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Fig. 11.47
Geologic
cros-section of The Women's
Pocket Anticline and
pseudo-sections of effective
impedance phase
a
NE
SW
eff
and
apparent resistivity
1000
eff
;
(
a
) geologic cross-section,
(
b
) pseudo-section of
eff
,
2000
(
c
) pseudo-section of
eff
(Ranganayaki, 1984)
3000
z,
m
b
0.04
ϕ
eff
0.4
4
40
T,
s
c
25
ρ
eff
0.04
0.4
4
25
40
35
25
50
T,
s
35
75
presents the geologic cross-section of the steep anticlinal fold (The Woman's Pocket
fold in Golden Valley County, Montana) as well as
eff
pseudo-sections
plotted along the same profile. It is rather instructive to see how closely the
eff
and
eff
pseudosection resembles the geologic cross-section. Moving from the SW side of
the fold to its NE side, we observe a sharp decrease in
eff
(
T
=
.
−
0
04
4s), which
