The zoning and characterisation of heterogeneous carbonate reservoirs based on the concept of flow units

ABSTRACT Petrophysical evaluation of a formation using petrophysical logs and core data plays an important role in determining the quality of the formation and the quantitative and qualitative characteristics of the reservoir. By zoning the reservoir layers, the focus is more effectively on areas with higher potential for hydrocarbon production. This research was conducted to interpret petrophysical data to identify reservoir zoning in one of Iran's oil reservoirs. The petrophysical core data and well logging charts were integrated and adapted for the reservoir zone. For the vertical samples, four flow units were identified and the formation was divided into four reservoir zones, with most of the samples taken from the second and third zones. Six hydraulic flow units were identified for horizontal samples. In the second and third zones, the samples were closely spaced and had the petrophysical properties that are similar, but superior, to those of the other zones.