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In-Depth Information
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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