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Line 137: − + − − [[file:predicting-reservoir-system-quality-and-performance_fig9-35.png|thumb|{{figure number|9-35}}. Copyright: Schlumberger.]]
Spontaneous potential logs in water resistivity calculation (view source)
Revision as of 17:28, 4 March 2014
, 17:28, 4 March 2014→Step 4: convert SP to rwe
==Step 4: convert SP to r<sub>we</sub>==
==Step 4: convert SP to r<sub>we</sub>==
[[file:predicting-reservoir-system-quality-and-performance_fig9-35.png|thumb|{{figure number|4}}. Copyright: Schlumberger.]]
Follow the procedure below to convert SP from the zone of interest to equivalent formation water resistivity (R<sub>we</sub>).
Follow the procedure below to convert SP from the zone of interest to equivalent formation water resistivity (R<sub>we</sub>).
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| Enter the base of Figure 9-35 with SP (SP is negative if it deflects to the left of the shale base line). Follow the SP grid line up the chart to the appropriate formation temperature. At this point, move across the chart and read the R<sub>mf eq</sub> /R<sub>we</sub> Value.
| Enter the base of [[:file:predicting-reservoir-system-quality-and-performance_fig9-35.png|Figure 4]] with SP (SP is negative if it deflects to the left of the shale base line). Follow the SP grid line up the chart to the appropriate formation temperature. At this point, move across the chart and read the R<sub>mf eq</sub> /R<sub>we</sub> Value.
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| Solve for R<sub>we</sub> using the equation R<sub>we</sub> = R<sub>mf</sub><sub>eq</sub> /(R<sub>mf</sub><sub>eq</sub> /R<sub>we</sub> value).
| Solve for R<sub>we</sub> using the equation R<sub>we</sub> = R<sub>mf</sub><sub>eq</sub> /(R<sub>mf</sub><sub>eq</sub> /R<sub>we</sub> value).
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==Step 5: convert r<sub>we</sub> to r<sub>w</sub>==
==Step 5: convert r<sub>we</sub> to r<sub>w</sub>==