Experience of Using Sequence Stratigraphic Approach for Detailed Study of Upper Devonian-Tournaisian Clinoform Complex of Aktanysh-Chishminsky Trough

A study of the structure of the carbonate Upper Devonian-Tournaisian clinoform complex of the Aktanysh-Chishminsky branch of the Kama-Kinel trough system was conducted using sequence stratigraphy approaches. The study used 2D and 3D seismic data, analysis of log curves and core material. The stages of formation of regional and subregional seals, as well as terrigenous and carbonate-terrigenous strata were interconnected. The stages of high standing of the relative sea level were revealed, when a steep marginal ledge was formed, controlling low-amplitude linear uplifts. It was concluded that the greatest prospects for oil and gas potential are associated with the Lower Tournaisian clinoform complex, which contains the highest quality reservoirs. Potential objects for the search for non-anticlinal hydrocarbons are considered – lenses of detrital limestones confined to the foot of the Lower Tournaisian accumulative slope.