Page 148 - Petrophysics
P. 148
PERMEABILITY-POROSITY RELATIONSHIPS 121
100
75
50
25
0
0 100 200 300 400 500 600 700
Specific Surface Area, m2/cm’
Figure 3.20. Water saturation as a function of suvace area (spv) in sandstone
formation [28].
parameters [27]. Dividing both sides of Equation 3.27 by porosity and
taking the square root of both sides yields:
(3.42)
If permeability is expressed in millidarcies and porosity as a fraction, the
left-hand side of Equation 3.33 becomes:
::
RQI=O.O314 - (3.43)
where RQI is expressed in micrometers or ym (1 ym = m).
(b) Flow zone indicator (FZI). The flow zone indicator is defined from
Equation 3.42 as:
1
FZI = (3.44)
SV@&
Thus Equation 3.42 can be written as:
RQI = FZI($,) (3.45)
where $2 is the ratio of pore volume to grain volume:
(3.46)
