Assessment of the energy potential of the Beregovsky geothermal system, Ukraine

Abstract

The Beregovsky area is one of the prospective geothermal areas of the Ukraine. It is a typical low-temperature geothermal area with temperatures up to 68 C. About 15 wells have been drilled in this territory for various purposes. In all the boreholes, well logging, well tests and geochemical sampling of thermal water have been carried out. On the basis of these data a geothermal resource assessment for the Beregovsky area is attempted. By using preliminary estimates of reservoir properties, a volumetric assessment and a random distribution study (Monte Carlo method) of the geothermal production capacity were carried out. It is estimated that the energy potential of the Beregovsky geothermal area is 1.23 ×1017 J and the possible direct use potential (e.g. space heating) produced for a 25-year period is estimated to be about 15 MWt. Analysis of well test data was carried out using graphical methods (Semi-log and Horner methods) and the VARFLOW computer software. The results of this analysis indicates that the average transmissivity of the Beregovsky reservoir is about 0.5×10-5 m3 Pa-s. Finally, a lumped parameter model using the LUMPFIT computer program is used to simulate the Beregovsky geothermal area. The model was, consequently, used for predicting the reservoir response to three constant production rate cases over the next 10 years.