and implemented into the numerical models\r\n two scenarios have been investigated numerically that could have caused the\r\nobserved seismicity:\r\no poroelastic stress transfer from the well to the PCT\r\no fast transport of the fluid from the well to the PCT via existing fracture systems"^^ . "2020-02" . . "Science For Clean Energy Project"^^ . . . . . . "Tobias"^^ . "Meier"^^ . "Tobias Meier"^^ . . "GEOMECON GMBH"^^ . . . . . . "HTML Summary of #2281 \n\nD5.5 \nValidation of model for fluid migration \nagainst field site data\n\n" . "text/html" . . . "Technology-seismicity interaction" . . . "St. Gallen" . . . "Geothermal energy production" . .