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Free Water Level (FWL)

The highest elevation at which the pressure of the hydrocarbon phase is the same as that of water

It marks the depth point in which the pressure gradient in water-saturated and oil-saturated reservoir meet.

Oil Water Contact (OWC)

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Oil Water Transition

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Gas Oil Contact (GOC)

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Gas Water Contact (GWC)

The highest elevation below gas reservoir at which mobile water occur 


Fig. 1. Fluid contact schematic: gas in yellow, oil in green and water in blue.




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