Geochemistry of Oils and Organic Matter in Source Rocks in the North of the Volga–Ural Oil and Gas Province

This paper presents results of geochemical studies of source-rock, reservoir-rock, and oil samples from oilfields in the Udmurt Republic. The molecular and isotopic composition of the oils and bitumens shows their strong genetic relations to a single source of liquid hydrocarbons: the Domanik (Semiluki) source rocks (of Late Devonian to Early Tournaisian age, D3f2). At the same time, features of the molecular and isotopic composition of the hydrocarbons suggest the participation of several interrelated kitchens of same genetic type for the different parts of this territory. This information will be useful for verifying basin modeling results and planning geological explorations at the territory.