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用沉积地质学的研究方法对内蒙古乌达矿区晚古生代太原组１５号煤层下含煤岩系的岩石学特征、沉积层序和展布格局进行了详细研究，认为１５号煤层堆积于潮下砂坪沉积环境．对煤层本身的分布和煤岩学、煤质特征研究结果表明，该煤层的厚度分布稳定，与正常海相形成的煤相比该煤层中硫分偏低，惰性组分和矿物含量高，活性组分较低，并含有火山灰夹矸．因此可以推测，１５号煤层是在一种剧烈的地壳抬升作用下，由于海水迅速退出本区使潮下砂坪沼泽化而形成的．
Using the method of sedimentary geology, the petrological characteristics, sedimentary sequence and distribution pattern of the coal measures of late Paleozoic Taiyuan Formation No. 15 in Wuda, Inner Mongolia have been studied in detail. It is concluded that the No.15 coal seam accumulates in the sand Ping sedimentary environment. The study on the distribution of coal seams and the characteristics of coal petrology and coal shows that the thickness distribution of the coal seams is stable. Compared with the normal marine coal, the coal seams have lower sulfur content, higher inert components and mineral content, higher activity Lower component, and contains volcanic ash clip gangue. Therefore, it can be speculated that coal seam 15 was formed under the action of a violent crustal uplift due to the rapid withdrawal of seawater from this area to swamp the tidal flat.