engleski

Exploration of Geothermal waters in the area of Zagreb

In the Zagreb area there are two springs of subthermal water: Topličica near Gornja Dubravica with temperature ranging from 17O to 18OC, and Sutinska Vrela with temperature of water ranging from 16O to 23OC (Kovačić & Perica, 1998) (Fig. 1). Waters from these springs have never been utilized in an organized way. That there is a significant geothermal potential in the Zagreb area it was understood only by the year 1964. owing to discovery of geothermal water resources by the oil well “ Stupnik-1. Geothermal aquifer is situated in the depth greater than 740m and it is composed of Miocene lithotamnium limestones and Triassic dolomites. By testing of the well during the year 1977. it turned up that natural discharge was 7 l/s while the temperature of water was 57OC. Favourable results initiated complex investigations during the eighties of the last century. During that period 15 boreholes were drilled in the Zagreb area. Few of these pierced the geothermal aquifers with considerably high temperatures. For example: in the area of Blato with the upper limit of the aquifer of about 900m the temperature was 80OC, on the surroundings of the sport center of Mladost the temperature was 65OC, around Sveta Nedela in the depth of 1000m it was circa 65OC, while in the area of Podsused in the depth of 300m it was 65OC.

geothermal water; geothermal energy; Croatia

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