解释油水层和划分有效厚度的关键是合理地确定油水层的判别界限——含油饱和度下限。以大芦湖油田为例，讨论了利用渗流力学理论，引入相渗透率资料，建立产水率与含水饱和度的关系，并由动态资料建立日产油量与产水率关系，由工业油流标准算出产水率截止值，从而反求含油饱和度下限值的方法。所得饱和度下限值与传统方法对比，吻合较好。显然，相渗透率资料的引入，有助于避免油水层界限研究工作中的失误 The key to interpreting the oil-water layer and dividing the effective thickness is to reasonably determine the discriminant limits of the oil-water layer, the lower limit of oil saturation. Taking Daliu Oilfield as an example, the relationship between water production rate and water saturation is discussed based on the seepage mechanics theory and the phase permeability data. The relationship between daily oil production and water production rate is established by dynamic data, Calculate the cut-off value of the water yield, thereby reversing the lower limit of oil saturation method. The lower limit of saturation obtained is in good agreement with the traditional method. Obviously, the introduction of permeability data helps to avoid mistakes in the study of the boundary layer