永陇矿区南缘煤岩煤质特征及成煤环境分析
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摘要
永陇矿区位于鄂尔多斯陆相煤盆地边缘地带,目前尚未充分开发,属于大型陆盆边缘矿区,为了探讨该区煤岩煤质与成煤环境的关系,从区内煤岩煤质和地球化学特征入手,详细分析了各煤层镜/惰比、灰分、硫分、酸/碱值等指标,探讨其对成煤环境的指示意义。研究表明:主力煤层属于低灰–中灰、低–特低硫的低阶烟煤;成煤期覆水性、酸/碱值在垂向上有近"S"型下降特征,Ca/Fe值则相反;其中三煤组属小型封闭湖泊相聚煤,二煤组属湖坪河流相聚煤,聚煤作用受控于古地形、古气候及基底不均匀沉降。
The southern edge of Yonglong mining area is a large mining area which has not been fully developed at present, and is located on the edge of Ordos continental coal basin. In order to explore the relationship between coal quality and coal forming environment in large continental basin, starting with the basic data on coal quality, the geochemical data were discussed in detail, and the significance of the indexes such as V/I, ash, sulfur and K value for the coal forming environment was analyzed. The results show that the main coal seam is low rank bituminous coal of "low to medium ash" and "low to extremely low sulfur". The main coal seam is covered with water, and p H has the characteristics of "S" type decline in vertical direction, while Eh is opposite. The third coal group was of small closed lacustrine facies, and the second coal group was of lake flat and river facies. The coal accumulation was controlled by paleotopography, paleoclimate and uneven subsidence.
The southern edge of Yonglong mining area is a large mining area which has not been fully developed at present, and is located on the edge of Ordos continental coal basin. In order to explore the relationship between coal quality and coal forming environment in large continental basin, starting with the basic data on coal quality, the geochemical data were discussed in detail, and the significance of the indexes such as V/I, ash, sulfur and K value for the coal forming environment was analyzed. The results show that the main coal seam is low rank bituminous coal of "low to medium ash" and "low to extremely low sulfur". The main coal seam is covered with water, and p H has the characteristics of "S" type decline in vertical direction, while Eh is opposite. The third coal group was of small closed lacustrine facies, and the second coal group was of lake flat and river facies. The coal accumulation was controlled by paleotopography, paleoclimate and uneven subsidence.
引文
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[3]杨敏芳,鲁静,孙斌,等.盘江地区晚二叠世成煤环境与煤储层特征[J].煤田地质与勘探,2017,45(2),22–26.YANG Minfang,LU Jing,SUN Bin,et al.The coal forming environment and coal reservoir characteristics of Late Permian in Panjiang area[J].Coal Geology&Exploration,2017,45(2),22–26.
[4]TURNER B R,RICHARDSON D.Geological controls on the sulphur content of coal seams in the Northumberland coalfield,northeast England[J].International Journal of Coal Geology,2004,60(2/4):169–196.
[5]王德祖.华亭矿区5号煤层煤相研究[J].中国煤田地质,2005,17(4),6–8.WANG Dezu.A study on No.5 coal seam facies,Huating mining area[J].Coal Geology of China,2005,17(4),6–8.
[6]琚惠姣.平山湖地区7–2层煤煤质特征及其成煤环境意义[J].煤质技术,2015(4),42–44.JU Huijiao.Coal quality characteristic of 7-2 seam in Pingshanhu area and its significance of coal formation environment[J].Goal Quality Technology,2015(4),42–44.
[7]程伟,杨瑞东,崔玉朝,等.贵州毕节地区晚二叠世煤质特征及其成煤环境意义[J].地质学报,2013,87(11),42–44.CHENG Wei,YANG Ruidong,CUI Yuchao,et al.Characteristic of Late Permian coal quality from Bijie,Guizhou Province,SW China,and its significance for paleoenvironment[J].Acta Geologica Sinica,2013,87(11),42–44.
[8]刘善德.陕西永陇矿区某勘查区煤质特征分析[J].煤质技术,2015(5),42–46.LIU Shande.Coal quality characteristics analysis of an exploration area in Yonglong mining area of Shaanxi Province[J].Goal Quality Technology,2015(5),42–46.
[9]吴艳,贾建称,杜志强.煤炭地质勘查中煤层综合对比方法研究—以永陇矿区老爷岭普查区为例[J].中国煤炭地质,2012,24(2),6–10.WU Yan,JIA Jiancheng,DU Zhiqiang.A study on coal seam comprehensive correlation method in coal geological exploration:A case study in Laoyeling prospecting area,Yongshou-Longxian mining area[J].Coal Geology of China,2012,24(2),6–10.
[10]王海军.永陇矿区LYL井田2号煤层顶板沉积环境及其稳定性评价[J].煤田地质与勘探,2016,44(6),38–44.WANG Haijun.Sedimentary environment and stability evaluation of seam roof of No.2 seam in LYL coal mine of Yonglong coal field[J].Coal Geology&Exploration,2016,44(6),38–44.
[11]王双明.鄂尔多斯盆地聚煤规律及煤炭资源评价[M].北京:煤炭工业出版社,1996.
[12]黄文辉,万欢,杜刚,等.内蒙古自治区胜利煤田煤–锗矿床元素地球化学性质研究[J].地学前缘,2008,15(4),56–64.HUANG Wenhui,WAN Huan,DU Gang,et al.Research on elemental geochemical characteristics of coal-Ge deposit in Shengli coalfield,Inner Mongolia,China[J].Earth Science Frontiers,2008,15(4),56–64.
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