Detailed correlation of Callovian and Upper Jurassic petroliferous deposits in the north of West Siberia

The Callovian and Upper Jurassic deposits of northern West Siberia promisin g for prospecting for oil and gas demonstrate a polyfacies composition. The correlation of these deposits, including producing beds, is still much dis putable, The article reports correlations of these beds at the level of zon al cyclites. A more reliable recognitiion of age analogs of the Bazhenov Fo rmation in Eastern type of sections is reported. The diachronous nature of the upper boundary of the Vasyugan Formation and the clinoform structure of the Upper Jurassic deposits are confirmed. It is shown that the Tochino Fo rmation and the Lower Sigovaya Subformation of the Turukhan-Elogui area are similar in composition and structure to the Lower and Upper Vasyugan Subfo rmations, respectively. The stratigraphic position, volumes, and areal occu rrences of main producing and promising sand beds J(1)(1)-J(1)(4) and SD1-S D4 are refined.