We consider the formation history of high-amplitude anticlinal trap structures for unique Cenomanian gas pools using the example of the Medvezh’e field. Analysis shows that the Turonian–Cenozoic was the most crucial stage of formation of the world’s largest gas-bearing province in northern West Siberia. This stage was marked by (1) the formation of large anticlinal traps—petroleum-promising objects; (2) the highest intensity of gas formation, which caused the filling of these traps; and (3) the formation of the Kuznetsov seal, which shields the giant Cenomanian gas pools.

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