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使砂岩模型饱和不同盐水，以模拟水淹层，并测得相应的自然电位曲线。结果表明，水淹层的自然电位测井响应出现了异常。这种异常主要表现在自然电位异常幅度、自然电位曲线的基线偏移方向以及偏移幅度等几个方面，而且由水淹方式、水淹程度、原生地层水的性质、岩性、层厚和井眼流体性质等因素所决定。说明自然电位测井能够用来识别水淹层及水淹方式、评价水淹程度、确定水淹层的混合液矿化度，但一定要考虑原生地层水的性质、岩性、层厚和井眼流体性质等非水淹因素的影响。
The sandstone model was saturated with different brine to simulate the flooded layer and the corresponding natural potential curve was measured. The results show that the natural potential well logging response of the flooded layer is abnormal. This anomaly is mainly manifested in several aspects such as the amplitude of natural electric potential anomaly, the direction of baseline deviation of natural potential curve, and the range of offset, etc., and is characterized by the submergence method, the degree of flooding, the nature of primary formation water, lithology, Wellbore fluid properties and other factors. It shows that natural potential logging can be used to identify the flooded layer and flooding mode, evaluate the flooding degree and determine the salinity of the mixture in the flooded layer, but we must consider the nature, lithology, layer thickness and well Eye fluid properties such as non-flooding factors.