Abstract
The temperature profile of the KTB pilot drillhole, T( z) KTB-PH,is distinctly nonlinear: a temperature deficit ΔT (relative to a linear temperature-depth profile) is especially pronounced in the depth range 500–3500 m. The depth dependence of the deficit, Δ( z) is compared to be anticipated effect of surface paleoclimatic variations, ΔT pc( z), at the drillsite on the temperature profile. The latter can be calculated from available paleo-climatic models. If ΔT pc( z) is added to T( z) KTB-PH, a nearly linear temperature-depth curve results with an average geothermal gradient of 27.9°C/km. This, together with an average vertical thermal conductivity of 3.0 W/mK, estimated from KTB drillcore data, implies a heat flow density at the KTB site of 84 mW/m 2. This modelled value is in good agreement with heat flow determinations in the adjacent Eger graben structure (Western Bohemian massif).
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