Specifications

University of Pretoria etd – Combrinck, M (2006)

The top of the conductor is defined better by the high frequency. The medium frequency

shows behaviour as in Figure 4-44 where it was found that when a conductor is

shallower than the depth to where the 1

channel would plot in the surrounding half

space (compare the depths of the first channel plots on the rest of the line), the

cumulative conductance and conductivity curves are distorted. Block B indicates the

capability of the method and the algorithm to map a deep conductor below a shallower

one provided the right time channels are measured (two conductors on high frequency,

only one visible on medium frequency). Block C indicates a good match between the

frequencies with the medium frequency data containing some noise.

Figure 5-10: Line 1650N showing poor correlation between the high (top) and medium

frequencies (bottom).

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