Specifications

University of Pretoria etd – Combrinck, M (2006)

0.05

0.1

0.15

0.2

0.25

0 100 200 300 400 500 600 700 800 900

Depth [m]

Imaged Conductivity [S/m]

0.1 S/m

0.04 S/m

0.02 S/m

0.01 S/m

0.0067 S/m

0.005 S/m

0.0002 S/m

Figure 4-45: Imaged conductivity for a 0.2 S/m layer of 20 m thickness at 150 m depth in various

host rock conductivities - linear scale.

Examining the S-layer transform performance in delineating a layered earth provides

important insights into the characteristic behaviour and effectiveness of the technique.

However, in order to map the subsurface accurately the study has to be extended to bodies

with finite dimensions. Conductive, horizontal plates and prisms are modelled and their S-

layer transform responses analysed in the following two sections.

4.5.3.5 Conductive, horizontal plates in a half space

The S-layer transform response of conductive horizontal plates with a thickness of 20 m

and varying horizontal dimensions are compared to that of the infinite layer. This is done

for both the low and high contrast scenarios. The side lengths of the square plates were

chosen as 100 m, 200 m, 300 m and 400 m respectively and conductivities of 0.2 S/m and

2 S/m were used in a 0.02 S/m host rock. The low contrast results are shown in Figures 4-

46 to 4-48 and the high contrast results in Figures 4-49 to 4-51.