D03 WATERFLOOD EFFICIENCY FOR DIFFERENT PORE CLASSES IN CARBONATE RESERVOIRS 1 Abstract Carbonate reservoirs are usually very heterogeneous and contain a wide range of different pore classes. The main pore classes are primary and secondary interparticle pores mouldic pores intercrystalline pores and also chalk and chalky microporosity. In this paper we have studied limestone cores with intercrystalline macroporosity patchy intercrystalline mesoporosity and dolomite cores with mouldic micropores Single phase dispersion was measured by injecting a slug of water tracer. The dispersion characteristics can give information about the amount of dead-end pores inaccessible pore volume and hydraulic mixing due to the


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