Выпуск: 3-4 , Том: 58 , Год издания: 2017

Based on results of comprehensive lithological and geochemical analysis, we have established the regularities of the spatial distribution of major rock-forming components of the Bazhenov Formation in the West Siberian Basin (WSB), namely, siliceous, argillaceous, and carbonate material. According to the SiO2/Al2O3 ratio, the most siliceous rocks of the Bazhenov Formation are biomorphic siliceous mudstones (radiolarites) (> 20), cryptocrystalline siliceous mudstones (8-20), and the most argillaceous rocks are argillaceous mudstones (< 3). Intermediate SiO2/Al2O3 values (3-8) are observed in mudstones of different types. North-south distribution profiles of the SiO2/Al2O3 ratio and CaO content in different areas of the WSB were constructed. The areas of occurrence of radiolarites (potential reservoirs) and a "coccolith" member with the highest content of organic matter have been clarified. The thickest radiolarite bed (3-4 m) has been found in the Salym area. In some sections of the North Surgut area, a "coccolith" member is 2 m thick and is carbonatized. In most of the sections of the North Surgut, South Tomsk, and West Tomsk regions, rocks of this type are observed as 1 cm thick intercalates, and in the Novosibirsk region they are virtually lacking.