Page 219 - Petrophysics 2E

192 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

Well No. 11 Well No. 8 Well No. 37 Well No.18

1906.5 1918.5 1922.5 1973
Zone 1
1975
Zone I1
1977

Zone 111

Average Thickness Average Permeability
(fi) (mD)

Zone I 2.1 33
Zone 11 5.0 189
Zone 111 7.5 36
Figure 3.60. Cross-section showingPna1 zonation [55].

The results of the zonation between wells, which are not given
here, define the existence of three continuous zones which have an
average thickness, from top to bottom, of 2.1, 5.0, and 7.5 ft, and an
average permeability of 33, 189, and 36 mD, respectively. Figure 3.60
is a cross-section showing the final zonation. The zonation technique
is general and can therefore be applied to reservoir properties other
than permeability, including porosity, formation resistivity factor, and
fluid saturation. The statistical zonation technique assumes a priori that
stratification exists within the reservoir. If the reservoir is not stratified,
however, the statistical zonation technique will show it.