Page 180 - Basic Well Log Analysis for Geologist

LOG INTERPRETATION CASE STUDIES

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Effect of grain size

100
390}-—-

80r—-

TOK

60r-

SW % 50F-

40--

30r-
- Figure 73.
20

iOh- Grain size determination by water saturation (S,,)
L. versus porosity (@) crossplot, Mississippian Mission
bait
Jot
o anyon Formation. Williston basin.
\
3 4 5 6 78910 (50280 Cuny
$ %

Krw
100

90h

SW % Figure 74.
Irreducible water saturation (S,, ;,.,) versus water saturation (S,,)
crossplot for determining relative permeability to water (K,,).
Mississippian Mission Canyon Formation, Williston basin.
Swirr = \VF/2000 This formula calculates an approximate, theoretical
value for Sy iq. Values calculated for Sy ;,, by this formula should only be
used in crossplots where you are trying to determine Ky. Kr. Kays OF
percentage water-cut.

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