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15. If an oil formation has a water (NaCl only) resistivity of 0.1.m and then invaded during drilling by mud filtrate having resistivity of 1.3m.

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15. If an oil formation has a water (NaCl only) resistivity of 0.1.m and then invaded during drilling by mud filtrate having resistivity of 1.3m. If the SP log reads -100 mv at that formation, then the water salinity of this formation is 25,000ppm 35,000ppm 2,500 ppm

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