Geochemistry of Geothermal Fluids Workshop

University of Miskolc – Hungary – 26-27 October 2017

Sharing the knowledge and technology of geothermal energy is cruical for the further development of this resource. This workshop brings together the running geothermal projects funded by the Horizon 2020 programme of the European Commision. The aim of the workshop is to provide a glimpse to the geochemical aspects of geothermal fluids, promoting cross-fertilisation between different projects, providing a forum for the exchange of scientific knowledge and facilitating synergies between the projects.
Project Contact person Email Institution
CHPM2030 Eva Hartai University of Miskolc, Hungary
DESCRAMBLE Ruggero Bertani ENEL, Italy
DESTRESS Simona Regenspurg GFZ Potsdam, Germany
GEMex Matteo Lelli CNR, Italy
GEOWELL Pierre Durst BRGM, France
MATChING Ben Laenen VITO, Belgium
SURE Jörg Zotzmann GFZ Potsdam, Germany



Thursday, 26 October

09:00-10:00        Registration

10:00-10:10        Welcome address by Péter Szűcs, dean of the Faculty of Earth Science and Engineering, University of Miskolc

10:10-10:20        Introduction to the workshop by Simona Regenspurg, GFZ Potsdam

Session 1: Introduction and geochemical aspects of the represented H2020 geothermal projects (Chair: Tamás Madarász, UNIM)

10:20-10:40        Eva Hartai (UNIM): Introduction and geochemical aspects of the CHPM2030 project

10:40-11:00        Giordano Montegrossi (CNR): Introduction and geochemical aspects of the DESCRAMBLE project

11:00-11:20        Simona Regenspurg (GFZ Potsdam): Introduction and geochemical aspects of the DESTRESS project

11:20-11:40        Coffee break

11:40-12:00        Giordano Montegrossi (CNR): Introduction and geochemical aspects of the GEMex project

12:00-12:20        Pierre Durst (BRGM): Introduction and geochemical aspects of the GEOWELL project

12:20-12:40        Ben Laenen (VITO): Introduction of and geochemical aspects the MATChING project

12:40-13:00        Jörg Zotzmann (GFZ Potsdam): Introduction of the SURE project, evaluation of scaling inhibitors at laboratory scale

13:00-14:00        Lunch break

Session 2: Fluid characterisation, metal mobilisation (Chair: Simona Regenspurg)

14:00-14:20        Ladislaus Rybach (ETH Zurich): Hydrogeochemistry of warm inflows in tunneling – technical risks and geothermal chances

14:20-14:40        Chris Rochelle (BGS): Enhancing metal leaching in geothermal systems

14:40-15:00        Péter Szűcs (UNIM): Typical compositions of geothermal fluids in Hungarian concession areas

15:00-15:20        Marcos Aurelio Gomes da Silva (UFJF): The chemical origin of limestones

15:20-15:40        Coffee break

Session 3: Fluid-rock interaction, monitoring (Chair: Éva Hartai)

15:40-16:00        Justine Mouchot (ES Géothermie): History of Soultz-sous-Forêts geothermal site, geochemical monitoring and sustainability evolution of well GPK4

16:00-16:20        Xiangzhao Kong (ETH Zurich): Evolution of hydrogeochemical properties during reactive flow-through experiments using CO2-bearing solution

16:20-16:40        Maren Brehme (GFZ Potsdam): Physical, chemical and biological processes and their coupling effects in a low-enthalpy geothermal reservoir

16:40-17:00        Chris Rochelle (BGS): CO2-water-rock reactivity at hydrothermal temperatures: The ’BigRig2’ experiment

19:00                    Dinner

Friday, 27 October

Session 4: Discussion

09:00-10:50       Moderated discussion on questions raised on the former day

10:50-11:10       Coffee break

11:10-13:00       Moderated discussion on potential future projects

  • Chemistry of fluids including supercritical fluids
  • Scaling and corrosion
  • Metal mobilisation
  • Mineral and metal recovery
  • Simulation tools: state of the art, reactive transport, flow in porous media
  • Fluid-rock interactions
  • Sampling methodology in supercritical conditions
  • Chemical and mechanical stimulation

Maren Brehme

Maren Brehme is PostDoc at the International Center for Geothermal Research at GFZ Potsdam. She holds a Dipl.-Ing. (Hydrogeology) from TU Berlin and a Dr. rer. nat. from University of Göttingen (GAUSS). Areas of her expertise are geothermal reservoir characterization, enhancing reservoir performance and its sustainable use. Those include also broad experience in hydraulic, thermal and chemical data analysis and a fundamental background in thermal-hydraulic reservoir simulations.

