Auxiliary Salt Guardian Measurements

In a  standard measurement on a salt guardian cable we collect 13 measurements. Each measurement contains information about the subsurface. As is intuitively clear (and described in detail in a 1993 article by Xu and Noel ) we can do other measurements that have additional information about the subsurface. Xu and Noel introduce the concept of complete datasets – datasets that have all possible independent measurements, and prove that for 26 electrodes this number is 299. Even if (because the electrodes are in a pair close to each other, and we can therefore consider these electrodes as equivalent) we see the cable as a cable with 13 electrodes, we can still make 65 independent measurements on such a cable. Taking these measurements was not practical in the 1970s, but today these measurements can be collected automatically and quickly by using a multi-electrode system – eg the system used by Metinco.

These kinds of measurements can be used to make measurements that are more comparable to each other, as well as to make measurements that can be used in advanced analysis models.