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Water resistivity determination (view source)
Revision as of 15:33, 25 April 2014
, 15:33, 25 April 2014→Principle
===Principle===
===Principle===
If a clean, water-bearing zone is present or can be assumed, ''R''<sub>w</sub> can be calculated by using the Archie equation. The zone or permeable bed in which water resistivity is determined is selected on the log. This zone must be 100% water saturated and must not contain any clay or shale. The bed must be thick so that the deep investigation resistivity device is not affected by shoulder beds.
If a clean, water-bearing zone is present or can be assumed, ''R''<sub>w</sub> can be calculated by using the [[Archie equation]]. The zone or permeable bed in which water resistivity is determined is selected on the log. This zone must be 100% water saturated and must not contain any clay or shale. The bed must be thick so that the deep investigation resistivity device is not affected by shoulder beds.
The water saturation equation in general form is
The water saturation equation in general form is