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- Description: This chart is designed to determine the propagation time (tpw) of saltwater solutions. The value of tpw of a water zone is used to determine the temperature variation of the salinity of the formation water. Enter the chart with the known salinity of the zone of interest and move upward to the formation temperature curve. From that intersection point move horizontally left and read the propagation time of the water in the formation on the y-axis. Conversely, enter the chart with a known value of tpw from the EPT Electromagnetic Propagation Tool log to intersect the formation temperature curve and read the water salinity at the bottom of the chart.
- Source: © Log Interpretation Chartbook (2009), Schlumberger
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