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Principle investigator:
Prof. Dr. Jochen Kolb


jochen kolb ∂ kit edu

Scientific contact:
Gabriele Wiegand
Dr. Gabriele Wiegand


gabriele wiegand ∂ kit edu

Fabian Nitschke
Dr. Fabian Nitschke


fabian nitschke ∂ kit edu

Dr. Frank Heberling


frank heberling ∂ kit edu

Dr. Joerg Isele


joerg isele ∂ kit edu

Dr. Dietmar Kuhn


dietmar kuhn ∂ kit edu

Geothermal Fluids in Saline Systems

Special issue in Geothermal Energy dealing with field analysis, laboratory experiments and geochemical modeling of the salinity effect.

Geochemical processes in the thermal water circuit

Principle Investigator: Prof. Dr. Jochen Kolb

Geothermal fluids are the key component of geothermal energy because they act as a transport medium of heat. The goal of this cluster is to use the complex composition of the fluids to obtain information about the deep reservoir based on experimental approaches, high-resolution measurement methods and numerical models. An in-depth understanding of the chemical processes also makes it possible to avoid precipitation and scaling in plant components. Such scaling can block pipes as well as the paths in the reservoir and contain chemotoxic elements. Therefore, they represent a key challenge for EGS systems. 





Mineral deposits in the scanning electron microscope:

a) intact scaling surface with (BaSr)SO4 crystals (gray) and nearly idiomorphic Galena crystals (PbS, light gray) (Heberling et al.);

b) sample cross-section of a typical sulfide-scaling with dendritic structure;

c) Detailed picture of a mixed Pb, As, Sb, S phase sulfide scaling (Haas-Nüesch et al.);

d) Cross section through a scaling sample with a sulfide layer at the scaling fluid boundary (Nitschke et al.) .



 Recent publications:

Haas-Nüesch, R.; Heberling, Frank; Schild, Dieter; Rothe, Jörg; Dardenne, Kathy; Jähnichen, Sabine et al. (2018): Mineralogical characterization of scalings formed in geothermal sites in the Upper Rhine Graben before and after the application of sulfate inhibitors. In: Geothermics 71, S. 264–273. DOI: 10.1016/j.geothermics.2017.10.006.

Heberling, Frank; Schild, Dieter; Degering, Detlev; Schäfer, Thorsten (2017): How Well Suited are Current Thermodynamic Models to Predict or Interpret the Composition of (Ba,Sr)SO4 Solid-Solutions in Geothermal Scalings? In: Geothermal Energy 5 (1), S. 9. DOI: 10.1186/s40517-017-0068-x.

Eiche Elisabeth, Göttlicher Jörg, Steiniger Ralph, Duschek Kai, Eggeling Lena, Kölbel Thomas, Neumann
Thomas. Arsenic and lead speciation in geothermal scalings: implications on formation
conditions, Abstracts Goldschmidt2017. 

Nitschke, Fabian; Held, Sebastian; Himmelsbach, Thomas; Kohl, Thomas (2017): THC simulation of halite scaling in deep geothermal single well production. In: Geothermics 65, S. 234–243. DOI: 10.1016/j.geothermics.2016.09.009

Orywall, Pia; Drüppel, Kirsten; Kuhn, Dietmar; Kohl, Thomas; Zimmermann, Michael; Eiche, Elisabeth (2017): Flow-through experiments on the interaction of sandstone with Ba-rich fluids at geothermal conditions. In: Geotherm Energy 5 (1), S. 74. DOI: 10.1186/s40517-017-0079-7.

Schmidt, R. B.; Bucher, K.; Drüpel, K.; Stober, I. (2017): Experimental interaction of hydrothermal Na-Cl solution with fracture surfaces of geothermal reservoir sandstone of the Upper Rhine Graben. In: Applied Geochemistry 81, S. 36–52. DOI: 10.1016/j.apgeochem.2017.03.010. 

Stoll, M.; Huber, F. M.; Schill, E.; Schäfer, T. (2017): Parallel-plate fracture transport experiments of nanoparticulate illite in the ultra-trace concentration range investigated by Laser-Induced Breakdown Detection (LIBD). In: Colloids and Surfaces A: Physicochemical and Engineering Aspects 529, S. 222–230. DOI: 10.1016/j.colsurfa.2017.05.067. 

Stoll, M.; Huber, F. M.; Darbha, G. K.; Schill, E.; Schafer, T. (2016): Impact of gravity, collector surface roughness and fracture orientation on colloid retention kinetics in an artificial fracture. In: Journal of colloid and interface science 475, S. 171–183. DOI: 10.1016/j.jcis.2016.04.045

Orywall, Pia; Dimier, Alain; Kohl, Thomas; Kuhn, Dietmar; Place, Joachim; Zorn, Roman (2015): Experimental Validation of a Numerical Model-Application of an Open Source Algorithm towards Geothermal Conditions. In: IGA (Hg.): World Geothermal Congress. Melbourne, Australia, 19-25 April 2015: Int. Geothermal Association.

Mundhenk, Niklas; Scheiber, Julia; Zorn, Roman; Huttenloch, Petra; Genter, Albert; Kohl, Thomas (2014): Corrosion and Scaling in the Geothermal Cycle of Soultz-sous-Forêts (France). In: NACE Int. - Corrosion Conference Series, January 2014.

Nitschke, Fabian; Scheiber, Julia; Kramar, Utz; Neumann, Thomas (2014): Formation of alternating layered Ba-Sr-sulfate and Pb-sulfide scaling in the geothermal plant of Soultz-sous-Forets. In: NEUES JAHRBUCH FUR MINERALOGIE-ABHANDLUNGEN 191 (2), S. 145–156. DOI: 10.1127/0077-7757/2014/0253