Coal Quality Characteristics And Geological Origin Of Coal Seam In The First Mining Area Of Haerwusu Coal Mine,Inner Mongolia

The Haerwusu coal mine of Coal Seams and Coal Quality Characteristics is the main geological factor that affects current mine mining extraction design.Based on the analysis of regional structural evolution and Coal-bearing deposits environment,conducting systematic statistical analysis of elevation of coal seam floor,coal thickness,coal seam structure and quality parameters such as micro-composition,ash content and sulfur content of the main coal seams.Discussed deeply on coal bed storage feature of vertical and plane in different coal seams,and geological control action of differences from coal quality.The research shows that the coal seam No.5of Shanxi Formation and No.6 complex coal seam of Taiyuan Formation are The main working bed coal seams in the study area,and each coal seam shows the distribution characteristics of"thick in the north and thin in the south,thick in the west and thin in the east,Thin and thick alternate in distribution,and band-like distribution in NNW direction"as a whole.The elevation of seam floor shows the distribution characteristics of"high in the east and low in the west,Z-shaped distribution,anticline into mountains,and syncline into valleys".The NE-directed A2anticline and S1 syncline formed during the Yanshanian period dominated the variation law of strike,inclination and inclination of rock seam.The organic maceral components of No.5,6?and 6IV coal seams are dominated by vitrinite group,while No.6I,6II,6V and 6VI coal seams are dominated byinertinite.The content of inertinite groups in each seam shows a variation tendency of"lower first,then enlargement,and then decrease".The content of inertinite group in the coal is significantly higher than that of Taiyuan Formation coal in the North China coal-ccumulating basin.The distribution of sulfur content and ash content shows the rule of NW strip-shaped interphase development.The sulfur content is significantly lower than that of Taiyuan Formation coal of the North China coal-accumulating basin,the composition of coal ash is mainly Si O₂and Al₂O₃,which belongs to"high silicon aluminum type"coal ash.The morphology of the ancient erosion surface at the top of the Ordovician caused by the Caledonian movement,regional structure like the uplift of the Yimeng uplift in the northern part of the study area and the uplift of the Yinshan orogenic belt in the northern margin of the basin and so on control the paleogeomorphology,coastline location and sedimentary pattern.Later structural reconstruction mainly caused the weak fold bending deformation of the coal seam and the corresponding changes in the elevation of floor and burial depth of the seams.Due to the whole construct deformation is weak,the later structural reformation did not cause by significant changes in coal thickness,coal seam structure and coal quality of the coal seam.A very thick peat layer was aggregated under Waterfront Shallwo Sea Tide Flat-Lagoon Barrier system in the Taiyuan period and widely developed huge thick seam No.6 in the whole area.Due to the active detrital system in the Shanxi period,which is not conducive to the formation and development of peat swamps,coal aggregated has weakened.The vitrinite groups content of seam No.6 is relatively low,reflecting the relatively dry coal formation period,which is mainly formed in relatively dry and weak water-covered forest marshes environment,seam No.5 is formed in a shallow cloak water forest swamp environment.The covering water in the region is deepened from thebasin margin to inner basin,the reduction is strengthened,and the gelation is strengthened,which increases the content of the vitreous groups and decreases the inert groups.This paper has 45 pictures,8 tables,84 reference articles.