Page 216 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2
P. 216
Formation Evaluation 185
10 20 30 40 50
(CUI
Example: Ratio = 3.1
x LOG = 20 cu
Borehole fluid salinity = 80,000 ppm
5 %-in. casing cemented in 8 3/4-in. borehole
Thus, from Chart Tcor-3
0 = 30%
Apparent water salinity = 50,000 ppm
I; wa = 40 cu
If this were a clean formation and connate water salinity was
known to be 150,000 ppm, then
s,= 50,000 =33%
150,000
Figure 5-109. Chart for determining porosity and apparent water salinity from
Dog and ratio curves in 7-in. casing and a 9-in. borehole [199].
