Fluid contacts

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)	Error rendering macro 'excerpt-include' No link could be created for 'Oil Water Contact (OWC)'.
HC-Water Transition	This interval is characterised by commingled hydrocarbon and water production from the same reservoir. The height of the interval may vary from dozens of meters to fraction of a meter depending on capillary pressure.
Gas Oil Contact (GOC)	Error rendering macro 'excerpt-include' No link could be created for 'Gas Oil Contact (GOC)'.
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, hydrocarbon-water transition in blue and free water in aqua.

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