Hot granites of southwest western Lithuania: new geothermal prospects

• Autorzy: Sliaupa S. , Motuza G. , Korabliova L. , Motuza V. , Zaludiene G.
• Języki publikacji: EN

Abstrakty

EN

The geothermal strategy of Lithuania is focussed on the utilisation of the sedimentary geothermal aquifers. The “hot” cratonic granites are proposed as a hot dry rock (HDR) or Enhanced Geothermal System (EGS) alternative. The largest (30*45 km) Zemaiciu Naumiestis Middle Proterozoic cratonic granitoid intrusion (ZNI) hosted by the Palaeoproterozoic granulites of the crystalline basement, overlain by 2 km thick platform sediments, is suggested as the most prospective object. The cratonic granitoids are characterised by anomalous heat production ranging from 4 to 19 &muW/m3 that associates with maximum heat flow of 80-100 mW/m2 which is the highest value measured in the East European Craton. The modelling of the potential fields together with geothermal calculations indicate that the thickness of the intrusion is of about 4 km (bottom depth of 6 km). The temperature at the top of the ZNI is around 95^oC that is not enough for utilisation of the HDR system. The isotherm of 150^oC is predicted at the depth of 3.5-4 km. The structural features of the ZNI granitoids indicate someplace highly prospective fabrics, such as low angle intense fracturing and moderate foliation that can be utilised as the enhanced natural confined reservoir.

Słowa kluczowe

EN

hot dry rock; Enhanced Geothermal System (EGS); Middle Proterozoic; cratonic intrusion; Lithuania

PL

hot dry rock; gorące granity; geotermia; środkowy proterozoik; intruzja kratoniczna; Litwa

• Wydawca: Instytut Gospodarki Surowcami Mineralnymi i Energią PAN
• Czasopismo: Technika Poszukiwań Geologicznych
• Rocznik: 2005
• Tom: R. 44, nr 3
• Strony: 26--34
• Opis fizyczny: Bibliogr. 33 poz., rys.

Twórcy

autor

Sliaupa S.

• Institute of Geology and Geography, T.Sevcenkos-13, 03223, Vilnius, Lithuania
• Geological Survey of Lithuania, Konarsko 35, 2600 Vilnius, Lithuania

autor

Motuza G.

• Vilnius University, Geology and Mineralogy Department, MK. Ciurlionio 21/27, 03101 Vilnius, Lithuania

autor

Korabliova L.

• Geological Survey of Lithuania, Konarsko 35, 2600 Vilnius, Lithuania

autor

Motuza V.

• Institute of Geology and Geography, T.Sevcenkos-13, 03223, Vilnius, Lithuania

autor

Zaludiene G.

• Institute of Geology and Geography, T.Sevcenkos-13, 03223, Vilnius, Lithuania

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