The results of the investigations suggest that most of the local uplifts in the Bazhenovka Formation, in particular, the Larlomkiny structure bearing an Upper Jurassic oil pool, formed in the Neocomian due to the inherited growth of erosional-tectonic salients (ETS) of the pre-Jurassic basement, and then developed only slightly. The large tectonic structures of the first order¡ªthe Kaimysovy arch and the Yugan megadepression and the Pervomaiskoe¨CVesennii swell¡ªa big trap associated with one of the largest oil fields of southeastern West Siberia, completed their formation in the Cenozoic.
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