Éva Hartai

Éva Hartai is a geologist, EurGeol, Honorary Associate Professor at the Institute of Mineralogy and Geology, University of Miskolc. She got an MSc degree from Eötvös Loránd University, Budapest, Hungary and a PhD from the Technical University Kosice, Slovakia. Her research area is ore geology. She has 40 years of teaching experience at University of Miskolc, leading courses related to basic geology, environmental geology, geochemistry and mineral resources. She is the coordinator of the EFG Panel of Experts of Education, and the editor-in-chief of the European Geologist journal. She has taken part in several EU-funded and national projects, in most of them as a coordinator. Recently she coordinates the CHPM2030 project.

Xiangzhao Kong

Xiangzhao Kong is currently a senior scientist in Geothermal Energy and Geofluids (GEG) Group in the Institute of Geophysics, ETH Zurich, Switzerland. After receiving his Bachelor and Master degrees in Thermal Science & Energy Engineering at the University of Science & Technology of China in Hefei, China, he earned his doctorate in 2010 under the supervision of Prof. Dr. Wolfgang Kinzelbach in Environmental Engineering at ETH Zurich. From 2010 to 2013, he worked as a postdoctoral researcher in the Department of Earth Sciences at the University of Minnesota. Then he joined the School of Civil Engineering at the University of Queensland as a Research Fellow (Level B) in Brisbane, Australia. In 2015, he moved back to Zurich and joined the GEG Group in ETH Zurich.

Ben Laenen

Ben Laenen graduated as a geologist in 1992 and obtained a PhD in Sciences – Geology in 1997 at the Catholic University of Leuven (Belgium). His PhD thesis dealt with the geochemical signature and origin of sequence stratigraphic cycles recognized in the Boom Clay, a Rupelian clay deposit that outcrops in North Belgium. During his PhD, he specialized himself in the sedimentology, the chemical and petrographical characteristics of unconsolidated sediments and organic geochemistry. After his PhD, Ben Laenen worked 2 years as a post-Doc at the University of Köln (Germany). He studied secondary oil migration in the Bashaw Reef complex (Alberta, Canada). Since 2000, Ben Laenen is employed as a researcher at VITO. He started as junior researcher in the Raw Materials group of the Energy department, mainly working on GIS related project, data management and 3D modeling of the subsurface. From 2006 till 2010, Ben Laenen worked as project leader in the Resources group. He  planned  and  coordinates  projects  in  the  fields  of  geological  exploration,  gas-  and  CO2-storage, waste conversion using CO2 and geothermal energy. In September 2010, he was promoted to position of research coordinator. He is now responsible to define and elaborate the strategic research programs of VITO in the fields of deep geology and geothermal energy.

Justine Mouchot

Justine Mouchot is a junior scientist with a Master degree in Earth Sciences, focused on Fluid/Rock interaction and Petrophysics from University of Strasbourg (France). Miss Mouchot has a five-year experience in applied underground usages (deep geothermal energy and CO2 storage branches) acquired during a first professional experience at European institute for Energy research, Karlsruhe, Germany. She joined ES-Géothermie in June 2017 as geochemical engineer, contributing to EU Destress project – implementation of chemical stimulation at Soultz geothermal site. She is also contributing to the geochemical monitoring (fluid geochemistry, scaling & corrosion issues) of the two geothermal plants, Rittershoffen and Soultz-sous-Forêts.

Simona Regenspurg

Simona Regenspurg is a geologist and geochemist based at the Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences. After working many years in the field of environmental geochemistry at various institutes in the Unites States (Colorado School of Mines), in Sweden (KTH), and in Switzerland (EPFL), since 2009 she is employed at the International Centre for Geothermal Research (ICGR) at the GFZ.  The ICGR is currently involved and coordinates many Horizon2020 projects such as DESTRESS, GEO-Well, SURE, IMAGE, and GeMex. At the ICGR her work covers research within all geochemical topics associated with the exploitation of deep geothermal energy as well as aquifer thermal energy storage (ATES) systems. The focus of her work group “Geofluids” within the ICGR is on understanding and controlling scaling but also on issues of corrosion, and on environmental aspects associated with the exploitation of geothermal energy. For two years she is also guest lecturer at the Freie University of Berlin (FU) at the Department of Hydrogeology.

Chris Rochelle

Chris Rochelle, BSc (Hons) Chemistry with Geochemistry (Leicester University), PhD Geology (Leeds University) is a Senior Geochemist with over 30 years research experience into various aspects of the geochemistry of fluid-rock interactions. Much of this work relates to ‘Energy’ – either in terms of energy supply (e.g. geothermal systems, thermal energy storage, gas hydrates), or the subsurface disposal/storage of waste materials from energy generation (e.g. CO2 capture and storage, radioactive waste). His research interests centre around geochemical process understanding, and to facilitate this, he uses the experimental facilities at the BGS, in particular the Hydrothermal Laboratory. Current geothermal interests include: leading the UK part of two H2020 projects (CHPM2030 – combining heat power and metal extraction; and GEMex – European-Mexican geothermal co-operation), helping lead the geochemistry task in the developing Krafla Magma Testbed (KMT), and contributing geochemical understanding to a new deep, engineered geothermal demonstration project in Cornwall, UK.

