内蒙古乌达矿区煤的显微特征与沉积环境关系的研究

The Study on the Relationship Between the Petrology Micro characteristics and Depositional Environment of Coal in Wuda Coal Field in Inner Mongolia

通过对研究区主采煤层显微特征和沉积环境的分析，并利用三角图解（在三角图解中，考虑了煤中矿物特别是自生矿物对指示煤相的意义）和组分含量平面图，论述了显微煤岩特征与沉积环境的关系。研究发现，潮控下三角洲平原形成的煤层其活性组分和硫分含量较之河控下三角洲平原含量高，并且三角图解三端元的离散率小；在潮坪沉积基础上形成的煤层其惰性组分含量高并分布稳定；相同沉积环境形成的不同煤层显微组成相似，但它们的显微组成由于聚煤环境的变迁而在平面分布上有差异。

According to the analysis of micro characteristics and depositional environment of the main exploited coals, and using the triangular diagram (In the diagram, the significance to indicate coal facies of the minerals in coal, especially authigenic ones, has been taken into consideration) and the map of maceral, the authors have found that there is a higher active component and sulfur content in tide dominated delta plain than that in river dominated delta plain, and the divergence in the triangular is small. Besides, the inert component in the coal formed on the tidal flat is high and its distribution is stable, and there is a likeness between different coals formed in the same depositional environment. But there is a difference of microcomposition on the plane because of the various environment.