Vs. Sarma et al., Physical modeling results on modified pseudo-depth sections in explorationof highly resistive targets - II, PUR A GEOPH, 158(4), 2001, pp. 813-820
This work extends the results that APPARAO et al. (1997a) obtained for a ve
rtical resistive sheet to the case of inclined resistive sheet models for d
ifferent electrode arrays. It is found that the depth of investigation (DI)
remains the same as that for the vertical target. Using this DI, modified
pseudo-depth sections have been constructed over sheet models at different
inclinations. It is noted that, for the Wenner array, the maximum anomaly c
ontours fall directly over the target cross section. For dipole-dipole and
three-electrode arrays, these contours fall on the up-dip side of the dippi
ng target, with the maximum anomaly contour matching the depth level of the
top of the target. It is also observed that the target cross section is at
a distance of about 0.33L (L/3) from the maximum anomaly value/contour pos
ition for the three-electrode array and 0.25L (L/4) for the dipole-dipole s
ystem. These features are identifiable in the individual profiles and may h
elp field geophysicists in the recognition and location of dipping target b
odies.