Litho-Facial Reconstructions of the Upper Jurassic Deposits in the Central and Southern Parts of the W. Siberia Basin

Potentially productive Upper Jurassic (Oxfordian) deposits widely distributed in the eastern part of the Khanty-Mansi Autonomous Okrug and the north-eastern part of the south Tyumen region have been investigated using multidisciplinary approach, which allows recognition of structural feathers of reservoirs and reconstruction of sedimentary basin evolution. On the basis of detailed setimenthological core description, interpretation of LOGs and complex analyses of obtained laboratory results 7 characteristic facies have been determined: channels, proximal and distal deltaic fans, barriers, coastal plain, offshore and shelf. Then litho-facial map of the Oxfordian was constructed in coordination with 2D and 3D seismic data. Channels, proximal deltaic fans and barriers facies distributed in the eastern and western parts of the Khanty-Mansi Autonomous Okrug and the north-eastern and central parts of the south Tumen region are considered to be most perspective for hydrocarbon sources.