问答题
简答题
翻译：The fluids of a petroleum reservoir are generally gas, oil, and water in varying proportions. Each phase can differ widely in composition and properties. Gas and oil, either as separate fluids or in mixtures, change their state or phase as reservoir pressure changes.
【参考答案】
油层中的流体是天然气、石油和水各占不同的比例。在不同的状态下它们的性质和组成是不同的。气和油既可以是分开的流体，也可以......
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