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Fig. 11.59
The Obukhov
transformation of the
apparent-resistivity curves in
the Ciskopetdag foredeep:
- longitudinal apparent
resistivity,
ρ
A
,
Ohm
.
ρ
int
ρ
int
ρ
ρ
int
5
ρ
int
ρ
ρ
ρ
3
ρ
ρ
2
ρ
ρ
10
⊥
- transverse
apparent resistivity,
int
-internal transverse
apparent resistivity
5
3
2
1
T,
s
1/2
10
10
10
10
10
influence of excess currents concentrated at both sides of the resistive segment
(effect of false conductive layer). On the
Z
int
int
−
curve, which assumes the bell-like form and approaches the locally normal ¨
−
transformation, we get the
n
−
curve.
Convincing example of Obukhov's transformation is given in Fig. 11.59. We
see the transverse and longitudinal apparent-resistivity curves obtained across and
along the Ciskopetdag foredeep. Note that the transverse
⊥
−
curves have a gently
inclined ascending branch and they flatten as we approach the Kopetdag. This is a
manifestation of the regional flow-around effect (the transverse current flows around
the resistive mountain ridge). The Obukhov transformation straightens the ascend-
ing branches of the
int
−
curves and they approach the slightly distorted longitudinal
−
curves.
