Electrical Properties (Induction) Logging

  • Lee M. Etnyre


Resistivity, an electrical property, was the first rock property logged in a well, and it is still one of the most important properties logged. Recall from Chapter 3 that most water saturation calculations are based on establishing a ratio of resistivities. If we compare a rock’s resistivity to the resistivity it would have at 100% water saturation, we can calculate the water saturation from Archie’s equation. Then we can infer that the balance of the pore spaces are occupied by hydrocarbon. However, we must resist the temptation to draw the apparently logical conclusion that the resistivity curves recorded on a log are saturation curves. A low resistivity does not by itself mean there is a high water saturation. We must still compare the resistivity to the value it would have if saturated with water. This requires knowledge of the rock’s porosity as well as its resistivity.


Apparent Resistivity True Resistivity Ground Loop Deep Induction Undisturbed Zone 
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© Springer Science+Business Media New York 1989

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  • Lee M. Etnyre

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