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In the paper, the deep borehole Sosnowiec IG 1 testing for geothermal reasons is proposed. The Devonian - Carboniferous megacomplex of carbonate rocks at the depth interval between 1690 - 3144 m was drilled and the temperature ot 98°C in the deepest part was ascertained. This megacomplex is thought to be perspective for geothermy because of temperature and collector properties that would be also improved...
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