【作者】 陈韵；

【导师】 周安朝；

【作者基本信息】 太原理工大学 ， 矿产普查与勘探， 2014， 硕士

【摘要】 宁武煤田位于山西省中北部宁武至静乐一带,煤炭资源以石炭二叠纪煤为主,仅在煤田中部赋存有少量侏罗纪煤。宁武煤田含煤沉积体系由三角洲体系、弱障壁泻湖沉积体系及河流体系构成一总体以海退为主的沉积序列。以往学者对宁武煤田的研究主要集中在煤田中部的侏罗系煤层、平朔矿区及朔南矿区的煤层赋存特征及含煤建造分析等,很少有人系统的研究宁武煤田石炭二叠纪煤的煤岩学和煤地球化学特征。本文根据煤田地质学、煤地球化学、煤岩学等理论知识,通过对宁武煤田区域地质野外踏勘、文献搜集与阅读、地质报告数据解析,石炭二叠纪煤层样品井下取样、室内样品磨制、显微镜下样品鉴定,整理并分析了煤田内石炭二叠纪主采煤层的煤地球化学及微量元素的数据,进一步探讨了宁武煤田石炭二叠纪主采2、5号煤的煤质特征、煤岩学特征和煤地球化学特征,为石炭二叠纪煤的开采和利用提供一定的理论依据。本文得出的主要结论如下:1、宁武煤田太原组2号煤层镜质组平均反射率为0.81%,5号煤为0.84%,煤类主要为气肥煤,变质阶段属烟煤Ⅰ阶段。2、宁武煤田石炭二叠纪主采煤层2号原煤为低水分、中灰煤、高挥发分、中硫煤。5号原煤为低水分煤、中灰煤、中高挥发分煤、中高硫煤。宁武煤田灰分和挥发分产率变化趋势为北高南低,5号煤较2号煤高;全硫含量变化趋势为北中部较南部高,5号煤较2号煤高。3、研究区太原组2号煤宏观煤岩组分以暗煤为主,其次为亮煤,镜煤以条带状、线理状结构为主;宏观煤岩类型以暗淡型为主,其次为半暗型、半亮型。5号煤宏观煤岩组分以亮煤为主,暗煤次之,夹镜煤条带以及含少量黄铁矿结核;宏观煤岩类型以半暗型为主,其次为暗淡型、半亮型,含少量夹矸。4、研究区2号煤层镜质组平均体积分数为71.2.%,惰质组平均体积分数为12.48%,壳质组平均体积分数为3.25%,显微煤岩类型包括微镜惰煤V和微三合煤V。5号煤镜质组平均体积分数为68.8%,惰质组平均体积分数为11.08%,壳质组平均体积分数为4.74%,显微煤岩类型包括微镜惰煤V和微三合煤V。2号煤和5号煤的原始成煤泥炭沼泽相均为覆水森林沼泽相和较深覆水森林沼泽相。5、2号煤中,As含量在2-6μg/g之间,5号煤中,As含量在0.8-2μg/g之间,2、5号煤中的As含量均小于8μg/g,对煤的利用不会产生影响。2号煤中,Ga含量在20-30μg/g之间,5号煤中,Ga含量在6-16.75μg/g之间,2号煤Ga含量超过20μg/g,可能会有一定的利用价值。2号煤中,Th含量在9-14μg/g之间,5号煤中,Th含量在4-12μg/之间。2号煤中,V含量在20-32μg/g之间。5号煤中V含量在10.75-17.4μg/g之间。2号煤中,Cl含量在0.019-0.059%之间,5号煤中,C1含量在0.05-0.4%之间,部分超过了0.3%,用于燃烧,产生严重的腐蚀。2号煤中,F含量在66-196μg/g之间。5号煤中,F含量在71-111μg/g之间。2号煤中,P含量在0.008-0.016%之间,5号煤中,P含量在0.006-0.0146%之间,2、5号煤中P含量远小于0.1%,炼焦用煤不会产生影响。更多还原

