Abstract
Thermal borehole logging of the eastern part of the West-Siberian lowlands shows a dependable correspondence between geologic features and thermal gradients. After comparing logging data from various depths up to 2,900 m the author concludes that major basement structures and all except the deepest ground water horizons will be revealed in logging data taken from relatively shallow boreholes, such as those drilled for surveying and stratigraphic purposes. This discovery prompts the author to recommend that thermal logging be conducted in such boreholes as a very cheap method of determining deep structures, especially since they lead to important oil and gas- discoveries. — A. Eustus
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