| Title | Geothermal Potential of Hot Granites of Lithuania |
|---|---|
| Authors | Saulius Sliaupa, Gediminas Motuza, Larisa Korabliova, Kristina Ciuraite, Vytautas Puronas |
| Year | 2010 |
| Conference | World Geothermal Congress |
| Keywords | Hot Dry Rock, Lithuania, geothermal potential |
| Abstract | The Middle Proterozoic cratonic granitoid intrusions hosted by Lower Proterozoic high-grade metamorphic and igneous rocks are considered to have the highest geothermal potential in Lithuania, essentially in the southwest. They show the increased heat flow that correlates with the high heat production of those cratonic granitoids. These rocks are still difficult to explore due to great depth of the basement overlain by up to of 2 km thick sedimentary cover. Still, abundant deep industrial wells and potential field data in combination to available geothermal information enables preliminary assess these intrusions. The most prospective body is the largest Zemaiciu Naumiestis intrusion (ZNI) identified in southwest Lithuania at the depth of about 2 km. It is characterized by maximum heat flow due to anomalous heat production that results in elevated temperatures. According to sensitivity and modelling results temperature within ZNI ranges from 90 to 250°C. The predicted depth of the isotherm 150°C is in the range of 4.5-5.0 km (2 km drilling through the sedimentary cover and 2 km drilling of the crystalline basement). The isotherm 200°C is predicted at the depth of 6.0-6.5 km. |