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坦桑尼亚桑威—基畏那煤田依沃古区,有三层可采煤层,即3b煤层,5煤层和6煤层,均属低变质程度的烟煤。3b煤层镜质组含量较高,5煤层和6煤层镜质组含量低,而丝质组和半丝质组含量高,因而在化学工艺性质和工业利用方向上与3b煤层有所不同。该区煤层的夹矸多,煤中丝质组含量高,菌核体多,煤岩组分比较破碎,反映一种水介质活动性强、氧气比较充足的沉积环境。该区的煤质,除受变质程度控制外,还决定于煤岩组成的情况。
There are three layers of recoverable coal seams in the Sunway-Cristoforojeum, Iowa, which are 3b coal seam, 5 coal seam and 6 coal seam, all of which are low-grade bituminous coal. 3b coal seam vitrinite content is higher, 5 coal seam and 6 coal seam vitrinite content is low, while the silk group and semi-siliceous group of high content, and thus in the chemical process properties and industrial use direction and 3b coal seam is different. There are many gangue seams in this area, such as high silt content in coal, many sclerotia, and relatively broken components of coal and rock, reflecting a sedimentary environment with strong activity and abundant oxygen. The quality of coal in the area, except by the metamorphism control, also decided on the composition of coal and rock.