The REFLECT project presented the main results of its research on geothermal fluid properties at the Final Conference organised on 19 October 2022 as a side event of the European Geothermal Congress 2022 in Berlin, Germany.

The one problem plaguing almost all deep geothermal operations in the world is related to the chemistry of geothermal fluids. In order to maximise both, the operational efficiency and economic returns of geothermal power plants, it is vital that these systems work well for long periods without requiring significant maintenance. The key to this is preventing or controlling deleterious physical and chemical reactions such as degassing and mineral precipitation that result in corrosion and scaling.

The Horizon2020 REFLECT project, funded by the European Commission, addresses the challenge of determining geothermal fluid properties at in-situ geothermal conditions, i.e., extremely hot or extremely saline fluids. The project has acquired new chemical, physical and microbiological data from sampling of natural fluids and new thermodynamic and kinetic reaction data from experiments in the lab. These data were implemented in predictive models to determine fluid reactions at extreme conditions, and into a comprehensive European Fluid Atlas. REFLECT researchers have also developed a downhole sampler for high-temperature geothermal wells.

The results presented during the Final Conference will enable operators to significantly increase technology performance and reduce maintenance costs or downtimes and, thus, reduce operational costs and increase the number of economically viable geothermal projects.


Download the proceedings of the REFLECT Final Conference.

Session 1, 11:00 – 12:45


The Horizon2020 REFLECT project: Redefining geothermal fluid properties at extreme conditions to optimize future geothermal energy extraction – Download slides

Simona Regenspurg
11:20-11:35 Sampling and laboratory analysis for characterisation of natural high-saline geothermal fluids Joy Iannota, Vera Hehn, Florian Eichinger
11:35-11:50 Assessing microbial diversity in deep geothermal fluids around Europe – Download slides Danaé Bregnard, Alessio Leins, Andrea Vieth-Hillebrand, Simona Regenspurg, Pilar Junier
11:50-12:05 Differentiation of the origin of dissolved organic compounds in geothermal fluids of the Bad Blumau site Alessio Leins, Andrea Vieth-Hillebrand, Simona Regenspurg, Stefanie Pötz, Florian Eichinger
12:05-12:20 Presenting the European Fluid Atlas – Download slides Karoly Kovacs, Anna Seres, Éva Hartai
12:20-12:35 A Downhole Sampler for High-Temperature Geothermal Wells – Download slides Gunnar Skúlason Kaldal, Bjarni Steinar Gunnarsson, Deirdre Clark, Iwona Galeczka, Steinthor Nielson
12:45-13:45 Lunch
13:45-14:30 EGC Poster session
Session 2, 14:30-16:05
14:30-14:45 CO2 degassing kinetics of geothermal fluids – Download slides Chris Boeije, Cas Verweij, Anushka Tripathi, Wolfgang Weinzierl, Pacelli Zitha and Anne Pluymakers
14:45-15:00 Experimental investigation of silica solubility Morten Tjelta
15:00-15:15 Silica polymerization from natural water resources Öykü Çağ Hasköylü, Alper Baba, Mustafa M. Demir
15:15-15:30 Density and heat capacity of geothermal brines: from experimental data to modelling results – Download slides Ulrike Hoffert, Harald Milsch, Sylvain Guignot, Arnault Lassin, Laurent André
15:30-15:45 porousMedia4Foam: An open-source multiphase reactive transport platform based on OpenFOAM® and PHREEQC for geothermal applications – Download slides

Laurent André, Saideep Pavuluri, Cyprien Soulaine


15:45-16:05 Summary of REFLECT: What did we achieve? Simona Regenspurg and the REFLECT Team


Other Talks and Posters in the EGC
Poster: 3D Modelling and Characterization of Stibnite Scale Formation in Germencik Geothermal Site, Büyük Menderes Graben, Western Türkiye  – Download poster
Serhat Tonkul, Alper Baba, Mustafa M. Demir, Simona Regenspurg, Katrin Kieling
Poster: porousMedia4Foam: An open source multiphase reactive transport platform based on OpenFOAM for geothermal applications – Download poster
S. Pavuluri, C. Tournassat, F. Claret, L. André, C. Soulaine
Poster: 3D Modelling and Characterization of Scale Types in Hyper Saline Geothermal System in Tuzla Geothermal Power Plant, NW Türkiye – Download poster Serhat Tonkul, Alper Baba, Mustafa M. Demir, Simona Regenspurg, Katrin Kieling
Talk: Experimental measurements and modelling of thermodynamic properties of NaCl CaCl2 aqueous solutions up to high temperatures and CO2 pressures – Download slides Arnault Lassin, Pedro Felipe dos Santos, Marion
Ducousso, Pierre Cézac, Laurent André