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Biogenic origin of the carbonate reef build-ups poses multiple questions associated with spatial porosity distribution in corresponding hydrocarbon reservoirs. Consequently, this paper focuses on 3D characterization of the voids observed within chosen carbonate samples. Not only the pore type and geometry are interpreted, but also the origin of pores is attempted to be resolved. Zechstein (Permian) biogenic reef carbonates were examined. The rocks have been withdrawn from the central part of the isolated Wielichow...