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Vast majority of oil and gas deposits are associated with zones of regional attenuation of vendian terrigenous complex in Leno-Tungussian province. Decreasing of thickness of terrigenous complex is associating with isochronous depositional break that determines of stratigraphical contact with basement. As a result of analysis of structural and thickness maps there was constructed a scheme of localization of non-structural traps within Kaangian upfold and Baikit anteclise