Geology Reference
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Figure 8.6f.
Eccentered steel mandrel, conductive mud.
8.3 Longitudinal Magnetic Fields
In this computational suite, we consider five horizontal well results for the
inhomogeneous formations shown in Figure 8.7 with isotropic layers. A six
inch, 20 KHz “coil alone” induces strong interfacial charge polarization in all
cases. But we are less interested here in resistivity logging, as we are in Nuclear
Magnetic Resonance (NMR) “sensitive volume” imaging; as such, we study the
longitudinal magnetic fields associated with our circular transmitter coils.
Case 1
Case 2
Case 3
22 in
6
3
0
1
m
100
m
Case 4
Case 5
Legend
Figure 8.7.
Five baseline logging scenarios.
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