In an oil-water system, the water saturation and oil saturation (S<sub>o</sub>) sum to 1. Therefore, once S<sub>w</sub> has been determined, oil saturation can be calculated and mapped as ''S''<sub>o</sub> = 1–''S''<sub>w</sub>.
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In an oil-water system, the [[water saturation]] and oil saturation (S<sub>o</sub>) sum to 1. Therefore, once S<sub>w</sub> has been determined, oil saturation can be calculated and mapped as ''S''<sub>o</sub> = 1–''S''<sub>w</sub>.