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Comparison of Dipole-Dipole IP/Resistivity and CSAMT Results Along the Same Line

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Case Study – [pdf] Wadi Almarsad Data Comparison

This study compares dipole-dipole IP data and CSAMT data acquired along the same line with the same Zonge GDP receiver and GGT transmitter during a training exercise at Wadi Almarsad, Kingdom of Jordan. A Zonge magnetic field antenna was also used for the CSAMT survey. The two data sets show very good agreement and the advantages of both methods are demonstrated.

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

method provides better resolution and much deeper information, without the time needed to change dipole sizes or location. However, the induced polarization information provided by the dipole-dipole method indicates that the shallow conductor at station 200 is not polarizable and thus would not be an attractive target if the goal of the survey was to locate sulfide mineralization.

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.