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Carbonate rocks, bearifng the majority of world?s hydrocarbon reserves often exhibit variable lithology. In carbonates, different proportions of calcite and dolomite, accompanied by other minerals can be expected. Dolomitization of carbonate rocks usually leads to porosity enhancement, since dolomite crystals occupy smaller volume in comparison to calcite. This paper considers the integration of Alizarine Red S staining method and image analysis in order to qualitatively state the content of both calcite and dolom...

Both complicated dissolution processes and different patterns of fossilsпїЅ distribution may be expected in carbonate hydrocarbon reservoirs. Therefore, this paper aims to precisely locate such places using few independent analytical tools. Five carbonate samples from the Permian Bro?sko Reef (Western Poland) were studied in a form of both thin sections and cylindrical core samples. The latter were subjected to Computed Microtomography (?CT) and Nuclear Magnetic Resonance (NMR) experiments. While the ?CT helped to...

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 The rocks have been withdrawn from the central part of the isolated Wielichow...