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国内盐岩储气库由于建库盐层本身地质特点,在造腔结束后,底部一般会堆积大量的不溶物,既浪费了部分有效库容,又为整体建库施工带来诸多不利.为科学评价储气库腔底堆积物,合理采取后续作业处理措施,需要对其分布特性进行研究.首先对其形成过程和存在影响进行了分析阐述,并通过室内实验获取了堆积物岩样,然后利用实验测定了粒度分布数据,最后采用分形分布理论研究其粒度分布特征.结果表明:在双对数坐标系下,腔底堆积物颗粒尺寸与累积数量呈线性关系,即其粒度分布具有分形特点,且分布分形维数可作为描述其粒度分布的特征参量,用以反映颗粒的均匀程度与集中性.研究成果可为堆积物体积评价、后续作业处理措施布置以及腔体库容计算提供理论参考与借鉴.“,”At domestic salt rock gas storages,a large amount of insoluble substance is deposited at the bottom of storages after its solution mining is completed,due to the inherent geological characteristics of the salt rock which is used for gas storage building.The existence of deposits occupies parts of effective storage and brings a lot of adverse factors to the overall construction of the gas storage.In order to evaluate the deposits at the bottom of the cavern scientifically and accordingly take the treatment measures in the following operation rationally,it is necessary to investigate the distribution characteristics of the deposits.At first,the formation process and effects of deposits were analyzed and illustrated.Then,the insoluble deposits were sampled from laboratory experiment and its granularity distribution data were measured.Finally,its granularity distribution characteristics were analyzed based on the fractal distribution theory.It is indicated that the particle size of deposits at the cavern bottom is in linear relationship to the cumulative quantity in the double logarithm coordinate system.It means that its granularity distribution is characterized by a fractal function,and the fractal dimension,as the characteristic parameter for describing the granularity distribution,can be used to reflect the uniformity and centrality of particles.The research results provide the theoretical reference and basis for the deposit volume evaluation,the treatment measure arrangement in the following operation and the storage capacity calculation.