Page 237 - Well Logging and Formation Evaluation
P. 237
Solutions to Exercises 227
CHAPTER 4: SATURATION/HEIGHT ANALYSIS
Exercise 4.1: Core-Derived J Function
A value of S wirr of 0.05 has been assumed. Fitting S wr to J:
1
Swr Core data
Model
0.1
1 10 100
J
This yields a = 0.45 , b =-0.3. The full function is:
+
.
(
.
.
S w = 005 0 45* JŸ -03 )
.
J = (1 02 0 85 ) 0 433 3 281* . * . ( * h)* k ( f ) 26
-
.
-
h = (646 depth )
Where h is in m, k in md, f as fraction.
Using the core derived J function actually resulted in a slight drop (2%)
in the equivalent hydrocarbon column. This indicates that thin beds are
not much of an issue in this sand, as is evidenced by the logs. Also, the
deep resisitivity is a good estimate of R t .
