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文章通过建立理论模型，对压力变化后的气藏孔隙度、含水饱和度、束缚水饱和度和可动水饱和度进行理论上的研究，并对实际岩心进行数据分析。研究发现，在气藏的开采过程中，随着气藏压力的降低，气藏含水饱和度逐步上升，束缚水饱和度也随之上升；但是，含水饱和度的上升速度大于束缚水饱和度上升的速度，这就造成了一部分束缚水解放出来变成可动水，这些可动水将会对气藏的开采造成重要的影响。

Pressure-sensitive Effect Study of Movable Water Saturation in Gas Reservoirs by Block Model

With theoretical model, the porosity, water saturation, irreducible water saturation and movable water saturation of gas reservoirs are theoretically studied after the pressure changes. And some core data are analyzed. The study found the water saturation increases and the irreducible water saturation increases either as the gas reservoir pressure decreases during the process of gas recovering. However, the increasing rate of water saturation is bigger than that of irreducible water saturation, which makes some irreducible water become free water. The free water will influence the production of gas reservoirs severely.