Analysis of coal formation environment in the south of Huoxi Coalfield based on coal quality characteristics
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摘要: 霍西煤田是我国重要的焦煤产地，为了全面查明其煤质特征及成煤环境，本文以煤田南部的主采煤层（2、9（9+10）号）为研究对象，通过分析煤样的煤岩、硫分、灰分和灰成分等数据，评价其煤质特征，推断其成煤环境。研究表明：煤层镜惰比越高，沉积环境覆水越深；硫分含量越高，受海水影响越大；灰分含量越高，水动力越强；灰成分指数K值越大，还原型越强；CaO/MgO值越高，则成煤气候条件越潮湿；m值反映沉积环境是淡水还是咸水。根据2、9（9+10）号煤灰分低-中、灰成分指数低、1< m< 10的特点，推断二者形成过程受河流搬运作用影响，为水动力较强、还原型、半咸水的沉积环境。对2 层煤其他煤质特征分析，发现二者成煤环境存在差异，表现为：2 号煤具有镜惰比（V/I）较低、硫分低、CaO/MgO 值较高的特征，说明成煤环境为覆水不深、古气候环境潮湿的三角洲平原相泥炭沼泽环境；9（9+10）号煤具有镜惰比（V/I）中等偏高、硫分高、CaO/MgO值高的特征，说明成煤环境为强覆水、受海水影响、古气候环境极潮湿的泻湖相泥炭沼泽环境。Abstract: The Huoxi coalfield is an important coking coal producing area in China. In order to fully identify its coal quality characteristics and coal-forming environment, this paper chooses No.2 and 9 (9+10) coal seams which are representative in southern coalfield to research. By analyzing the data of coal rock, sulfur content, ash content and ash composition of coal samples, the coal quality characteristics were evaluated and the coal forming environment was inferred.The results show that the higher the mirror laziness ratio of coal seam is, the deeper the sedimentary environment is covered by water. The higher the sulfur content is, the more affected by sea water; The higher the ash content is, the stronger the hydrodynamic force is.The larger the grey component index K is, the stronger the reduction is. The higher the CaO/MgO value is, the wetter the coal-forming climate is. The m value reflects whether the sedimentary environment is fresh or salt water.According to the characteristics of No.2 and No.9(9+10)coal ash with low to medium and low ash composition index and 1< m< 10, it is inferred that their formation process was influenced by river transport, and they were depositional environments with strong hydrodynamics, reduced form and brackish water. By analyzing other coal quality characteristics of the two coal layers, it is found that there are differences in the coal-forming environment between the two coal layers, as follows:No.2 coal has the characteristics of low vitreous inert ratio(V/I), low sulfur content and high CaO/MgO value, indicating that the coal-forming environment is a deltaic plain peat swamp environment with low overlying water and humid paleoclimate environment. No. 9 (9+10) coal has the characteristics of moderately high mirror inert ratio(V/I), high sulfur content and high CaO/MgO value, indicating that the coal formation environment is a lagoon peat swamp environment with strong water cover, seawater influence and extremely humid paleoclimate environment.
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