GEOTHERMAL FIELD AND GEOTHERMAL RESOURCES IN BELARUS. V.I. Zuil, Ya.G. Gribik, OA. Martynova, M.A. Dubanevich, E.A. Visilionak. Belarusian State University, Institute for Nature Management, National Academy of Sciences of Belarus, 3Republican Unitary Enterprise “Research and Production Center for Geology” E-mail: zui@bsu.by.

In geologic respect, the considered territory belongs to the western part of the East European Platform. The Precambrian crystalline basement is hidden under the platform cover within the whole area of the country. There are no visible geothermal manifestations at the ground surface, such as geysers, fumaroles, mud volcanoes, etc.

Geothermal investigations in Belarus werefulfilledduring a few decades. A number of geothermal maps were prepared covering the whole studied territory. Among them are temperature distribution maps compiled for a number of depths starting from 100 m till 4 km within the Pripyat Trough, which is the deepest sedimentary basin in the southeastern part of the country, maps of geothermal gradient, heat flow density and geothermal resources distribution.

During the last 5 years, main efforts were directed to summarize all available results to prepare the Geothermal Atlas of Belarus. It was finished in December 2015. The density of geothermal resources was estimated for a number of geothermal horizons. They range from first dozens of kg.o.e./m2for shallow depths till a few t.o.e./m2 in deep seated sedimentary layers of the Pripyat Trough. Some of these resources are exploited in a number of localities mainly using small heat pump installations irregularly distributed within the territory of the country.

Geothermal resources were estimated for several geothermal horizons. No high enthalpy geothermal steam was revealed within the platform cover. Very preliminary estimates show that depths at which it could be possible to reach temperatures of 150-180 °C, necessary to construct geothermal power plants are inside the crystalline basement. It is considered that they are over the economically acceptable limits and the geothermal electricity generation is not considered for the nearest future. The maximal temperature recorded at the base of the platform cover was around 140 °C at the depth of 6.4 km in the Predrechitsa-1 inclined borehole.

Around 150-170 geothermal installations were constructed and put into operation all over the country starting from the middle of nineties of the past century. Several small geothermal systems are under construction each year. All available installations are used for space heating and to produce warm water. The biggest geothermal installation of 1 MWth was constructed at the Greenhouse Complex “Berestye”, located at the eastern suburb of Brest town not far from the Belarus-Poland border. All heat pump installations excluding the latter one are using shallow depth intervals of the platform cover with rather low-enthalpy geothermal resources.