Types of Organic Matter and Generation Potential of Kungurian Terrigenous Deposits of Preduralsky Fore Deep

Different generation capabilities of Permian coalbearing deposits are determined primarily by presence of multicomponent organic matter in rocks and its catagenic maturity. Significant reduction of hydrocarbon potential is due to the wide distribution of IV type organic matter. Conducted researches are aimed at establishing the qualitative composition of organic matter, its potential estimation and areal distribution of selected types. The paper presents results of coal petrographic and pyrolytic studies of Kungurian deposits in the northern part of Preduralsky Fore Deep. The average composition of organic matter is characterized, connection between microcomponent composition of original organic matter and sedimentation conditions are shown, and primary spread areas of II, III, IV type organic matter are identified. Pyrolytic indicators arc evaluated and distribution areas of rocks with different hydrocarbon potential are detected. Rocks with low hydrocarbon potential are widely spread, hydrocarbon potential increases only locally, within eastern end of Khoreyversky depression, Chernyshev ridge, southern Varandey-Adzvinsky structural zone and north-eastern Kos'yu-Rogovsky depression. Terrigenous deposits of Kungurian age have low oil and gas producing properties in most parts of area being studied and are not capable to generate hydrocarbons in industrial scale.