The paper presents the void space configuration and geometry models for the Lower Devonian and Upper Silurian reservoirs of R.Trebs oil field. The productive formations are characterized by heterogeneity and complex architecture of the pore space which includes practically all types of voids – primary and secondary or epigenetic pores, fractures and solution vugs developed along fractures. The study reviews small to large scale methods for analysis of vug component as a fraction of the void volume in the reservoirs – laboratory (thin sections, conventional core plugs and whole or full-diameter core samples), rock physics (sonic waveform logging, nuclear magnetic resonance, imagers) and production logs (flow profile, productivity). The results are used to develop simplified models for reservoir characterization of the pore space architecture for the Lower Devonian and Upper Silurian productive formations and also to identify trends in well productivity as a function or rock physics properties of the reservoirs.

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