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Achimovsky deposits of the North of Western Siberia are characterized by variability of the reservoir on lateral and in vertical directions that leads to increased development risk. A main objective of the paper is definition of an optimal development scheme of pilot project sector and to use the received results in creation of the systematic plan of studying and drilling of other perspective areas for decrease in geological risks and for eduction of CAPEX on drilling. In this paper, creation of conceptual geological and hydrodynamic model of BU213 layer of the East Messoyakhsky field is described. Reservoir of achimovsky deposits is characterized by clinoform (lenticular) structure. An optimal development scheme is choosen by multivariant geological and simulation modeling. Number of wells, length of horizontal section, quantity of stages of multistage hydraulic fracturing, proppant volume were varied for choosing an optimal development scheme by multivariant geological and simulation modeling. The additional research of geomechanical parameters was performed; modeling of water-saturated BU212 layer is conducted to find reason of water-cut increasement on production wells, and obtained results were used to re-design fractures for the purposes of low-volume hydraulicfrac fracturing efficiency increasement. This approach allowed selecting an optimal development scheme – maximization of produced oil with minimization of drilling costs. Pattern of horizontal wells with multistage hydraulic fractures (5 stages) is recomended. For removal of geological uncertainties different development scenarios were provided which allow operative change a designed well pattern depending on drilling result, well tests and wells productivity. At each stage of obtaining information geological and simulation models, updates are planned. That allows specifying probabilistic forecast of liquid, oil and gas production. After obtaining of results, phased drilling plan was generated and studying plan of other object BU213 deposits is approved.