Improved Characterisation and Modelling of Carbonate Reservoirs for Predicting Waterflood Performance

Carbonate reservoirs are highly heterogeneous and often show<br>oil-wet or mixed-wet characteristics. Both geological<br>heterogeneity and wettability have strong impact on capillary<br>pressure (Pc) and relative permeability (Kr) behaviour, which<br>is controlled by the pore size distribution, interfacial tension<br>and interactions between rock and fluids as well as the<br>saturation history. Capillary pressure data are essential input in<br>both static and dynamic modelling of heterogeneous carbonate<br>reservoirs. Drainage Pc is generally used for initialising<br>reservoir static models while imbibition Pc is used to model<br>secondary and tertiary recovery processes.