Ladislaus Rybach

Ladislaus Rybach is of Hungarian origin, emeritus professor of geophysics at ETH Zurich, co-founder, now Scientific Advisor of ETH spin-off company GEOWATT AG Zurich. He is active worldwide as expert and lecturer, President 2007-2010 of the International Geothermal Association (IGA), Co-founder of the IEA Geothermal Implementing Agreement and Executive Committee Past Chairman; Honorary Doctor and Professor of Eötvös University, Budapest.

Péter Szűcs

Péter Szűcs has been working as a professor of hydrogeology at the Institute of Environmental Management of the University of Miskolc. His special fields are connected to the complex investigations of groundwater flow and geothermal systems. He is also interested in the sustainable utilization of groundwater resources. Improving groundwater modeling tools is also in the focus of his research activity. Péter Szűcs received his PhD title in applied Earth Science from the University of Miskolc in 1996. He obtained the Doctor of Science (DSc) title in hydrogeology from the Hungarian Academy of Sciences in 2009.

Jörg Zotzmann

Jörg Zotzmann is a chemist and has obtained his PhD in the field of Organic Chemistry from Leipzig University in Germany. His research focussed on organic compounds with medicinal interest as well as multifunctional polymers. He holds a MBA degree from Potsdam University with specialisation on project controlling. Since he started research at the GFZ, his interest concentrates on the chemistry of geothermal fluids in general and scaling in particular. In the GFZ fluid-chemistry lab Jörg conducts research on scaling and scaling inhibitors by applying experimental and analytical techniques under high pressure/high temperature conditions. In 2016 he was assigned the administrative manager of the H2020-SURE project.

Note: participation in this event is free. To register, please complete the following form:


The workshop will be held at University of Miskolc, H 3515 Miskolc-Egyetemváros, Building A1, Room 101.







University of Miskolc

University of Miskolc is the largest higher educational institution in the Northern Hungarian Administrative Region. It has eight faculties, over 14 thousand students and two thousand full time academic staff. With its highly qualified academic staff, well equipped laboratories, instruments and equipment, the University is a major research centre of international scientific research and technical development. The series of research activities going on at the university comprise fundamental, applied and development research in the following fields: natural, technical and social sciences, as well as the humanities and arts. Read more:

Established in 1735 as an Academy of Mining, Metallurgy and Forestry, the university is the oldest academic institution dedicated to mining in the European Union. The Faculty of Earth Science and Engineering has more than 280 years of teaching and research experience in relation to mining. The Faculty has wide international cooperation and strong industrial partnerships. International teaching and research programs are carried out in different fields of Earth sciences including mining, minerals processing, environmental and geothermal engineering.

Free time

You can use your free time to visit the unique spa close to the University, in Miskolc-Tapolca and have a bath in a naturally formed swimming pool in a cave (


The national currency in Hungary is the Hungarian forint (HUF). The exchange rate is about 1 EUR = 310 HUF. In general, you can use your credit card anywhere, cash is needed only in specific cases.

Getting from the airport to the hotel

You have to book your flight to Budapest, Ferenc Liszt International Airport. Miskolc is about 180 km east from Budapest. The best option to get from Budapest Airport to your hotel or to the University campus is the airport transfer which takes you ‘from door to door’. The fee for a return transfer is about €60 (HUF 19 000), the travel takes about two hours. You can make the booking directly here:, or send us your travel details and we will arrange the booking for you.

Hotel booking

We suggest you to book a room or an apartment through in the Miskolc-Tapolca area as it is close to the uni campus. When you go to the website, please indicate ’Miskolctapolca’ as the destination. This is a touristic part of the town where the unique spa, the ’Cave Bath’ ( can be found. You will find lots of hotels and apartments here. If you need any assistance in the booking, please contact us: Éva Hartai ( or Andrea Kolencsik-Toth (

Here are the hotels we recommend:

Calimbra Wellness Hotel: (in Miskolc-Tapolca, 10 minutes by bus, about €65 per night)

Hotel Aurora: (In Miskolc-Tapolca, 10 minutes by bus, about €100 per night)

Uni-Hotel: (in the university campus, 5 minutes walk from the venue, about €25 per night).

Hotel Kolibri: (in Miskolc-Tapolca, 10 minutes by bus, about €35 per night)

For a limited number of persons, we can also offer rooms at a modest price in the student hostel in the university campus. Please indicate if you would like to take this option.

Costs of the workshop

Participation in the workshop is free of charge, you have to cover only your meals. Lunch on 26 October will be provided in the university canteen (about €5 per person). Dinner on 26 October will be organised in a restaurant in Miskolc-Tapolca (€10-20 depending on your order).