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The MEET Special Issue aims at showing the gains in geothermal energy that can be achieved using a variety of techniques, depending on the geological setting of the underground. Among the list of exploitation concepts, enhanced geothermal systems (EGS) are particularly interesting, as their application is much less dependent of the underground setting, allowing, in turn, a large geographical deployment and market penetration in Europe. The challenges of EGS are multiple in terms of investment costs, the testing of novel reservoir exploitation approaches with an inherent risk of induced seismicity, and the presence of aggressive geothermal brines, damaging infrastructures. The conversion of oil wells or coproduction of heat or electricity together with oil is also addressed. This Special Issue summarizes the output of the H2020 MEET project based on laboratory experiments, geological field works on high-quality analogues, advanced reservoir modeling, the development of a decision-maker tool for investors and specific demonstration activities, such as chemical stimulation or the innovative monitoring of deep geothermal wells, and the production of electrical power via small-scale binary technology tested in various geological contexts in Europe.

Research & information: general --- Soultz-Sous-Forêts --- geothermal site --- heat exchanger --- scales --- sulfates --- sulfides --- As and Sb-bearing galena --- crystal growth --- crystal shapes --- fracture network --- Death Valley --- Noble Hills --- power law distribution --- multiscale analysis --- geothermal reservoir characterization --- Noble Hills granite --- Owlshead Mountains granite --- metamorphic grade --- fluid/rock interactions --- newly formed minerals --- element variations --- geothermal reservoir --- deep geothermal energy --- EGS --- Variscan fold-and-thrust belt --- district heating and cooling --- economic indicators --- CO2 abatement cost --- sensitivity analysis --- fracturing processes --- fluid circulation --- granite alteration --- low to moderate regional strain --- blind geothermal system --- compositional anomalies --- hierarchical clustering --- self-organizing maps --- unconventional reservoirs --- geothermal --- OVSP --- well seismic data --- fault --- fracture --- geothermal derisking --- FWI --- numerical modelling --- inversion --- imaging --- permeability --- fluid–rock interactions --- slate --- temperature --- time-dependent --- pressure solution --- dissolution --- Soultz-sous-Forêts --- hydro-thermal modeling --- conversion --- clustering --- upscaling --- heat --- electricity --- scenarios --- LCOE --- LCOH --- NPV --- CO2 emissions --- Upper Rhine Graben --- geothermal brine --- scaling --- metal sulfides --- thermodynamic --- kinetics --- oil --- corrosion --- geology --- stress --- fluid pressure --- Mohr diagrams --- fracturing --- greywackes --- slates --- deep geothermal reservoir --- structural model --- thermo-hydraulic simulations --- MEET H2020 project --- fracture network variability --- granite --- spacing distribution --- fracture intensity P10 --- well placement --- CO2-EGS --- water-EGS --- discrete fracture networks --- THM modeling --- enhanced geothermal systems (EGS) --- fractured granite --- core flooding experiments --- autoclave experiments --- Cornubian Batholith --- Enhanced Geothermal Systems (EGS) --- Variscan rocks --- quartzite --- claystone --- graywacke --- gouge --- fracture transmissivity --- effective stress --- United Downs --- hydraulic stimulation --- equivalent permeability field --- exposed analogue --- enhanced geothermal system --- fractures --- n/a --- Soultz-Sous-Forêts --- fluid-rock interactions --- Soultz-sous-Forêts --- Iwantja / Indulkana / Granite Downs (SA Central Australia SG53-09)