Analysis of occurrence characteristics and main controlling factors of tar-rich coal in Dananhu mining area in Turpan-Hami Basin
In order to reveal the occurrence characteristics and thier main controlling factors of tar-rich coal in Dananhu mining area in Turpan-Hami Basin,taking No.3,No.7 and No.25 coal seams as research objects,the occurrence characteristics of tar-rich coal in Dananhu mining area were studied by analyzing the characteristics of coal,rock and coal quality and tar yield.The main factors affecting the occurrence of tar-rich coal in Dananhu mining area were studied in combination with the composition of microscopic coal,H/C atomic ratio,vitrine ratio and ash composition and so on.The results show that the coal from No.3,No.7 and No.25 coal seams in Dananhu mining area is dominated by vitrinite,which generally belongs to medium-moisture,ultra-low-low ash,high-volatile coal;the tar-rich coal resources of each coal seam are scattered in the edge of the mining area;coal tar yield is positively correlated with vitrinite content,exinite content,hydrogen content,H/C atomic ratio,ash component index,and negatively correlated with inertinite content.The formation and occurrence of tar-rich coal are more favorable under the conditions of wet,water-covered reduction environment and lower coalification degree.
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