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鄂尔多斯盆地奥陶系可分为两个地层分区,即中东部地层分区和西部地层分区。两个分区奥陶系的划分和对比,是一个长期未决的问题。本次工作在露头剖面的古生物组合及岩性特征分析的基础上,结合钻井剖面的岩石古生物特征和测井曲线特征,将鄂尔多斯盆地东、西部的奥陶系进行了划分和对比:中东部分区奥陶系划分方案与华北地台的基本一致;中东部及西部的下奥陶统均可划分为冶里组和亮甲山组;西部的三道坎组相当于中东部的马家沟一组,桌子山组相当于马家沟二组和马家沟三组,克里木里组相当于马家沟四组、马家沟五组和马家沟六组,乌拉力克组相当于平凉组下部。
The Ordovician Ordovician Basin can be divided into two stratigraphic subdivisions, that is, the middle and eastern stratigraphic division and the western stratigraphic division. The division and contrast of Ordovician between the two divisions is a long-standing issue. Based on the analysis of paleontological assemblages and lithology in outcrop profile, this work combines the paleobiospecies of rock drilling and the characteristics of well logging curves to divide and contrast the Ordovician in the east and west of the Ordos Basin: The Ordovician division scheme is basically the same as that of the North China Platform; the Lower Ordovician in the middle and eastern parts of the country can be divided into the Yeli Group and the Liangjishan Formation; the third Daodaan Formation in the west is equivalent to the Majiagou Group in the middle and eastern part , Table Mountain Group is equivalent to Majiagou two groups and Majiagou three groups, the Kerimuli group is equivalent to Majiagou four groups, Majiagou five groups and Majiagou six groups, Uralik group is equivalent to Pingliang group Lower part.