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 |
|---|
| LaTeX Math Block |
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| E_S = \frac{V_{sweep}}{V_\phi} |
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| LaTeX Math Block |
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| E_{SA} = \frac{A_{sweep}}{A_\phi} |
|
| LaTeX Math Block |
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| E_{SV} = \frac{h_{sweep}}{h_\phi} |
| – sweep volume – pore volume | | – sweep thickness – pore thickness |
The total sweep efficiency is a product of areal and vertical sweep efficiencies:
| LaTeX Math Block |
|---|
| E_S = E_{SV} \, E_{SA} |
| 