根据岩石的成分及结构特征，建立单位岩石体积模型，提出了孔喉中的地层水以粘土水、薄膜水、可动水、束缚水或死水形式存在的“多水模型”；导出了以不同形式存在的地层水体积对应的有效孔隙度、非有效孔隙度及饱和度间的关系方程；非有效孔隙度是泥质含量和砂岩颗粒间微喉体积的函数；以实验室分析的岩石总孔隙度、有效孔隙度和泥质含量等物性参数为基础，建立了岩石结构孔隙度计算方程，为客观评价砂岩储层、采用合理方式开发砂岩油气藏奠定了基础。%Based on the rock composition and structural characteristics, the rock unit volume model is established. In the view of formation water in pores and pore throat existing in multiple forms of clay water, thin film water, mobile water, irreducible water or dead water, a new kind of model, called ＇ multiple water model＇ ,is proposed. The porosity - saturation correlation equations are derived for different forms of formation water. Non - effective porosity is the function of micro pore throat volume of grains including shale and sand grains. Based on the laboratory analysis of rock＇ s total porosity,effective porosity and shale content,the equation for structural porosity calculation is established,which provides the foundation for the sand reservoir evaluation, and better development of sandstone reservoir.
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