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Summary Currently the proportion of Achimov deposits put into production in the north of Western Siberia has increased. Such projects require a flexible approach to realization of the production strategy and the ability to make adjustments to it quickly and efficiently. A similar approach was implemented on the BU21-3-1 formation of the Vostochno-Messoyakhskoye field, during drilling which the model was updated and improved in real time, new forecasts and recommendations were issued, when unforeseen formation features arised. In consequence of a comprehensive analysis of existing and newly obtained seismic, petrophysical and geological information obtained during the drilling of exploration and production wells, it was possible to collect integral view of the deposits, to refine and detail the geological model of the BU21-3-1 formation. Taking into account possible outcomes, a detailed program was worked out to reduce geological uncertainties, such as the presence of water-gas-oil contacts, a structural factor, the distribution of facies, their thickness, and reservoir poroperm properties. The implemented methodology allows to predict the distribution of the reservoir and oil-saturated thicknesses, in the case of low predictive ability of seismic attributes, only in case that the source of data are of good quality (3D seismic surveys, inversion cubes, borehole seismic), as well as the correlation of elastic properties in drilled wells and cubes. |
