Geothermal map — Expected temperatures at depth 3 000 m

The underground geothermal conditions, regardless of the location of aquifers, are represented by suitable geothermal maps. This map represents the expected temperatures at a depth of 3 000 m and is constructed from 214 wells. It is constructed on the basis of the measured temperatures in accessible wells throughout the country. However, since the temperature field depends on the geological composition in depths and tectonic characteristics, the course of isotherms is the result of numerous influences such as thermal conductivity of rocks, permeability and cracking of rocks, all of which are reflected in measured well temperatures. In this depth, radiogen heat in the rocks also has a minor influence. However, the distribution of wells, which were useful for temperature measurements, is very uneven and varies in depth. After temperatures at a depth of 3 000 m, there is a stronger positive anomaly in the north-eastern part of Slovenia, from the Maribor-Rogatec line to the east, while in the eastern part of the Krško basin there is no more anomaly. In the north-eastern part of the country, this is due to the thinner Earth’s crust and the higher conductive heat flow from the Earth’s mantle. Elsewhere, temperatures are much lower.