The height of the [[hydrocarbon column]] (h) in the above equations is a theoretical maximum. The actual height is less because of the effect of the reservoir. If the reservoir itself had zero [[displacement pressure]], the height of the hydrocarbon column would attain the theoretical maximum and the oil=water contact would coincide with the [[free water level]]. If the reservoir has some displacement pressure greater than zero, then the height of the hydrocarbon column is less than the theoretical maximum, or
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The height of the [[hydrocarbon column]] (h) in the above equations is a theoretical maximum. The actual height is less because of the effect of the reservoir. If the reservoir itself had zero [[displacement pressure]], the height of the hydrocarbon column would attain the theoretical maximum and the [http://www.glossary.oilfield.slb.com/en/Terms.aspx?LookIn=term%20name&filter=oil-water+contact oil-water contact] would coincide with the [[free water level]]. If the reservoir has some displacement pressure greater than zero, then the height of the hydrocarbon column is less than the theoretical maximum, or