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PERMEABILITY-POROSITY RELATIONSHIPS 151
10000
1000
100
10
1
Figure 3.36. Relationshzp between vertical permeability measured on core samples
and vertical permeability predicted by Equation 3.97 [44].
1 0000
?
1000
Y
100
I0
1
1 10 100
Group d,, (k,,/$)"*
Figure 3.37. Relationship between vertical permeability and the product of average
grain diameter and mean bydraulic diameter in lower Devonian sandstone from
Illizi Basin, Algeria.
The curve fit between these two parameters is as follows:
kv = 13.336 (..E) (3.98)
1.333
The Coates and Denoo model takes into account porosity and irreducible
water saturation in the estimation of horizontal permeability [30]. Their
correlation for estimating horizontal permeability from porosity and
