Abstract
The Verkhnesalat oil field is confined to the Middle Vasyugan megaswell located in the southeastern part of the West Siberian Plate. Callovian‐Oxfordian rocks of this region are productive. The purpose of our study is to refine the geological structure of the Verkhnesalat oil field, in particular, to elaborate indexation of sand beds‐reservoirs. The necessity of such investigations stems from the following fact. Although the oil field was discovered in 1967, there is no agreement regarding the indexation of productive beds so far. At the same time, localization of the industrial object in well sections and its extension over the area should be established for putting the oilfield into operation. This study was based on geological‐geophysical materials (GIS data, results of core examination and description, assessment of capacitance‐filtration properties of rocks, and others) related to wells 21, 30, 31, 33, as well as comprehensive lithological‐petrographic study of the Well 28 section. Quantitative characteristics of grain size distribution, mineralogy, cement, pore space, and secondary processes in 42 thin sections were established based on the method suggested in [3]. Thin sections were prepared from samples preliminarily impregnated with resin under pressure. The Vasyugan Formation, which hosts the majority of petroliferous fields in the southeastern West Siberian Plate, is subdivided into the lower (clayey) and upper (silty‐sandy) units. In elevated areas (in particular, the Verkhnesalat local structure), lower parts of the Lower Vasyugan Subformation are enriched in sand. This fact was established by geologists of the Western Petroleum Exploration Expedition in 1991 who assigned index to productive beds at the base of the Lower Vasyugan J1 Subformation in wells 30 (interval 2490.0‐2503.0 m), 31 (2475.0‐2485.6 m), and 21 (2480.0‐2491.0 m). At the same time, Bed also included a sandy interlayer separated from the main bed by a clayey or clayey‐silty layer 2.4‐3.0 m thick. The author of the present communication believes that the interlayer should be
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