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Water resistivity determination (view source)
Revision as of 19:37, 6 November 2015
, 19:37, 6 November 2015no edit summary
* [[Basic open hole tools#Spontaneous potential|SP]] method
* [[Basic open hole tools#Spontaneous potential|SP]] method
* Archie equation
* [[Archie equation]]
* Resistivity ratio method
* Resistivity ratio method
===Procedure===
===Procedure===
The procedure to determine ''R''<sub>w</sub> from the Archie equation is outlined as follows. The data that are required include ''R''<sub>t</sub> (or ''R''<sub>o</sub>) from deep-reading resistivity tools such as deep induction (ILd) or deep laterolog (LLd) and porosity log(s).
The procedure to determine ''R''<sub>w</sub> from the [[Archie equation]] is outlined as follows. The data that are required include ''R''<sub>t</sub> (or ''R''<sub>o</sub>) from deep-reading resistivity tools such as deep induction (ILd) or deep laterolog (LLd) and porosity log(s).
* After correlating logs for depth mismatch, a clean, water-bearing zone is located. If using an induction log, the minimum thickness should be [[length::15 ft]]. For a laterolog, the minimum thickness should be [[length::4 ft]].
* After correlating logs for depth mismatch, a clean, water-bearing zone is located. If using an induction log, the minimum thickness should be [[length::15 ft]]. For a laterolog, the minimum thickness should be [[length::4 ft]].