| Abstract |
The locality of Galanta is situated on the northern rim of the central depression of Danube Badin in a partial geological structure-the depression of Galanta. The possibility of obtaining geothermal water for the purpose of power utilization in Balanta has been verified by geothermal boreholes FGG-2 and FGG-3 Galanta. Panonian (Neogene) sands and sandstones represent the aquifers of geothermal water. The temperature of the rock environment at depths 1000 m and 2000 m is 51oC and 91oC respectively. The value of the geothermal gradient is 40oC/km. The average thermal conductivity of the sediments totals 1.94 W/mK and the value of the heat flow density is 79 mW/m2. Hydrochemically, the water is of a sodium-bicarbonate type with total dissolved solids in the range of 4.9-5.9 g/l. The total gas content in the water ranges from 0.096 to 0.39 m3/m3, the highest proportion being represented by carbon dioxide (0.08 to 0.26 m3/m3). The bubble point varies within the depth interval of 15 to 110 m, depending on gas content, proportion of particular components and pressure-thermal conditions at the well-head. The hydraulic parameters of the aquifers are represented by the transmissivity coefficient and the hydraulic conductivity ranging from 4.25 x 10-4 to 2.04 x10-3 m2/s and 4.52x10-6 to 2.22 x10-5 m/s respectively. The storativity coefficient varies around 1.4 x10-4. A lumpfit model and a two-dimensional model were used for evaluation of the geothermal resources at the locality. The model was created on the basis of ling-term measurements. The total available geothermal power was estimated at 32.1 MWt. Complex evaluations of previous hydrodynamic measurements showed that the demanded regime of the exploitation of geothermal water from the both boreholes could not be secured by the free outflow. Therefore, it has been recommended to immerse the submersible pumps in the boreholes. |