Page 179 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2

148 Reservoir Engineering

Deep Laterolog Borehole Correction
DE-DE Centered,Thick Beds
1.4
1.3
9 1.2
a
11.1
8
5 1.0
cr' 0.9
0.8
0.7
5 10 20 50 100 200 500 1000 5000 10,000
RLLD~

Shallow Laterolog Borehole Correction
DE-DE Centered, Thick Beds
1.5
1.4
3 1.3
5 1.2
E 1.1
Y
a 1.0
0.9
0.8
5 10 20 50 100 200 500 1000 5000 10,000
RLdR,

Figure 5-80b. Borehole correction charts for the dual laterolog [199].

If no porosity log or water zone is available, the ratio method can be used
to find water saturation. The saturation of the flushed zone (S,) can be fmd by:
s, =[?I w (5-98)

When Equation 5-70 is divided by Equation 5-98, the result is a ratio of
water saturations:

(5-99)