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The Upper Devonian shales are predominantly carbonate, carbonate-siliceous thin-layer rocks with a high content of organic matter. Considered formation is widespread within the Volga-Ural and Timan-Pechora basins in the European part of Russia. Various estimations show that the hydrocarbon resources of the Upper Devonian shales range between hundreds of millions to billions of tons of oil. However, recovery of such hydrocarbons is significantly constrained due to the high heterogeneity and complex structure of roc...