To what extent, the simple, conventional Leverett J-Function can be used as drainage-type capillary pressure model in order to correlate the capillary pressure and relative permeability - in the transition zones of carbonate reservoirs?
Background:
For water-wet reservoirs, we can straight-away use the Leverett J-Function as the drainage-type capillary-pressure model.
However, for mixed-wet reservoirs, say, for example, in carbonate reservoirs, in the transition zone, it will be more water-wet @ OWC (where the initial oil saturation equals the residual oil saturation), while it will be oil-wet in the vertically upward direction, where we have the irreducible water saturation level.
It is also known that the dynamic behaviors of transition zones associated with a carbonate reservoir can be well understood using the relatively complex Skjaeveland model and Masalmeh model that includes hysteresis.
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