Displacement efficiency defines the fraction of the initial pore-saturating fluid displaced in a the piston sweep by invaded fluid
E_D = 1- \frac{V_{FLUID, \ INITITAL} - V_{FLUID, \ INVADED}}{V_{FLUID, \ INITITAL}}
Water-Oil Displacement Efficiency (EDow)
Gas-Oil Displacement Efficiency (EDog)
See also
Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics
[ Permeability ] [ Absolute permeability ] [ Relative permeability ] [Relative permeability @model ]