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cp-1d
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Crossplots for Porosity, Lithology and Saturation
4-17
CP
Porosity and Lithology Determination fromFormation Density Log and CNL* Compensated Neutron LogFor CNL logs before 1986, or labeled NPHI
CP-1d
0 10 20 30 40
φCNLcor, neutron porosity index (p.u.) (apparent limestone porosity)
Salt water, liquid-filled holes (ρf = 1.1)
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
3.0
ρ b, b
ulk
dens
ity (
g/cm
3 )
φ D, d
ensi
ty p
oros
ity (
p.u.
) (ρ
ma
= 2
.71;
ρf =
1.1
)
45
40
35
30
25
20
15
10
5
0
–5
–10
–15
Porosity
Sulfur Salt
Approximategascorrection
0
Anhyd
rite
PolyhaliteLangbeinite
Calcite (li
mestone)
0
45
5
15
10
20
25
30
35
40
Dolom
ite
30
0
5
15
10
20
25
35
40
Quartz sa
ndstone
30
0
5
15
10
20
25
35
40
45
*Mark of Schlumberger© Schlumberger
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