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对鄂尔多斯盆地东胜—神木地区侏罗系直罗组和延安组的9个煤样进行了工业分析和元素分析以及煤灰常量元素测试分析,探讨了成煤环境条件对煤样性质的影响,并揭示了不同聚煤体系煤灰中常量元素的特征及其控制因素。分析测试结果显示,直罗组和延安组不同聚煤体系中煤的灰分产率、矿物含量和有机C含量呈现明显的变化趋势,从延安组Ⅱ、Ⅲ、Ⅳ单元→延安组Ⅴ单元→直罗组,煤矿物含量和灰分产率增加、有机C含量降低。此外,直罗组和延安组不同聚煤体系煤灰样的常量元素特征也具有明显的差异性和一定的变化规律,如:从延安组Ⅱ、Ⅲ、Ⅳ单元→延安组Ⅴ单元→直罗组,煤灰样中SiO2含量增加;延安组煤灰样K2O含量明显低于直罗组煤灰样K2O含量;此外,延安组Ⅱ、Ⅲ、Ⅳ单元煤灰样中TFe2O3含量远高于延安组Ⅴ单元和直罗组。综合研究认为,延安组Ⅱ、Ⅲ、Ⅳ单元、延安组Ⅴ单元和直罗组煤层煤的灰分产率、矿物含量和有机C含量的差异主要受控于成煤环境条件。成煤过程中所处的沼泽环境受河流所携带的碎屑物质影响的程度,影响着煤的矿物含量、灰分产率和有机C含量等特征。而延安组Ⅱ、Ⅲ、Ⅳ单元、延安组Ⅴ单元和直罗组不同聚煤体系的煤灰常量元素特征及其差异性,则主要受成煤环境条件(陆源碎屑矿物的量)、环境气候条件和有机质的量等因素的控制。
Nine coal samples from Zhiluo and Yan’an formations of Jurassic in Dongsheng-Shenmu area, Ordos Basin, were analyzed by industrial analysis, elemental analysis and elemental analysis of fly ash. The effects of coal-forming environmental conditions on the properties of coal samples were discussed. And reveals the characteristics and the controlling factors of the major elements in the coal ash of different coal accumulation systems. Analytical test results show that the ash production rate, mineral content and organic C content of coal in different coal accumulation systems of Zhiluo and Yan’an show obvious trend of change. From Unit ¢ ò, ¢ ó and ¢ ñ of Yan’an Formation → Unit ¢ ñ of Yan’an Formation Luo group, coal content and ash yield increased, organic C content decreased. In addition, there are obvious differences and certain regularities of the variation of the major elements of coal-ash-like samples in Zhiluo and Yan’an formations, such as from Unit Ⅱ, Ⅲ and Ⅳ of Yan’an Formation → Unit Ⅴ of Yan’an Formation → Zhiluo In the Yan’an group, the content of K 2 O in coal ash was significantly lower than that in Zhiluo Formation. In addition, the content of TFe 2 O in coal ash samples of units II, III and IV of Yan’an Formation was much higher than that of Yan’an Formation Ⅴ unit and Zhiluo group. According to the comprehensive study, the differences of ash production rate, mineral content and organic C content of coal in units Ⅱ, Ⅲ, Ⅳ of Yan’an Formation, unit Ⅴ of Yan’an Formation and Zhiluo Formation are mainly controlled by the environmental conditions of coal formation. The degree of marsh environment in the process of coal formation affected by the debris carried by rivers affects the characteristics of coal mineral content, ash yield and organic C content. However, the characteristics and differences of the coal-ash elements in different coal accumulation systems of units Ⅱ, Ⅲ and Ⅳ of Yan’an Formation, units of Ⅴ of Yan’an Formation and Zhiluo Formation are mainly affected by the coal-forming environmental conditions (terrigenous detrital minerals), environment Climate conditions and the amount of organic matter and other factors.