具有低孔隙度、低渗透率、强非均质性的低渗透砂岩气藏，复杂的孔喉结构及其配置关系决定了内部气水分布的复杂性。通过观察铸体薄片、分析压汞实验资料，对须家河组低渗透高含水饱和度砂岩气藏复杂的孔喉结构成因进行了深入的剖析，解释了高含水饱和度的成因。结合须家河组气水分布，初步总结了3种气水分布模式，其中“储渗单元”控制的气水分布模式是强非均质性储层主要的气水分布类型。根据气水分布特征、构造特征、储层非均质性特征，从宏观和微观、整体与局部分析了控制气水分布的主要因素：区域构造背景控制气水宏观分布；储层的非均质性控制气水局部分布；储层的孔隙类型和孔喉结构的空间配置影响气水微观分异。

The complexity of gas water distribution in the low permeability sandstone gas reservoir is decided by the reservoir characteristics of low porosity, low permeability, strong heterogeneity. The complicated structure and collocation of pore throats results in the complexity of gas\|water distribution in low permeability high water saturation sandstone gas reservoirs. The reasons for the complicated structure and collocation of pore throats are analyzed thoroughly, and the cause of high water saturation is explained. Combined with the gas\|water distribution of the Xujiahe Group reservoir, three gas water distribution models were concluded. Among the three models, the model of gas\|water distribution controlled by reservoir unit is the primary one in the areas of plain structure and strong heterogeneity. Then the main factors of controlling gas water distribution were analyzed from macro scale to micro scale, all to part according to the reservoir characteristics of gas water distribution, structure, and heterogeneity: the area structure background dominates the macro distribution of gas water, the reservoir heterogeneity controls the partial distribution, and the space match between pore types and throat structures affect the micro differentiation of gas and water.