A petroleum reservoir consists of a zone with hydrocarbons that may potentially be produced and used as an energy resource. The hydrocarbons may have liquid (oil) properties, gas properties or the reservoir may consist of an oil zone with a gas cap on top. Often a water-rich zone is found beneath the hydrocarbon zone. The petroleum reservoir fluids found in the hydrocarbon zone may be divided into

The various fluid types can be distinguished by the content of heavy hydrocarbons and by the phase behavior (number of phases, phase compositions and phase properties). Table 11 shows examples of each...

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