cp-1c
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cp-1c
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Crossplots for Porosity, Lithology and Saturation
4-16
CP
Porosity and Lithology Determination fromFormation Density Log
and CNL* Compensated Neutron LogFor CNL logs before 1986, or
labeled NPHI
CP-1c
0 10 20 30 40CNLcor, neutron porosity index (p.u.) (apparent
limestone porosity)
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
b, bu
lk de
nsity
(g/cm
3 )
D, de
nsity
por
osity
(p.u.
) (m
a =
2.
71;
f = 1.
0)
45
40
35
30
25
20
15
10
5
0
5
10
15
Poro
sity
SulfurSalt
Approximategascorrection
0
Anhy
drite
PolyhaliteLangbeinite
Calcit
e (lime
stone
)Qu
artz s
andst
one
Dolom
ite
0
45
5
15
10
20
25
30
35
40
30
0
5
15
10
20
25
35
40
30
0
5
15
10
20
25
35
40
Fresh water, liquid-filled holes (f = 1.0)
*Mark of Schlumberger Schlumberger
