Page 232 - Well Logging and Formation Evaluation

222 Well Logging and Formation Evaluation

CHAPTER 3: FULL INTERPRETATION

Exercise 3.1: Full Evaluation of the Test1 Well

From the core data it may be seen that the current cutoff point at 50%
V sh is appropriate.
Calibrating the log porosity against the core: From the plots of poros-
ity and permeability against isostatic stress the following conversions are
estimated:

1.000
0.980
0.960 plug1
POR/PORatm 0.920 plug2
0.940
plug3
0.900
0.880
plug4
0.860
0.840 model (0.95)
0.820
0.800
0 1000 2000 3000 4000 5000 6000
Pisostatic

f in situ = f air *.095

1
0.9
0.8 plug1
PERM/PERMatm 0.6 plug2
0.7
plug3
0.5
plug4
0.4
0.3
0.2 model (0.7)
0.1
0
0 1000 2000 3000 4000 5000 6000
Pisostatic

k -in situ = k air *.07