Nowadays most of the mature oil fields are well developed. Drilling of the remaining areas by leftover principle has low success rate and leads to high amount of marginal wells. These risks are increased when drilling Vasyugan unit. Vasyugan unit sediments are characterized by significant lithological heterogeneity, both vertical and lateral. Formation U1-1 non-uniformity is associated with different stages of sediment generation and presence of cross bedding and lenticular lenses. This work presents alternative approach to geological model elaboration which is based on detailed seismic and geological data analysis aimed at minimization of risks while developing drilling strategies for areas with complex geological structure.......

The results of studying the effect of zeolites on the properties of reservoirs are present. The facies of zeolite-containing clastic rock are determined. The criteria for identifying zones of development of zeolites in the borehole by log-data are established. A petrophysical model for zeolite-containing sandstones has been developed.......

On the basis of facies analysis of U15-U14 formations within Urmanskoye and Archinskoye fields, the primary (sedimentation) background for reservoir properties and their differentiation along a section is established. According to the results of core and well logging studies, it has been determined that lithogenetic factors associated with tectonic processes exerted the major influence on the reservoir quality. The proposed model of reservoir properties evolution can be used as a basis for the forecast and search criteria for identifying zones with better reservoir quality in analogous sediments with a similar history of tectonic development.......

Based on the performed lithological-facies analysis of sediments, a model of sedimentation of the basal terrigenous complex of the Idjosh Sever oil field was created. A characteristic feature of the deposits is the polymictic composition and coarse-grained (psephitic) structure. The alluvial genesis of sediments is established, the history of the formation of Middle Miocene sediments is reconstructed, the geometry and architecture of the reservoir are characterized. The proposed model of deposition formation served as the basis for the construction of the 3D geological model and the establishment of drilling points for the subsequent both exploratory and production wells according to the constructed geological risk map.......

The article discusses issues related to justification of the conceptual model for the winding objects of the «cord» type, interpreted in seismic data as meandering channel systems. The problem is that the meandering river systems are diverse, and this fact must be taken into account to verify the resource assessment and reduce the risks of such objects drilling. The article provides practical examples: the first example illustrates the free meandering conceptual model; second - forced meandering. A comparative assessment of the resources for the model field in condition of free and forced meandering concept was made.......