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Substantiation of reservoirs in the Bazhenov Formation in the Malobalykskaya and neighboring areas (KhMAO, Western Siberia)

The article presents the results of a comprehensive interpretation of new results of laboratory studies of the core material of the Bazhenov formation and well logging data for three wells. A set of criteria for identifying reservoir intervals is substantiated, which includes the results of determining the chemical and mineral-component composition of rocks, the pyrolytic characteristics of the organic matter contained in them, as well as the petrophysical properties of these deposits. It has been established that the reservoirs can be silicites occurring in the middle part of the Bazhenov formation section - they have a high open porosity and the presence of mobile oil, confirmed by the inflow in one of the wells. It is shown that at a distance of 15-20 km this siliceous interval may not have reservoir properties, which is probably due to a different filling of the void space of these rocks. Carbonate and phosphorite rocks, which are also reservoirs in some fields in this region, do not contain mobile oil in the studied sections. It is substantiated that well logging data can only be used to identify possible productive intervals, the study of which by laboratory methods will make it possible to establish and forecast the presence or absence of reservoirs in them.