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@wikipedia
The difference between phase pressures due to difference in fluids interaction with rock matrix:
Capillary pressure is a function of saturation, permeability and wettability.
One of the strong assumptions in reservoir fluid dynamic modelling is that 3-phase capillary pressure is a function of one saturation only:
(3) |
p_{cog} = p_{cog}(s_o) |
| a function of oil saturation only
s_o
|
(4) |
p_{cow} = p_{cow}(s_w) |
| a function of water saturation only
s_w
|