Privacy Policy Disclaimer
  Advanced SearchBrowse




Journal Article

Experimental Rock Characterisation of Upper Pannonian Sandstones from Szentes Geothermal Field, Hungary


Koroncz,  Péter
External Organizations;

Vizhányó,  Zsanett
External Organizations;


Farkas,  Marton Pal
4.8 Geoenergy, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Kuncz,  Máté
External Organizations;

Ács,  Péter
External Organizations;

Kocsis,  Gábor
External Organizations;

Mucsi,  Péter
External Organizations;

Fedorné Szász,  Anita
External Organizations;

Fedor,  Ferenc
External Organizations;

Kovács,  János
External Organizations;

External Ressource
No external resources are shared
Fulltext (public)

(Publisher version), 7MB

Supplementary Material (public)
There is no public supplementary material available

Koroncz, P., Vizhányó, Z., Farkas, M. P., Kuncz, M., Ács, P., Kocsis, G., Mucsi, P., Fedorné Szász, A., Fedor, F., Kovács, J. (2022): Experimental Rock Characterisation of Upper Pannonian Sandstones from Szentes Geothermal Field, Hungary. - Energies, 15, 23, 9136.

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5015103
The Upper Pannonian (UP) sandstone formation has been utilised for thermal water production in Hungary for several decades. Although sustainable utilisation requires the reinjection of cooled geothermal brine into the host rock, only a fraction of the used water is reinjected in the country. UP sandstone formation is reported to exhibit low injectivity, making reinjection challenging, and its petrophysical properties are poorly known, which increases uncertainty in designing operational parameters. The goal of the study is to provide experimental data and to gain a better understanding of formation characteristics that control injectivity and productivity issues in Upper Pannonian sandstone layers. Petrographical characterisation and petrophysical laboratory experiments are conducted on cores retrieved from two wells drilled in the framework of an R&D project at the depth of between 1750 m and 2000 m. The experiments, such as grain density, porosity, permeability, and ultrasonic velocity, as well as thin section, grain size distribution, XRD, and SEM analyses, are used to determine Petrophysical Rock Types (PRT) that share distinct hydraulic (flow zone indicator, FZI) and petrophysical characteristics. These are used to identify well intervals with lower potential for injectivity issues. The results imply that fines migration due to formation erosion is one of the key processes that must be better understood and controlled in order to mitigate injectivity issues at the study area. Future investigation should include numerical and experimental characterisation of formation damage, including water–rock interaction tests, critical flow velocity measurements, and fines migration analysis under reservoir conditions.