Structural features and conditions of Berriasian-Lower Aptian deposit formation in western regions of Yenisei-Khatanga petroleum area

Main hydrocarbon resources of the Yenisei-Khatanga Petroleum Area are associated with Lower Cretaceous deposits. The authors discuss the issues of stratigraphy, reservoir bed indexing, structural features and conditions of formation of clinoform sequence confined to the basal part of Lower Cretaceous deposits. Clinoform formation in the western part of the trough occurred in conditions close to those existing in Berriasian-Barremian time in most of the West Siberian sedimentary basin. However, a number of factors have caused the clinoform sequence of the Yenisei-Khatanga Petroleum Area to have special features. The mentioned factors are: low speed of clinoform sequence progradation, existence of several provenance areas, paleobathymetry and paleomorphology of the basin floor, enormous (up to 6 km) thickness of underlying Triassic-Jurassic formations, etc