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

The Pannonian basin is a major geothermal heat system in Central Europe. Its peripheral basin, the East Slovakian an example of structure with linear, directed flow ranging from 90 to 100 mW/m2 west east. However, use source limited by several critical tectono-geologic factors: (a) Tectonics, and associated disintegration aquifer block multiple deformations during pre-Paleogene, mainly Miocene, period. main discontinuities NW-SE N-S direction negatively affect permeability environment. For utilization, minor NE-SW dilatation open fractures are important, which have been developed sinistral transtension on N–S faults accelerated normal movements southeast. (b) Hydrogeologically, accommodated three water types, namely, Na-HCO3 10.9 g·L−1 mineralization (in north), Ca-Mg-HCO3 0.5–4.5 west), Na-Cl type containing 26.8–33.4 southwest). chemical composition influenced Middle Triassic dolomite aquifer, as well infiltration saline solutions meteoric waters along fractures/faults. (c) Geothermally anomalous 123–129 °C 170 L/s total near Slanské vchy volcanic chain seems be perspective for production.