Permanent geological and hydrodynamic models allow solving the problem of increasing the efficiency of field development. The quality and reliability of the geological basis directly depends on the lithofacies component with the integration of sedimentological factors, which makes it possible to assess the level of knowledge of the object and is the basis for planning geological exploration at all stages, including additional exploration. The purpose of this work is to identify promising zones U2 deposits of the eastern slope of the Surgut arch based on the reconstruction of the facies environment of sedimentation. The main prospects are associated with the upper part of the Tyumen formation – the U2 and U3 layers. Despite the large amount of accumulated data on formation rocks, the degree of deposits study is still insufficient due to the complexity of the geological structure, unevenness of the deposits and the lack of clear predictive criteria for identify zones of industrial productivity against the backdrop of conflicting test results and technological problems of stripping and development. The identification and zoning of reservoirs with increased properties is fraught with difficulties due to the peculiarities of the formation of sediments in continental and coastal-marine sedimentation environments. The composition and the structure of sedimentary system of different ranks were studied, the mechanism and conditions for their formation were determined, followed by an analysis of post-sedimentary changes in rocks, which made it possible to predict the spatial distribution of sedimentary bodies with different reservoir properties with varying degree of detail. When reconstructing sedimentation settings, a wide range of features was taken into account: the mineral composition of rocks, textural and structural features, the nature of the boundaries between lithological units, the mineral neoformation, faunal and floristic remains. The paper presents the lithological and facies characteristics of the deposits of the studied reservoir, establishes the patterns of the distribution of the distinguished facies-lithological types of rocks along the section and area, establishes promising zones for the development of the best reservoirs of the studied reservoir.
