The article presents the projected results of the offshore development option in the zone of deteriorated filtration-capacitance properties. To involve additional oil reserves in the development, it is proposed to use multi-stage hydraulic fracturing technology at the projected horizontal wells. The analysis was executed using modern methods of geological, hydrodynamic and geomechanical modeling. Method of most favorable zones’ isolation for carrying out multi-stage hydraulic fracturing of formation based on maps of permeability, current formation pressure, density of residual movable oil reserves and cover power is proposed. Taking into account the selected zones and the expected direction of crack development, the trajectories of new horizontal wells with a large deviation from the vertical were optimized. Efficiency assessment was carried out by comparing the technical and economic parameters of the proposed development option (horizontal wells with multi-stage hydraulic fracturing of the formation) with the basic version (horizontal wells with traditional completion). A hydrodynamic model was used to calculate oil production levels according to options. As a result, it was proved that the use of multi-stage hydraulic fracturing technology will involve additional oil reserves in the development and increase the efficiency of expensive offshore drilling.

Development of greenfield-type fields with a gas cap and oil rims on the shelf of Sakhalin Island is always associated with a high level of geological and technological risks. To assess the investment attractiveness of the projects, it is necessary to provide an in-depth elaboration of the concept, considering many uncertainties of both the geological structure and the development strategy and the subsea construction scenarios. A modern approach to risk assessment involves the mathematical modelling arrangement of the entire chain of technological processes from the interpretation of seismic data to the calculation of the material balance of the installations for the preparation of produced products. Integrated modelling at the current stage of technological development allows exploring many combinations of uncertainties in terms of the impact on the final hydrocarbon production profile and, accordingly, the economic indicators of the project. Possibilities of integrated modeling today are not limited to conceptual field design development. The result was the creation of an effective production planning tool for one of the most promising offshore fields of Sakhalin Island.

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