This paper describes a continuous form of the governing equations for compositional reservoir simulation. A continuous overall balance or pressure equation is created from a weighted sum of the component balances. The overall balance is the continuous analog of the discrete pressure equation in the volume-balance method and other IMPES (IMplicit-Pressure Explicit Saturation) methods for reservoir simulation. The coupling between the overall balance and the component balances is analyzed, and some possible algorithmic improvements, which utilize this work, are suggested.

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