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The subsurface temperature field of the northern Bohemian Basin (Cretaceous) was studied by using a group of 8 boreholes (depth 75-220 m) drilled in a hydrogeologically active area (2 horizontally layered aquifers separated by an aquiclude) with a pronounced relief (400 m within 2 km from the borehole sites). Reliable temperature logs from closely spaced holes allowed evaluation of both vertical...
In 1992, a 150-m-deep borehole was drilled in Ordovician shales in Prague. Drilling lasted 1 month and was interrupted by frequent stoppages. Temperature recovery after drilling was observed until equilibrium was reached. The maximum temperature disturbance in the upper part of the hole was 0.6°C 2 days after drilling and the temperature gradient was reduced to 14.1 mK m −1 at that time (17...
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