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按照中国目前陆源碎屑岩划分和命名的主要标准,可将陆源碎屑岩的细砂岩——泥岩系列划分为11种岩石类型。考虑到岩心录井,尤其是岩屑录井和电测曲线岩性解释工作中的实用性,将11种岩石类型作为各自独立的对象并组成对象集,经过数据的处理和标准化,计算切比雪夫距离,进行聚类分析。结果表明,当距离系数为0.2564～0.4231时,细砂岩——泥岩系列的11种岩性可综合归类为泥岩、泥质粉砂岩、粉砂岩、粉砂质细砂岩和细砂岩5种。优选法的佐证结果表明,优选的区域(黄金分割区域)恰好也是泥岩——细砂岩系列的11种岩石类型综合聚类为5类的区域,此聚类结果是该系统聚类中的最佳分类。鄂尔多斯盆地东南部长21油层段的开发实践证明,这种岩石类型划分的方法既能满足科研的需要,又方便于生产中应用,是最优选择。
According to the main criteria for the division and nomenclature of terrigenous clastic rocks in China at present, the fine sandstone-mudstone series of terrigenous clastic rocks can be divided into 11 types of rocks. Taking into account the practicality of lithology interpretation in core logging, especially logging detritus and electrical measuring curve, 11 rock types are taken as independent objects and the object set is composed. After data processing and standardization, the cut ratio Chevron distance, cluster analysis. The results show that eleven lithologies of the fine sandstone-mudstone series can be comprehensively classified into five types of mudstone, argillaceous siltstone, siltstone, silty fine sandstone and fine sandstone when the distance coefficient is 0.2564 ~ 0.4231. The corroboration results of the optimization method show that the preferred region (golden section) is also the region where the 11 types of integrated rock-type assemblage of the mudstone-fine sandstone series are classified into 5 categories, and the clustering result is the best classification in the cluster . The practice of Chang 21 reservoir in the southeast part of Ordos Basin proved that this method of rock type classification is the best choice for both scientific research and application in production.