Geothermal evaluation in the northern Serbia using interpretation of hydrocarbon well and seismic data

Abstract

The northern Serbian province Vojvodina is part of Pannonian basin and has very good prospects for utilization of geothermal energy. Previous hydrogeological explorations resulted in drilling several tens of water producing wells with temperatures in the range from 40 to 70 °C mainly used for space heating, balneology and recreation. The extensive hydrocarbon explorations have been conducted in Vojvodina for more than 60 years and significant data of prospective reservoirs of groundwater are collected. According to this, the existence of water with temperatures higher than 100 °C can be expected and aim of this paper is to present area in central Vojvodina next to the Romanian border as one of potential locations. The potential reservoirs are lithologically represented by limestones, sandstones, conglomerates and breccia of Badenian age. By the interpretation of the seismic exploration of the area it is possible to estimate the distribution of the reservoirs at depths from 2500 to 3400 m. On the basis of hydrodynamic measurements and logging measured layer temperatures are in the range of 120-160 °C. Water sampled during completion of hydrocarbon wells belong to the sodium-chloride type with the concentrations of total dissolved solids of 10-30 g/l.