One of the measures of rock quality in terms of availability for flow:
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{ \rm FZI } = \frac{\rm RQI}{\phi_z} |
where
Unit = μm
It has much weaker dependence on effective porosity and shaliness and can be often considered constant within a given lithofacies which makes it a very efficient tool for lithofacies analysis
The constant FZI means that permeability strictly follows Cozeny-Karman permeability @model, although it's rarely met in practise.
The FZI depends on grains size distribution, shape and packing .The most popular correlation with a mean grain size
is given asand can be modelled as follows:
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| anchor | FXZ4LFZI |
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{\rm FZI} = a\frac{1}{\sqrt{F_S} \cdot, D_gS_{gV} \, \tau } |
where coefficient
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In some practical cases this can be further simplified to:
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{\rm FZI} = 0.0037 \cdot \frac{d}{\tau } |
where
See also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics
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