The depletion of the majority of mature fields with the best reservoir properties and the easiest extracted reserves determines the necessity of involvement in the elaboration structurally complex reservoirs of different kind.
Among them a special place occupy laminated sands, which can contain and produce oil and gas. However, ther is a number of problems associated with determination of their reservoir properties, reserves volume and effective development.
In this context PK formation of Russkoye field in Western Siberia is the classical example of such kind of objects (Pic. 1.). The main problem is that the shale microlayers are not resolvable on the logging curves, as their thickness is much less than the resolution of the main well logs. The logging methods characterize integral rock properties (sandstone and shale alternation). The usage of classical approach does not allow determine the real properties of sandstones, and net thickness estimated by conventional log evaluation is not real, as it contains impermeable shale microlayers.
So, the petrophysical model of homogeneous reservoir, made previously, does not correspond to the results of hydrodynamic modeling. There was no success in its adaptation without significant increase of permeability and oil and gas saturation.