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The '''free water level''' is located at the base of a [[hydrocarbon column]] and the [[transition zone]]. Above this level, the reservoir produces water alone, hydrocarbon and water, or hydrocarbon alone on a [[production test]]. Below this level lies the aquifer of a [[water drive]] reservoir system. It produces water only. Zero [[buoyancy pressure]] exists at this level or below.

The '''free water level''' is located at the base of a [[hydrocarbon column]] and the [[Fluid contacts|transition zone]]. Above this level, the reservoir produces water alone, hydrocarbon and water, or hydrocarbon alone on a [[production test]]. Below this level lies the aquifer of a [[Drive mechanisms and recovery#Water drive|water drive]] reservoir system. It produces water only. Zero [[buoyancy pressure]] exists at this level or below.

==See also==

==See also==

* [[What is a reservoir system?]]

* [[Reservoir system]]

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[[Category:Reservoir engineering]]

[[Category:Reservoir engineering]]