Page 202 - Standard Handbook Petroleum Natural Gas Engineering VOLUME2
P. 202
Formation Evaluation 171
45
40 -
35 ;
II
30 5
F
cu
25 11,
E
cz
-
20 ,y
=I
n
15 p
89
lo .- b
UJ !=
52
d
8
0
-5
-10
-1 5
0 10 20 30 40
$cNL~~~, Neutron Porosity Index (pu)
(Apparent Llrnestone Porosity)
Figure 5-98. Chart for finding porosity and matrix composition from a
FDC-CNL log combination in salt water [199].
Two types of tools are available [212]:
1. VHF sondes that have frequencies of 20-47 Mhz (found in the deep
propagation tool [Schlumberger], and dielectric tools [Dresser-Atlas and
Gearhart-Owen], and
2. UHF sondes that have a frequency of 1.1 GHz (found in the electro-
magnetic propagation tool [Schlumberger]).
The only tool that is currently available is Schlumberger’s electromagnetic
propagation tool (EPT); the others are still experimental [212].
