新疆巴里坤煤矿区构造特征及煤变质规律探讨

Discussion on Structural Features and Coal Quality Changing Pattern in Barkol Coalmine Area,Xinjiang

巴里坤煤矿区位于北塔山褶皱系东部的凹陷内,受控于北西、北北西断裂,区内4个中生代凹陷盆地呈北西向雁行相间排列,矿区煤炭资源丰富,煤质好。由上至下,煤化程度逐渐增高;平面上由西至东,煤化程度亦逐渐增高,由低变质的长焰煤逐步变质为气煤和1/3焦煤。在深成变质作用的影响下,叠加了动力变质作用,致使相同聚煤环境下的同一煤系地层中的各煤层的变质程度不同。在应力集中的区域,动力变质作用的叠加效果明显,形成特殊煤种,如石炭窑的1/3焦煤,此项研究为寻找特殊煤种提供了地质依据。

The Barkol coalmine area is situated in a depression of the eastern Baytik fold system.It is controlled by NW and NNW faults,4 Mesozoic depressed basins present NW en echelon arrangement.The coalmine area has abundant coal resources,with good coal quality.From top to bottom,degree of coalification is increasing;in plane view,increasing from west to east,degree of coalificatin is also increasing,from low metamorphic long flame coal gradually degenerated gas coal and 1/3 loking coal.Besides the basic influence from hypozonal metamorphism has also stacked with dynamic metamorphism,resulted in each coal seam has different degree of metamorphism,no matter in a same coal measures strata and same coal-accumulation environment.But coal quality variation still has rules to follow,in stress concentrated areas,dynamic metamorphism stacking effect is obvious and may form special coal ranks,such as 1/3 coking coal in Shitanyao area.Thus the study has provided geological basis for special ranked coal seeking.