Geothermal Characteristics Of The Krsko Basin, Slovenia, Based On Geophysical Research

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Journal Article: Geothermal Characteristics Of The Krsko Basin, Slovenia, Based On Geophysical Research

Abstract
The Krsko basin with its thermal springs is a syncline, filled with low permeable Tertiary and some Quaternary sediments. Their thickness reaches about 1.8 km in its central eastern part. This is perceivable also in geotherms reflecting a conductive temperature field. In the syncline basement, especially in Triassic and Jurassic carbonates, but less in Cretaceous rocks, convective thermal field predominates. The syncline pattern and structure have been determined from the results of gravimetric, seismic and geoelectrical measurements and deep drilling since 1959. The most important geothermal anomaly is the Catez field with the greatest concentration of investigations. There, the highest borehole temperatures have been reached, ranging from 50 to 64°C. Geothermal anomalies at other localities have been less investigated, and temperatures do not exceed 36°C. Deep boreholes which were available for geothermal measurements are found mostly along the southern rim of the basin. In much wider area the only source of data for the construction of geotherms were geoelectrical soundings, applied to elaborate geothermal maps and cross-sections. This was enabled by a conversion from resistivity and borehole lithology into temperature data, using one-dimensional simplified solution of Laplace's equation. In such a way an approximative knowledge of geothermal conditions below surface and beyond known geothermal anomalies has been extended. Circulation of meteoric water into few kilometers deep fissured and fractured hot zones is the only heating possibility for thermal water in the Catez field. Water circulation is probably the deepest there than elsewhere in the Krsko basin. Taking into account all information collected until now, we assume that geothermal reservoir could extend at least 2-2.5 km deep below the surface.

Authors 
Dusan Rajver and Danilo Ravnik








Published Journal 
Physics and Chemistry of the Earth, Parts A/B/C, 2003





DOI 
10.1016/S1474-7065(03)00064-0


 

Citation

Dusan Rajver,Danilo Ravnik. 2003. Geothermal Characteristics Of The Krsko Basin, Slovenia, Based On Geophysical Research. Physics and Chemistry of the Earth, Parts A/B/C. (!) .