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A significant part of the light oil reserves in Russia is concentrated in low-permeable reservoirs, such as the Domanik Formation, Upper Devonian shales in the European part of Russia. Standard laboratory methods for estimating pore space structure and fluid saturation are often not applicable or not accurate in studying unconventional rocks. The presence of hydrocarbons with a high content of highly viscous components, including kerogen, and pores of nanometer size dramatically reduces the effectiveness of the co...