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[References: 7 tit.]

In the paper briefly explained reservoir connectivity evaluation and reservoir flow connectivity definition coefficient is given. Reservoir heterogeneity of the Tomsk area oilfields was examined. Connectivity coefficient values for geomodels and corresponding simulational models were evaluated and related to sedimentation environments of the reservois. It was found, that marine reservoirs show better connectivity having the same net to gross ratio as other facies. Continental and deepwater facies connectivity is worst and deltaic facies are in the intermediate position. Relation between net to gross ratio and connectivity shows that reservoir flow performance can be estimated from NTG with relatively high error (20–30%). There was no relation between permeability and connectivity found. Moreover, detailed study of geomodel, simulational model connectivity can point out to incorrect selection of the reservoir modelling method.