Comparison of Dipole-Dipole IP/Resistivity and CSAMT Results Along the Same Line
Case Study – [pdf] Wadi Almarsad Data Comparison
The survey line is on relatively flat ground crossing a narrow valley. The alluvial fill material was expected to be at a depth of less than 200 meters, except in the center of the valley.
After smooth-model inversion, the two data sets look very similar. Both methods indicate the bedrock on the west slopes more steeply than on the east, and both indicate a shallow conductor near station 200. Even a weak, surface low at station 800 is seen in both data sets. The CSAMT
In an efficient exploration scenario, CSAMT would be used to map resistivity structures in this valley, to determine depth-to-bedrock, and to locate faults and resistivity anomalies. Then, using the same equipment, dipole-dipole IP (slower and somewhat more expensive) would be used only in specific areas to add IP information. Since depth of the specific targets would already be known from the CSAMT results, dipole sizes for the IP survey could be determined in advance, which eliminates more costly testing.