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Amplitude
-1
Amplitude
-1
Amplitude
-1
Amplitude
-1
Location
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
Loop (Tx)
0
0
A
100
100
U
Rx
200
200
Centre of
target
Early time
300
300
Section (VE=1)
A
B
C
D
400
Depth (m)
400
AB C
D
Target responses
Depth (m)
Amplitude
-1
Amplitude
-1
Amplitude
-1
Amplitude
-1
Amplitude
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
-10
3
-10
2
-10
1
0
1
10
1
10
2
10
3
-10
3
-10
2
-10
1
0
1
10
1
10
2
1
0
3
-10
3
-10
2
-10
1
-1
0
1
10
1
10
2
1
0
3
0
100
200
300
Early
time
Early
time
A
B
C
D
400
Depth (m)
Target & overburden responses
Overburden responses (C)
Axial (
A
) component
Radial (
U
) component
Conductive overburden (not always present)
Target conductor
Figure 5.94
Computed DHEM model responses for the axial and horizontal components in four drillholes (A
-
D) for a horizontal
finite thin plate conductor located directly below the
surface transmitter loop, conductive overburden layer, and their combined responses. Overburden response shown for drillhole C.
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