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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 in the Wuerxun depression of the Hailar Basin. Since tuff has a great influence on the conductive mechanism of the reservoir, the traditional Archie formula is not applicable here. Through the establishment of volume model to determine the skeleton parameters of each component, the volume content of tuff can be calculated. This paper draws on the saturation model of Tornob Ito and makes some improvements on the saturation model for the tuffaceous sandstone reservoir. In the conductive model, the additional conductivity of the clay can not be ignored, while the presence of tuff composition increases the conductivity of the rock, the resistance of tuffaceous sandstone as tuff composition, muddy composition and formation water resistance parallel. The model was applied to the evaluation of tuffaceous sandstone. The test oil proved to be effective.