鄂尔多斯盆地东南部长21油层段储层岩石类型聚类分析

Reservoir rock type cluster analysis of Chang_2~1 oil and gas-bearing member,south-east of Ordos Basin

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。

Based on the main criteria of terrigenous clastic rock classification and nomenclature at present in China, the clastic fine sandstone-mudstone may be divided into 11 types. Taking core logging into account, especially rock fragment logging and practical lithologic logging interpretation in work, we regard 11 rock type as respective independent object, and formed the object collection, then, after the data treatment and standardization, we count the Chebyshev's distance and implement the cluster analysis, which indicates that, when 0. 256 4<λ<0. 4231,the 11 rock type of series of fine sandstone-mudstone can be generalized as 5 rock types: mudstone, muddy siltstone, siltstone, silty fine sandstone, fine sandstone. The filed practice of Chang21 oil and gas-bearing member in the south-east of Ordos Basin has proved that the method for rock type classification can both meet the needs of scientific research and field application, it is the optimum selection.