Temperature Variations in Deep Thermal Well LZT-1 in Lądek-Zdrój (Bohemian Massif; SW Poland)—Evidence of Geothermal Anomaly and Paleoclimatic Changes

Barbara Kiełczawa (), Wojciech Ciężkowski, Mirosław Wąsik, Karolina Szostak, Iwona Sieniawska and Marek Rasała
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Barbara Kiełczawa: Department of Mining, Faculty of Geoengineering, Mining and Geology, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Wojciech Ciężkowski: Department of Mining, Faculty of Geoengineering, Mining and Geology, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Mirosław Wąsik: Institute of Geological Science, Faculty of Earth Sciences and Environmental Management, University of Wroclaw, 50-205 Wrocław, Poland
Karolina Szostak: Department of Mining, Faculty of Geoengineering, Mining and Geology, Wroclaw University of Science and Technology, 50-370 Wrocław, Poland
Iwona Sieniawska: Polish Geological Institute—National Research Institute, 00-975 Warsaw, Poland
Marek Rasała: Hydro-Geo-Term, 61-606 Poznań, Poland

Energies, 2024, vol. 17, issue 14, 1-16

Abstract: The thermal water deposit in Lądek-Zdrój (SW Poland) occurs in fractured reservoir rocks, and its hydrogeological regime is controlled by the features of the local geology and lithology of the hosting crystalline complexes, mainly impermeable high-grade metamorphosed mica schists and gneisses. The fractured thermal water aquifer is confined by a thrust fault-type aquitard that creates artesian pressure and, therefore, the water intakes and natural springs in Lądek Zdrój provide spontaneous outflow. Classical geothermometers yield an estimation of reservoir temperatures that ranges from 50 to 70 °C, with a maximum of 88 °C. The heat flux (HF) value of the Lądek-Zdrój region is 64 mW/m 2 . The new borehole, LZT-1, is in the border zone of a local thermal anomaly with a geothermal degree of 25–27 m/°C. The estimated temperature at the bottom of the LZT-1 borehole, under thermal equilibrium conditions, ranges between 70 °C and 80 °C. A stream of heated waters from the deep system flows from the recharge areas, shaping the local geothermal anomaly and thus influencing the thermal conditions in the Lądek-Zdrój area. The activation of this water circulation system occurred in the Pleistocene.

Keywords: geothermal anomaly; thermal waters; heat flux; paleotemperatures; SW Poland (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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