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State-of - the - art of thermal water utilization in the TRANSENERGY region:

State-of - the - art of thermal water utilization in the TRANSENERGY region: current state, potentials and challenges. Nina Rman 1 Nóra Gál 2 , Daniel Marcin 3 , Katarína Benková 3 , Julia Weilbold 4 , Gerhard Schubert 4 , Tadej Fuks 1 , Dušan Rajver 1 , Andrej Lapanje 1 , Annamária Nádor 2

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State-of - the - art of thermal water utilization in the TRANSENERGY region:

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  1. State-of-the-art of thermal water utilization in the TRANSENERGY region: current state, potentials and challenges Nina Rman1 Nóra Gál2, Daniel Marcin3, Katarína Benková3, Julia Weilbold4, Gerhard Schubert4, Tadej Fuks1, Dušan Rajver1, Andrej Lapanje1, Annamária Nádor2 1 Geological Survey of Slovenia 2 Geological and Geophysical Institute of Hungary 3State geological Institute of Dionýz Štúr, Slovakia 4 Geological Survey of Austria Vienna, 24.6.2013

  2. Aimofthisoverview • geothermal energy utilization in the project area (year 2011) • recognition of possible transboundary aquifers • impact of exploitation on regional hydrogeological conditions • potential for increased exploitation • challenges of sustainable geothermal energy utilization

  3. Geothermal energy resource

  4. What is so specialabout regionaland transboundary waterresouces? DRAWDOWN (http://pubs.usgs.gov)

  5. Thermalwaterusers Twellhead > 20°C

  6. Maximumwellhead temperature Twellhead (°C)

  7. Thermalwaterutilization Foto: S.M., K.M., T.F. Bathing and balneology Heating

  8. Thermalwaterutilization P = 180 kWe net T = 110°C Q = 20 l/s M = 18 g/l

  9. Exploitedgeothermalaquifers 11 different aquifers 0.5 to 2 km depth Q = 10-35 l/s high abstraction → pump failures due to sand clogghing Q = 5-10 l/s lots of H2S,CO2→ carbonates scaling → inhibitors Q = 20-30 l/s lots of CO2→ carbonates scaling → inhibitors

  10. Monitoring ofgeothermalwells Groundwater level monitoring • Groundwater level (m) • Momentary yield (l/s) • Cumulative quantity (m3) • Water temperature (°C) • Chemical monitoring • Identify anomalous changes • Sustainable management • Benchmarking indicators

  11. Thermalwaterproduction

  12. Exploitationcharacteristics

  13. Wastethermalwatermanagement sewage

  14. Futuregeothermaldevelopment • Technical potential • 65 inactive users • 94 inactive wells • +7 mio m3annually: • Upper Miocene clasticrocks: +2.8 million m3 • MZ carbonates: +1.7 million m3 • Others: app. + 2.8 million m3

  15. Futuregeothermaldevelopment Hydrogeological potential regional and transboundary aquifers → interferences → numerical models

  16. Futuregeothermaldevelopment • Legislative potential • Applications foror granted water concessions (AT, SI, SK): • +30 mio m3 annually • Heat extraction: • reinjectionwithdoublets • Management of resources: • benchmarking

  17. Conclusions • Utilization status in 2011 : 148 users with 307 active wells • Low temperature resources: direct use and 1 binary electricity power plant • 2 most favourable geothermal aquifers: MZ carbonates & Upper Miocene sand • Indications of overexploitation • Cascade use: improves thermal efficiency and reduces water demand • Inactive geothermal wells • Low and intermediate temperature potential for new drillings • Limited hydrogeological potential can be expanded by reinjection • Monitoring system: comparable and systematic, public data • Sustainable development: pilot models, benchmarking and strategy paper

  18. Interactive webmaps and database of users Thermal water temperature and surface heat flow density http://transenergy-eu.geologie.ac.at/ http://akvamarin.geo-zs.si/users Wellbore database Geological maps Utilization maps Geothermal maps Combination of layers !!! Scale !!!! Temperature at 1000 m and thermal water users Most tapped geothermal aquifers and extent of the Upper Miocene sand

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