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- Description: The sigma value (Σw) of a saltwater solution can be determined from this chart. The sigma water value is used to calculate the water saturation of a formation. This chart defines sigma water for pressure conditions of ambient through 20,000 psi and temperatures from 68° to 500°F [20° to 260°C]. Enter the appropriate chart for the pressure value with the known water salinity on the y-axis and move horizontally to intersect the formation temperature. The sigma of the formation water for the intersection point is on the x-axis.
- Source: © Log Interpretation Chartbook (2009), Schlumberger
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