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Line 148: − − [[file:determination-of-water-resistivity_fig3.png|left|thumb|{{figure number|3}}Log used in example of calculation of water resistivity. Copyright: the SP method. (From <ref name=pt04r20>Western Atlas International, 1985, Atlas log interpretation charts: Houston, TX.</ref>; courtesy of Atlas Wireline Division of Western Atlas.]]
Water resistivity determination (view source)
Revision as of 22:19, 20 January 2014
, 22:19, 20 January 2014no edit summary
Equation 1 is used in the quantitative interpretation of the SP log.
Equation 1 is used in the quantitative interpretation of the SP log.
[[file:determination-of-water-resistivity_fig3.png|left|thumb|{{figure number|3}}Log used in example of calculation of water resistivity. Copyright: the SP method. (From <ref name=pt04r20>Western Atlas International, 1985, Atlas log interpretation charts: Houston, TX.</ref>; courtesy of Atlas Wireline Division of Western Atlas.]]
===Procedure===
===Procedure===
* Finally, the true value of ''R''<sub>w</sub> is derived from its equivalent ''R''<sub>we</sub> value, again using the appropriate charts.
* Finally, the true value of ''R''<sub>w</sub> is derived from its equivalent ''R''<sub>we</sub> value, again using the appropriate charts.
An example of calculating ''R''<sub>w</sub> by using the SP method is as follows. Figure 3 shows the log used in this example. The following charts are required:
An example of calculating ''R''<sub>w</sub> by using the SP method is as follows. [[:file:determination-of-water-resistivity_fig3.png|Figure 3]] shows the log used in this example. The following charts are required:
{| class = "wikitable"
{| class = "wikitable"
==Resistivity ratio method==
==Resistivity ratio method==
===Principle===
===Principle===