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In a resistivity survey, how do we calculate the depth of penetration for a Schlumberger array?

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  • $\begingroup$ I thought I had this in a book (GSL Field Geophysics pocket book), but alas not. Of course the electrical field is continuous so you are going to have a depth that represents something like "half the sensitivity is shallower than this". $\endgroup$ – winwaed Sep 17 '14 at 13:06
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Short answer: 0.2 times the total length of your cable(s).

100m rollout --> ~20m depth

Bear in mind that the deeper you get, the more you have to be careful with your data interpretation. Also if you do a roll-along your depth doesn't get deeper.

Long answer see Bernard J (2003): Short note on the depth of investigation of electrical methods. Heritage Geophysics.

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