四股泉矿区太原组煤岩煤质特征及成煤环境研究

Study on Lithology and Coal Quality Features and Coal Forming Environment of Taiyuan Formation in Siguquan Mining Area

为揭示四股泉矿区煤岩煤质特征及其成煤环境,基于各可采煤层煤样的煤岩、工业分析、硫分及灰成分等数据,采用煤岩学和地球化学等方法,分析了太原组煤的煤岩煤质特征,探讨了煤中灰分、硫分与成煤沉积环境的关系。研究结果表明:太原组煤变质程度较高,煤类为1/3焦煤。以半亮-半暗煤为主,富镜质组,灰分中等-低,硫分低-中高,以中硫煤为主,低磷-高磷,特低氯-低氯。形态硫数据显示,煤中硫以硫化铁硫为主,有机硫次之,少量硫酸盐硫。煤灰成分以SiO_(2)、Al_(2)O_(3)为主。太原组煤形成于受海水影响作用较大的潟湖相泥炭沼泽环境,垂向上,灰分变化不大,全硫含量自上而下呈增大趋势,聚煤程度呈周期性变化。平面上,北东部较南西部靠近物源区,灰分、硫分高,镜惰比V/I高。研究结果可为焦化用煤研究提供基础地质数据和理论依据。

In order to reveal the characteristics of coal-rock and coal-forming environment in Siguquan mining area,based on the data of coal-rock,industrial analysis,sulfur content and ash composition of coal samples from various minable seams,the coal-rock and coal-quality characteristics of Taiyuan formation coal were analyzed by using the methods of coal petrology and geochemistry,and the relationship between ash content and sulfur content in coal and the coal-forming sedimentary environment was discussed.The results showed that the coal of Taiyuan formation has a high degree of thermal evolution,and the coal species is 1/3 coking coal.It is mainly semi-bright to semi-dark coal,rich vitrinite,medium to low ash,low to medium high sulfur,mainly medium sulfur coal,low phosphorus to high phosphorus,extremely low chlorine to low chlorine.The analysis on the morphological data of the sulfur showed that the sulfur in coal is mainly iron sulfide sulfur,followed by organic sulfur and a small amount of sulfate sulfur.The composition of coal ash is mainly SiO_(2) and Al_(2)O_(3).The coal of Taiyuan formation was formed in the lagoon-facies peat swamp environment under the influence of sea water.The ash content had little change in vertical direction,and the total sulfur content increased from top to bottom.The degree of coal accumulation changes periodically.On the plane,the eastern part of the north is closer to the provenance area than the western part of the south,the ash and sulfur content are higher,and the ratio of V/I is higher.The results can provide basic geological data and theoretical basis for the study of coking coal.