Page 185 - Petrophysics

158 PETROPHYSICS: RESERVOIR ROCK PROPERTIES

(b) Only horizontal permeability and porosity data are available
(porosity = 11 %).
(c) Horizontal permeability, porosity, and average grain diameter data
are available (grain diameter = 0.085 mm).

Repeat the above example assuming that the TAG1 formation contains a
high percentage of Illite clay.

SOLUTION

Equal Kaotinite-Illite Model
(a) Using Equation 3.104:
0.9707
kv = 0.598 kH
kv = 0.598(0.58)0.9707 = 0.35 mD

Anisotropy ratio, Equation 3.96:

0.58
kH
IA=---- - - 1.657
kv 0.35
(b) Using Equation 3.106:
kv = 0.0535 (E)
2.1675

2.1675
kv = 0.0535 (F) 0.35 mD
=
0.58
0.11
0.58
IA = - - -
-
kH
-
- 1.657
kv 0.35
(c) Using Equation 3.109:
kv = 7.7445 (dgr (E))
1.8009

1 .SO09
kv = 7.7445 (0.085 (E)) 0.4 mD
=

kH 0.58
IA = - = - 1.45
-
-
kv 0.4