The article presents the results of studying the fracturing of the Osinsky productive horizon on the example of hydrocarbon deposits based in the central part of the Nepa arch of Nepa-Botuoba anteclise of Eastern Siberia. The identification of additional factors affecting the reservoir properties of productive horizons and the inclusion of the data obtained into geological and hydrodynamic models is an urgent scientific and technical task taking into account the complex geological structure of carbonate reservoirs. The formation of the O1 layer of the Osinsky horizon in the arched part of the Nepa-Botuoba anteclise in an area with developed fault-block tectonics caused the widespread development of fracturing, which until recently was little studied by field and laboratory geological and geophysical research methods. Based on a comprehensive analysis of well logs, core research results and well test data, the characteristic of the fractured component of the void space of the O-1 formation is given, and its role in the current state of development of carbonate reservoir deposits in Eastern Siberia is determined. During the work, new data was obtained on the presence of subvertical tectonic fractures in the section of the O-1 formation, characterized by the greatest disclosure and acting as additional highly permeable fluid filtration channels. In the near future, it is planned to conduct comprehensive lithological and petrographic studies in new wells, which will significantly clarify the parameters of fracture systems and obtain additional data to improve petrophysical algorithms for the purpose of differentiated calculation of reserves in both porous-cavernous and fractured formations, as well as clarify permeability coefficient of Osinsky horizon reservoirs in zones of tectonic fracturing development.
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