Critical Tectonic Limits for Geothermal Aquifer Use: Case Study from the East Slovakian Basin Rim

Stanislav Jacko, Roman Farkašovský, Igor Ďuriška, Barbora Ščerbáková and Kristína Bátorová
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Stanislav Jacko: Institute of Geosciences, Faculty BERG, Technical University of Košice, 04001 Košice, Slovakia
Roman Farkašovský: Institute of Geosciences, Faculty BERG, Technical University of Košice, 04001 Košice, Slovakia
Igor Ďuriška: Institute of Geosciences, Faculty BERG, Technical University of Košice, 04001 Košice, Slovakia
Barbora Ščerbáková: Institute of Geosciences, Faculty BERG, Technical University of Košice, 04001 Košice, Slovakia
Kristína Bátorová: Institute of Geosciences, Faculty BERG, Technical University of Košice, 04001 Košice, Slovakia

Resources, 2021, vol. 10, issue 4, 1-15

Abstract: The Pannonian basin is a major geothermal heat system in Central Europe. Its peripheral basin, the East Slovakian basin, is an example of a geothermal structure with a linear, directed heat flow ranging from 90 to 100 mW/m 2 from west to east. However, the use of the geothermal source is limited by several critical tectono-geologic factors: (a) Tectonics, and the associated disintegration of the aquifer block by multiple deformations during the pre-Paleogene, mainly Miocene, period. The main discontinuities of NW-SE and N-S direction negatively affect the permeability of the aquifer environment. For utilization, minor NE-SW dilatation open fractures are important, which have been developed by sinistral transtension on N–S faults and accelerated normal movements to the southeast. (b) Hydrogeologically, the geothermal structure is accommodated by three water types, namely, Na-HCO 3 with 10.9 g·L −1 mineralization (in the north), the Ca-Mg-HCO 3 with 0.5–4.5 g·L −1 mineralization (in the west), and Na-Cl water type containing 26.8–33.4 g·L −1 mineralization (in the southwest). The chemical composition of the water is influenced by the Middle Triassic dolomite aquifer, as well as by infiltration of saline solutions and meteoric waters along with open fractures/faults. (c) Geothermally anomalous heat flow of 123–129 °C with 170 L/s total flow near the Slanské vchy volcanic chain seems to be the perspective for heat production.

Keywords: geotherm; heat flow; permeability; structural modeling; seismic; resources; renewable; utilization; Pannonian basin; East Slovakian basin (search for similar items in EconPapers)
JEL-codes: Q1 Q2 Q3 Q4 Q5 (search for similar items in EconPapers)
Date: 2021
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