Page 283 - Petrophysics 2E

256 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

Thus, from Equation 4.100, the values of Hsh and flow zone indicator
FZI,h are:

(4.112)

(4.113)

This plot should result in the segregation of flow units represented by
distinct clusters. If the Timur permeability model is used, Hsh and FZI,h
become:

Hsh = 0.5m f 1.7 (4.114)

Fash = 29.09F (4.115)
aRW

If a different permeability-porosity equation, but one of the same general
form as Equation 4.109, is more appropriate for a specitic formation,
then simply substitute the appropriate correlation constants C1 and C2
in Equation 4.110.
In some field cases it was found that the scatter in the log-log plot of
RQI versus porosity was reduced by introducing the shale fraction term
Vsh into RQI as follows:

(4.116)

In this case Equation 4.110 becomes:

(4.117)

Equations 4.1 13 and 4.1 15 become:

(4.1 18)

(4.1 19)