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 |
|---|
| (1) |
E_S = \frac{V_{sweep}}{V_\phi} |
|
| (2) |
E_{SA} = \frac{A_{sweep}}{A_\phi} |
|
| (3) |
E_{SV} = \frac{h_{sweep}}{h_\phi} |
|
V_{sweep} – sweep volume
V_\phi – pore volume |
A_{sweep} – sweep area
A_\phi – pore area |
h_{sweep} – sweep thickness
h_\phi – pore thickness |
The total sweep efficiency is a product of areal and vertical sweep efficiencies:
| (4) |
E_S = E_{SV} \, E_{SA} |
