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{\rm FZI} = \frac{1}{\sqrt{F_S} \, S_{gV} \, \tau } |
where
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body | --uriencoded--S_%7BgV%7D = \Sigma_e/V_\phi |
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| surface pore area per unit pore volume | | pore surface area |
| pore shape factor | | pore volume |
| pore channel tortuosity |
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In some practical cases this can be further simplified to:
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{\rm FZI} =\approx 0.0037 \cdot \frac{d}{\tau } |
where
One of the proposed qualification of reservoir quality based on FZI is given by the Table 1.
Table1. One of the grade systems on reservoir quality based on FZI.
FZI Value | Reservoir Quality |
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FZI > 8.0 | Very Good |
3.5 < FZI ≤ 8.0 | Good |
1.0 < FZI ≤ 3.5 | Medium |
0.45 < FZI ≤ 1.0 | Poor |
FZI ≤ 0.45 | Very Poor |
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics
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