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Later on it's been upgraded to percolation through inter-grain porous space which specifies the Flow Zone Indicator 

LaTeX Math Inline
bodyFZI
 as a function of grains shape, size distribution and packing.

The most popular correlation with mean grain size 

LaTeX Math Inline
bodyD_g
is given as:

LaTeX Math Block
anchorFXZ4L
alignmentleft
FZI = a \cdot D_g

where coefficient 

LaTeX Math Inline
bodya
 is a function of grain shape and packing.


See also

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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Petrophysics / Absolute permeability / Absolute permeability @model

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