2020年8月10日，《财富》世界500强排行榜发布。最新的榜单显示，2020年上榜的中国企业数量达（）家，继2019年之后再次超过美国（121家），蝉联榜首。

To develop the material balance equation for a volumetric geopressure gas reservoirs， the drive mechanism including（）during the productive life of the reservoir.

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If we analyze the geopressured reservoir using techniques for normally pressured reservoirs， we will（）the original gas in place .

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Using volumetric method， the original gas in place can be calculated by（）.

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Depend on the value of the decline exponent has different forms， these forms of decline are（）.

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The basis of decline curve analysis is that future production continues to follow the past trend， we can use these models to estimate（）.

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The Arps’ decline equation is based on important and widely violated assumptions including（）.

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For exponential decline， there are some straight lines of（）.

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（）called constant percentage decline， is characterized by a decrease in production rate per unit of time .

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The Fetkovich decline type curves are based on（） to the flow equations for production at constant BHP.

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Application of the Fetkovich type curves， we can estimate（）.

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