Characteristics of coal petrography and quality and the coal forming environment in the south edge of Yonglong mining area
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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。Abstract: 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 pH 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.
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