Fluid contacts

The contact surfaces in reservoir between hydorcarbon and water phases, forming by gravity and capillary pressure.

Oil Water Contact (OWC)	Error rendering macro 'excerpt-include' No link could be created for 'Oil Water Contact (OWC)'.
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
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.
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.

Fig. 1. Fluid contact schematic: gas in yellow, oil in green, hydrocarbon-water transition in blue and free water in aqua.

Usually the fluid contacts are relatively flat but varying reservoir properties may lead to inclination of the contact surface.

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