Page 134 - Reservoir Geomechanics
P. 134
a.
600
500
Frequency (counts) 400
300
200
100
MEAN = 1484 psi
0
0 1000 2000 3000 4000 5000
UCS (psi)
b.
700
600
500
Frequency (counts) 400
300
200
100
MEAN = 1053 psi
0
0 1000 2000 3000 4000 5000
UCS (psi)
c.
1500
Frequency (counts) 1000
500
MEAN = 1878 psi
0
0 1000 2000 3000 4000 5000
UCS (psi)
Figure 4.18. Histogram of shale strengths for the log-derived values shown in Figure 4.17: (a),
(b) and (c) correspond to equations (11), (12) and (18) in Table 4.2, respectively. Note that the
mean strength varies considerably, depending on which empirical relation is chosen. After Chang,
Zoback et al.(2006). Reprinted with permission of Elsevier.
