Specifications

University of Pretoria etd – Combrinck, M (2006)

0.001

0.01

0.1

0 50 100 150 200 250 300 350 400 450 500

Depth [m]

Apparent conductivity [S/m]

Input model

SLDT: no depth factor

SLDT: depth factor 1

SLDT: depth factor 2

SLDT: depth factor 3

TEMIX 3L inversion

TEMIX 10L smooth inversion

Figure 4-20: Comparison of S-layer differential transform (SLDT) solutions using different

depth factors and layered earth inversions of synthetic data for a three layer earth (thin

conductive layer).

In the case of a thin conductive layer correction factor 3 is the most accurate of the

SLDT’s (S-layer differential transform) and also outperforms the smooth layer inversion

(Figure 4-20).

MODEL 3: Three-layer earth (thick conductive layer)

Layer Thickness Resistivity (conductivity)

1 150 m 50 ohm.m (0.02 S/m)

2 50 m 5 ohm.m (0.2 S/m)

3 inf 50 ohm.m (0.02 S/m)