宁夏延安组煤岩煤质特征及成煤环境研究  

Study on coal lithology and coal quality characteristics and coal forming environment of Yan′an Formation in Ningxia

作　　者：姬晓燕 夏炎 毛兴军 郭伟勇 黄鹏程 Ji Xiaoyan;Xia Yan;Mao Xingjun;Guo Weiyong;Huang Pengcheng(Coal Geology Bureau of Ningxia Hui Autonomous Region,Yinchuan 750002,China)

机构地区：[1]宁夏回族自治区煤炭地质局,宁夏银川750002

出　　处：《能源与环保》2024年第11期96-102,共7页CHINA ENERGY AND ENVIRONMENTAL PROTECTION

基　　金：宁夏重点研发计划项目(2021BEG02015);宁夏2023年自治区财政地质资源勘探专项项目(640000233000000011005);宁夏非常规天然气勘查开发创新团队项目(2022BSB03105);宁夏自然科学基金项目(2023AAC03783)。

摘　　要：中侏罗世延安组是宁夏主要含煤地层之一,主要分布于宁东煤田、宁南煤田、贺兰山煤田汝箕沟矿区和香山煤田下流水、窑山等地,为揭示宁夏延安组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、全硫等地质勘查测试数据,分析了宁夏侏罗纪延安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,贺兰山煤田汝箕沟矿区延安组以半亮型煤、光亮型煤为主,富镜质组,特低灰—低灰,特低硫;宁东和宁南煤田以半暗型煤为主,宁东煤田富惰质组,中高—高挥发分,特低灰—低灰,特低硫—低硫;宁南煤田富镜质组,高挥发分、低灰、低硫—中硫;香山煤田富镜质组,低灰,特低硫—低硫。延安组沉积环境可划分为河流体系和浅湖三角洲体系两大类,其形成经历了冲积平原、浅湖三角洲又复向冲积平原过渡的充填演化过程。研究结果可为宁夏侏罗纪煤清洁高效利用研究提供基础地质数据和理论依据。The Middle Jurassic Yan′an Formation is one of the main coal-bearing strata in Ningxia,mainly distributed in Ningdong Coalfield,Ningnan Coalfield,Rujigou mining area of Helan Mountain Coalfield,Xialiushui and Yaoshan Basin of Xiangshan Coalfield.In order to reveal the characteristics of coal lithology and coal quality and coal-forming environment of Yan′an Formation in Ningxia,based on the geological survey data of coal rock,industrial analysis and total sulfur of coal samples in various recoverable coal seams,the characteristics of Jurassic Yan′an Formation coal in Ningxia were analyzed,and the relationship between ash and sulfur content in coal and sedimentary environment of coal formation was discussed.The results show that the Yan′an Formation in Rujigou mining area of Helan Mountain Coalfield is dominated by semi-bright and bright coal,rich vitrinite,ultra-low to low ash,ultra-low sulfur;Ningdong and Ningnan Coalfields are dominated by semi durain;Ningdong Coalfield is rich in inertinite,medium high to high volatile,ultra-low to low ash,ultra-low to low sulfur;Ningnan Coalfield is rich in vitrinite,high volatile,low ash,low to medium sulfur;Xiangshan Coalfield is rich in vitrinite,low ash,extra low to low sulfur.Generally,the sedimentary environment of Yan′an Formation can be divided into two categories:fluvial system and shallow lake delta system,and its formation has experienced the filling evolution process of alluvial plain,shallow lake delta and then transition to alluvial plain.The results can provide basic geological data and theoretical basis for the study of clean and efficient utilization of Jurassic coal in Ningxia.

关 键 词：宁东煤田 宁南煤田 延安组 煤岩煤质 成煤环境 

分 类 号：P618.11[天文地球—矿床学]