【Abstract】 Ningwu coal field is ocated in the north central part of Shanxi province coalfield Ningwu to Jingle area,Coal resources Carboniferous Permian coal is Major Coal resources,A small amount of Jurassic coal consist in the middle of coalfield.Ningwu coalfield coal depositional system sementary is predominantly a general regression sequence dominated by delta system and weak barrier lagoon depositional system and fluvial system.Previousscholars mainly concentrated in the Middle Jurassic coal seam,Coal seam characteristics and coal bearing formation analysis of Pingshuo coal mining and Shuonan mining area.Few people Systematic studied coal petrology and coalgeochemistry of Carboniferous Permian coal from Ningwu coalfield.On the basis of coal geology,coal geochemistry,coal petrologytheory,Through the Ningwu coalfield regional geological field survey,literature collection and reading,geological report data analysis,the coal samples of Permian Carboniferous coal seam,through the well sampling and indoor sample grinding,microscopic identification of some samples,Collect and analysis the coal geochemistry and data of trace elements of main coal seam from Carboniferous Permian from Ningwu coalfield data,Further study coal petrology,coal geochemistry and quality characteristics of No.2 coal and No.5 coal from Carboniferous Permian from Ningwu coalfield,in order to provide Certain theoretical basis for the Carboniferous Permian coal mining and utilization.1.The average vitrinite reflectance of No.2 coal is 0.81%,and that of reflectance of No.5 coal is 0.84%,the coal type mainly is gas-fat coal and belong to first metamorphic stages of bituminite.2.The coal qualities of No.2 are low moisture,high ash and volatilize medium sulfur coal.The coal quality of No.5 is low moisture,medium ash,high volatilize and medium-high sulfur coal.Ningwu coal ash and volatile matter change tendency for the north south high low.No.5 coal is higher than that of No.2 coal.The tendency of total sulfur content is relatively high in North low in South.No.5 coal is higher than that of No.2 coal.3The macro-petrology macerals of No.2 coal mainly is durian,secondly is vitrain and clarain.Banded,lineation structure obviously is in the presence of vitrain.The macro-petrology type of No.2 coal mainly is dull coal,semi-light and semi-dull coal is secondary.The macro-petrology macerals of No.5 coal mainly is clarain,secondly is durian with theVitrain bands and Pyrite nodules.The macro-petrology type of No.2 coal mainly is semidull coal,semi-light and coal semidull is secondary.Containing a small amount of gangue.4.The average volume percentage of vitrinite for No.2 coal is 71.2%,inertinite is 12.48%and exinite is 3.25%.T he average volume percentage of vitrinite for No.5 coal is 68.8%,inertinite is 11.08%and exinite is 4.74%.The microlithotype of No.5 coal is vitrinertite V,trimacerite V.The microlithotype of No.5 coal is vitrinertite V,trimacerite V.No.2 and No.5 coal raw coal forming peat swamp facies arecovered water forest swamp and relatively deep water coveredswamp forest.5.No.2 Coal,Content of As is 2-6μg/g,No.5 Coal,Content of As is 0.8-2μg/g,Content of As of No.2 Coal and No.5 Coal is lower than 8μg/g,will not affect use of coal.No.2 Coal,content of Ga is 20-30μg/g,No.5 Coal,content of Ga is 6-16.75μg/g,No.2 Coal,content of Ga is more than 20μg/g.This may be some use value.No.2 Coal,content of Th is 9-14μg/g,No.5 Coal,content of Th is 4-12μg.No.2 Coal,content of V is 20-32μg/g,No.5 Coal,content of V is 10.75-17.4μg/g.No.2 Coal,content of Cl is 0.019-0.059%,No.5 Coal,content of Cl is 0.05-0.4%,partly more than 0.3%,will produce serious corrosion.No.2Coal,content of F is 66-196μg/g,No.5 Coal,content of F is 71-11μg/g.No.2 Coal,content of P is 0.008-0.016%,No.5 Coal,content of P is 0.006-0.0146%,content of P is far less than 0.1%,will not affect coking coal.更多还原