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Because of the hydrocarbon reserves reducing from traditional reservoirs in Russia, much attention is paid now to unconventional resources, such as the Domanik oil shales of the Volga?Ural Basin. The Domanik deposits consist of siliceous-clay-carbonate rocks enriched with organic matter and other components of oil in the dispersed state. They are Middle Frasnian source rocks and have low porosity and permeability. Domanik shales contains many oil occurrences and rare fields, which is primarily explained by the abs...