Chapter 7. Saturated Oil Reservoirs
7.1 Introduction
The final reservoir type is the saturated oil reservoir and is distinguished by the presence of both liquid and gas in the reservoir. The material balance equations discussed in Chapter 6, for undersaturated oil reservoirs, apply to volumetric and water-drive reservoirs in which there are no initial gas caps. However, the equations apply to reservoirs in which an artificial gas-cap forms, owing either to gravitational segregation of the oil and free gas phases below the bubble point or to the injection of gas, usually in the higher structural portions of the reservoir. When there is an initial gas cap (i.e., the oil is initially saturated), there is negligible liquid expansion energy. However, ...
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