Lower Jurassic geothermal reservoir in the Kleszczów area (Central Poland)

The paper presents results of research and drilling works related to realization of Kleszczów GT-1 borehole, performed between July 5th and November 10th, 2009. Geothermal waters will be used for space-heating and recreational purposes in a planned center of sports and recreation. While planning the drilling it was assumed that the exploitation of geothermal waters will be conducted in a closed, extraction/injection well-system. The Lower Jurassic aquifer was assumed as the most favourable reservoir for geothermal use. Drilling of Kleszczów GT-1 well confirmed the significant resources of geothermal waters. The geothermal water obtained is a brine of Cl-Na hydrogeochemical type and of TDS reaching 4.6 g/dm3. Measured well-head temperature was 52.2 stopn.C. On the third drawdown of pumping test the yield of geothermal water to 200.6 m3/h were obtained and the position of dynamic water table was at a depth of 89.9 m which corresponds to measured drawdown. The results of geological work of the Kleszczów GT-1 borehole will be used to design the second borehole (Kleszczów GT-2) for a two wells system