3D geological modeling Achimov sequence sediments under conditions of significant changes of oil-water contact

Abstract

For the productive formation of Achimov sequence texture features have been studied, which have a significant impact on the oil saturation of reservoir rocks depending on the changes of height above oil-water contact. It is noted that if the height of the interlayer above the surface of oil-water contact decreases, the boundary value of the permeability for the oil saturation of interlayers increases. The obtained conclusion can be used to justify the reduction of oil saturated thicknesses in the intervals close to the oil-water contact or to determine the oil sa-turated thicknesses of layered reservoirs. The result of this work is a digital three-dimensional geological model of the Ach6 reservoir at the Imilorskoye oil field. This geological model includes not only a detailed lithology differentiation of the section, taking into account the noncollector rocks, but also a model of oil saturation, built on changing under the influence of the height of the reservoir over the oil-water contact conditioned values of permeability of reservoir rocks responsible for their "spotty" saturation. The proposed approach makes it possible to achieve the current water cut for this reservoir of 55 % without adjusting the relative phase permeability at the actual well data on average 56 %.