Heat flow variation with depth in Poland: evidence from equilibrium temperature logs in 2.9-km-deep well Torun-1 |
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| Authors: | Jacek?Majorowicz Jan??afanda Torun- Working Group |
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| Affiliation: | (1) Northern Geothermal, Edmonton, Canada;(2) University of North Dakota, Grand Forks, USA;(3) Geophysical Institute, Czech Academy of Sciences, Prague, Czech Republic |
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| Abstract: | High-precision temperature measurements were carried out up to a depth of 2,930 m in the 5.5-km-deep well Torun-1, 26 years after completion of drilling. The temperature log provides equilibrium thermal state information for the Polish Lowland at the western margin of the Precambrian craton. Geothermal gradient calculated from the equilibrium temperature log, together with estimates of thermal conductivity from ‘net rock’ geophysical well logging analysis and available core measurements, yields heat flow in the range 50–60 mW/m2 below 2-km depth. Heat flow of 50 mW/m2 plus ∼10 mW/m2 generated within thick sediments and highly metamorphosed sedimentary wedge is typical for the western margin of the Precambrian East European craton. Heat-flow variations with depth can be explained by a model of surface-temperature changes >10°C (glaciation to Holocene). Torun-1 Working Group: Marta Wróblewska, Jacek Majorowicz, Jan Szewczyk, Jan Šafanda, Vladimír Cermák |
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| Keywords: | Equilibrium deep temperature logs Heat flow variation with depth Glacial signature in subsurface temperature Northwestern Poland |
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