Heat flow variation with depth in Poland: evidence from equilibrium temperature logs in 2.9-km-deep well Torun-1
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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).
KeywordsEquilibrium deep temperature logs Heat flow variation with depth Glacial signature in subsurface temperature Northwestern Poland
We would like to thank both reviewers, Dr. Sukanta Roy and Dr. Stefan Bellani for their reviews. Tedious job done on our manuscript by Sukunta Roy is very appreciated. It helped us in shaping up final version of this paper. The measurements in well Torun-1 was done under Polish Ministry of Science Grant 4 T12B 004 29. Czech Academy of Science involvement was partly supported by the above grant and by the research project AV OZ 30120515 of the Geophysical Inst. of the Czech Academy of Sciences.
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