Content

The aim of the INRIGeoTeam project is to achieve a scientific breakthrough in understanding the processes of reinjecting thermally used groundwater to heterogeneous and anisotropic intergranular aquifers of the Pannonian Basin and to assess the regional hydraulic and thermal impact of this process. The fundamental scientific starting point of the INRIGeoTeam research is that the expected decrease in injectability during reinjection into the Upper Pannonian intergranular geothermal aquifer in the Pannonian Basin is the result of a combination of several processes. These are related to in-situ geological factors at the regional, local and/or micro level, the ignorance and disregard of which in the dimensioning phase of the reinjection well and the surface use system and also during the dynamics of the doublet operation can cause undesirable physical, chemical or biological processes between the bedrock and the cooled and partly chemically altered thermal water, which lead to a noticeable decrease in injectability and “inefficiency” of the reinjection well. Our basic hypothesis is that reinjection into Upper Pannonian stratified, heterogeneous and anisotropic poorly lithified sandstone with dominant intergranular porosity is effective if the petrophysical and physico-chemical characteristics of this geological medium are taken into account and the prevailing risks for physical, chemical or biological processes that may reduce injectability are previously identified.

The 3rd International Geothermal Summer School took place in Ljubljana (June 30–July 5, 2025) – Collection of abstracts from the student conference.

• Project phases and realization 

There are four activities (DP) planned with several results (R):

DP1  Data digitization and creation of digital twins

R1.1.1 Data organization proposal and tool selection – Achieved 

R1.2.1 GeoZS digital geothermal database – In progress

R1.3.1 3D geological model of pilot area – In progress

R1.4.1 3D numerical hydraulic and geothermal model of pilot area – In progress

DP2  Determination of limiting factors in thermal water reinjection 

R2.1.1 Determination of mineralogical… and geothermal properties of cores – Achieved

R2.2.1 Interpretation of hydraulic and thermal processes during reinjection at laboratory level – In progress

R2.3.1 Introduction to modern laboratory methods in Europe – In progress

R2.3.2 Development plan for a geothermal laboratory at GeoZS – In progress

DP3  Establishment of a research scheme for successful  operation of reinjection

R3.1.1 Identification of key factors for successful reinjection – Achieved

R3.1.2  Proposal of a methodology for determining the impact radius of a doublet – In progress

R3.2.1  Introduction of developed approach into existing guidelines – In progress

DP4  Dissemination of project results

R4.1.1  Four original scientific articles – In progress

R4.1.2:  Four conference papers – Achieved

R4.2.1  Inclusion in the geothermal summer school – Achieved

• Bibliography

RMAN, Nina, LAPANJE, Andrej, GERČAR, David, RAJVER, Dušan, ATANACKOV, Jure, BORKO, Karlo. Planning a successful reinjection in loose sandstone geothermal aquifers in the western Pannonian basin. V: Interacting groundwater : World Groundwater Congress : IAH 2024, Davos, Switzerland : 8. – 13. 9. 2024. [S. l.: org. odb., 2024]. 1 str. https://express.converia.de/frontend/index.php?page_id=35868&v=List&do=15&day=all&ses=32921#. [COBISS.SI-ID 208993027]

RMAN, Nina, LAPANJE, Andrej, MILER, Miloš. Investigating reinjection risks in loose sandstones : lecture at the Geothermal resources for energy transition, IGCP 636 Workshop, 23-29 September 2024, Pisa. [COBISS.SI-ID 209071363]

RMAN, Nina, LAPANJE, Andrej, MILER, Miloš, JANŽA, Mitja. Public information to foster deep geothermal development in Slovenia. V: Geotermalna energija u energetskoj tranziciji Bosne i Hercegovine : regionalno naučno-stručno savjetovanje : Sarajevo, 20. novembar 2024 : knjiga sažetaka. Sarajevo: Akademija nauka i umjetnosti Bosne i Hercegovine, 2024. Str. 19-20 . [COBISS.SI-ID 216978691]

GERČAR, David, ATANACKOV, Jure, ADRINEK, Simona, LAPANJE, Andrej, JANŽA, Mitja, RMAN, Nina. Pomen negotovosti geološke zgradbe za razvoj rabe geotermalnih virov Panonskega bazena (severovzhodna Slovenija). V: ROŽIČ, Boštjan (ur.). Razprave, poročila = Treatises, reports : 27. posvetovanje slovenskih geologov = 27th Meeting of Slovenian Geologists. 27. posvetovanje slovenskih geologov = 27th Meeting of Slovenian Geologists, Ljubljana, april, 2025. Ljubljana: Univerza v Ljubljani, Naravoslovnotehniška fakulteta, Oddelek za geologijo, 2025. 27, str. 36-41. Geološki zbornik, 27. ISSN 0352-3802. [COBISS.SI-ID 234061571]

RMAN, Nina, LAPANJE, Andrej, RAJVER, Dušan, MEGLIČ, Petra, MILER, Miloš. Informacije za razvoj projektov direktne rabe termalne vode in premagovanje izzivov reinjekcije. V: ROŽIČ, Boštjan (ur.). Razprave, poročila = Treatises, reports : 27. posvetovanje slovenskih geologov = 27th Meeting of Slovenian Geologists. 27. posvetovanje slovenskih geologov = 27th Meeting of Slovenian Geologists, Ljubljana, april, 2025. Ljubljana: Univerza v Ljubljani, Naravoslovnotehniška fakulteta, Oddelek za geologijo, 2025. 27, str. 119-124. Geološki zbornik, 27. ISSN 0352-3802. [COBISS.SI-ID 234340867]

RMAN, Nina, RAJVER, Dušan, LAPANJE, Andrej. Poročilo o geotermičnih meritvah v globoki geotermalni vrtini MD-1/05 pri Mislinjski Dobravi. Ljubljana: Geološki zavod Slovenije, 2025. 17 str., 1 f. zganj. pril. [COBISS.SI-ID 230895875]

RMAN, Nina, RAJVER, Dušan, LAPANJE, Andrej. MALENŠEK ANDOLŠEK Neža, MARKIČ Miloš idr. Poročilo o geotermičnih meritvah in analizi vzorca ”plinskega kondenzata” iz globoke vrtine Or-1g/05 v Hardeku pri Ormožu, Ljubljana: Geološki zavod Slovenije, 2025. (še ni vpisano v COBISS)

RMAN, Nina (ur.). Coupling and integration of energy piles with other geothermal technologies : COST action CA21156 european network for FOstering Large-scale ImplementAtion of energy GEostructure (FOLIAGE) : The 3rd international summer school in Thermogeology in Slovenia : International geothermal summer school : 30th June-5th July 2025 : book of abstracts of the student conference of the training school. Ljubljana: Geological Survey of Slovenia, 2025. Str. 11. ISBN 978-961-6498-82-1. [COBISS.SI-ID 238970371]

Malenšek Andolšek, N., Lapanje, A., Marinović, S., & Markič, M. (2026). Geokemična ocena tekočega ogljikovodika iz vrtine Ormož-1g (SV Slovenija). Geologija, 69(1), 77–91. https://doi.org/10.5474/geologija.2026.004