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A part of the reservoir pore volume subjected to displacement by invaded fluid (aquifer, injected water, injected gas or injected chemicals):

Total sweep

Areal sweep

Vertical sweep

E_S = \frac{V_{sweep}}{V_\phi}

E_{SA} = \frac{A_{sweep}}{A_\phi}

E_{SV} = \frac{h_{sweep}}{h_\phi}

– sweep volume

– pore volume

– sweep area

– pore area

– sweep thickness

– pore thickness

The total sweep efficiency is a product of areal and vertical sweep efficiencies:

E_S = E_{SV} \, E_{SA}