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EN
The paper sites the facts of genetic connections of layer overpressure in natural basins to the process of fold-forming based on examples of oil-bearing West-Ukrainian basin. The given data, from the authors' point of view, confirm the correctness (equity) of tectonic conception of overpressure layer forming in certain geological settings, that is in regions with younger folding. The authors do not consider Hottman and Johnson (1965) and other scientists' consolidation (compression) theory to be universal for the explanation of the reasons of overpressure forming. Tectonic factor is the dominating factor of overpressure layer forming in folded regions. The paper focuses here on the secondary migration of fluids occurring in sedimentary rocks and also stimulation of overpressure forming in the layers in the crests of the folds. At this process а portion of fluids is squeezed into permeable layers, where their density decreases, and zones of invasion occur above the layers with overpressure.
EN
This article explains tlie method of defining oil and gas bearing stratum after the clay swelling coefficient. When the value of clay swelling coefficient is low oil and gas saturation of rock is foreseen. This method is based on selecting bore core samples while boring and constructing litologic profile using the core samples selected while boring. The method doesn't require additional substantial funds so it can be considered as economically effective.
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