Figure F57. Water saturations from Archie's equation and LWD porosity and resistivity logs. The intervals marked in gray correspond to hole enlargements, where the measured density is erroneously low and the calculated water saturation is unreliable. Rw = formation water resistivity, m = cementation coefficient, R0 = computed formation resistivity for 100% water saturation, Rt = measured resistivity, Sw = water saturation, RAB = resistivity-at-the-bit image from the GeoVISION tool.
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