凝灰质砂岩储层是海拉尔盆地乌尔逊凹陷最主要的储层。由于凝灰质对储层导电机制影响很大， 传统的阿尔奇公式在此已不适用。通过建立体积模型，确定各成分骨架参数，可计算凝灰质的体积含量。 该文借鉴托尔诺布伊东的饱和度模型，针对凝灰质砂岩储层，对饱和度模型进行了一定的改进。在导电模型中，粘土的附加导电性不可忽略，同时凝灰岩成分的存在增加了岩石的导电性，将凝灰质砂岩的电阻 看作是凝灰岩成分、泥质成分和地层水的电阻并联之和。应用该模型对凝灰质砂岩进行评价，经试油验证效果良好。

The tuffaceous sandstone reservoir is the most important reservoir inWuerxun Sag ofHailar Basin. To strike the water saturation accuracy is very important. There is a great influence on the conduction mechanism of reservoir because of presence of tuffaceous, and then the conductivity can not be fully in accordance with the Archie formula. In the establishment of saturation model to calculate the content of tuffaceous is necessary. The volume model has been established, then by determining the framework parameters of the components, programming is used to strike the volume content of the tuffaceous. Reference the Oshinobu Itoh saturation model, saturation model of tuffaceous sandstone is improved. In the conductivitymodel, the additional conductive of clay can not be ignored, at the same time the existence of tuffaceous rocks increases the conductivity, the resistance of tuffaceous sandstone will be parallel by the resistance of tuffaceous, muddy and the formation water. Actual data processing of the tuffaceous sandstone reservoir has proved the newmodel is much better than the conventional one.