Evolution of Hydrocarbon Systems in the Tersk-Caspian Trough

The article analyzes the evolution of hydrocarbon systems in the Tersk-Caspian trough. In general, the modeling results confirmed the existing distribution of oil and gas content across the sedimentary cover of the region. Thus, according to modeling data, confirmed hydrocarbon deposits are located in reservoirs of upper Cretaceous chemogenic limestones in the areas: Andreevsk, Starogroznensk, Khayan-Kort, Pravoberezhsk, etc. The degree of reservoir saturation, excluding field development, is high – up to 80-90%. Subsalt bundles of the upper Jurassic may become promising objects for searching for hydrocarbons. According to the results of geological and geochemical modeling, there are significant volumes of hydrocarbons in the advanced anticline folds in the upper Jurassic subsalt deposits. The oil saturation here can reach 80% or more