库车坳陷北部构造带克孜勒努尔组煤层煤岩学特征及煤相约束作用  

Coal petrography characteristics and coal facies constraints of Kezilenur Formation coal seams in the northern tectonic belt of Kuqa Depression

作　　者：李玲 唐淑玲[4] 王斌 汤达桢[4] 赵天天 支元昊 谢亚妮 申林 刘团飞 LI Ling;TANG Shuling;WANG Bin;TANG Dazhen;ZHAO Tiantian;ZHI Yuanhao;XIE Yani;SHEN Lin;LIU Tuanfei(R&D Center for Ultra-Deep Complex Reservoir Exploration and Development,CNPC,Korla 841000,China;Engineering Research Center for Ultradeep Complex Reservoir Exploration and Development,Xinjiang Uygur Autonomous Region,Korla 841000,China;Xinjiang Key Laboratory of Ultra-deep Oil and Gas,Korla 841000,China;School of Energy Resources,China University of Geosciences-Beijing,Beijing 100083,China)

机构地区：[1]中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心,新疆库尔勒841000 [2]新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒841000 [3]新疆超深油气重点实验室,新疆库尔勒841000 [4]中国地质大学(北京)能源学院,北京100083

出　　处：《煤炭科学技术》2025年第3期124-138,共15页Coal Science and Technology

基　　金：中国石油天然气集团有限公司科技资助项目(2023ZZ14YJ02,2022KT0201)。

摘　　要：塔里木盆地库车坳陷北部构造带侏罗系煤层广泛发育,近年来的勘探开发实践表明该区煤层气资源勘探潜力巨大,有望成为天然气增储上产重要保障。通过宏观煤岩观测、显微煤岩组分、工业分析及元素地球化学分析,查明了库车坳陷北部构造带侏罗系克孜勒努尔组煤岩煤质发育特征,判识了煤相类型,并揭示了煤相对煤岩煤质的约束作用。结果表明:侏罗系克孜勒努尔组煤具有中高镜质组、特低水分、低中灰分、中高挥发分、中等固定碳的特征,上部0号、2号、3号煤层的煤岩煤质发育较好,1号煤非均质性较强。煤中矿物质来源以陆源碎屑为主、内源碎屑为辅,煤层主要形成于弱氧化−弱还原和还原环境,仅YT1H井部分1号和5号煤层形成时处于偏氧化环境。克孜勒努尔组煤相可划分为4种类型,从陆到湖煤相呈潮湿森林沼泽相、较浅覆水森林沼泽相、湿地草木混生沼泽相、低位草本沼泽相有序分布。YT1H井成煤植物为木本植物,沼泽覆水深度变化大,潮湿、较浅覆水森林沼泽相交替出现;DT1井成煤植物以水生草本植物为主,覆水程度大,水体滞留性强,为富营养型的低位草本沼泽相;MQ1井成煤植物为草本植物为主,木本植物为辅的草木混生型,煤相为湿地草木混生沼泽相,覆水程度中等,为中富营养型沼泽。煤岩煤质发育特征受到成煤沼泽位置、覆水深度、成煤植物类型、水动力条件的耦合约束作用,覆水程度高,还原性强,水体流动性弱的低位草本沼泽相和较浅覆水森林沼泽相为研究区最有利煤相类型,可作为优势煤岩发育区带优选依据。Jurassic coal seams are widely developed in the northern tectonic belt of Kuqa Depression,Tarim Basin.Exploration and development practices in recent years show that the exploration potential of coalbed methane(CBM)resources in this area is huge,and it is expected to become an important guarantee for increasing natural gas reserves and production.Through macroscopic observation and microscopic coal composition,industrial analysis,and elemental geochemical analysis,the coal petrography and coal quality characteristics of the Jurassic Kezilenur Formation in the northern tectonic belt of the Kuqa Depression were identified.The coal facies types was identified,and the constraining effect of coal facies on coal petrography and coal quality was revealed.The research results indicate that the coal of the Jurassic Kezilenur Formation has the characteristics of medium-high vitrinite content,low minerals,ultra-low moisture,low-medium ash,medium-high volatile matter,and medium fixed carbon.Vertically,the coal petrography and coal quality of the upper No.0,No.2,and No.3 coal seams are well developed,while No.1 coal seam has strong heterogeneity.The mineral sources in coal are mainly terrestrial debris,supplemented by endogenous debris,and most coal seams were formed in weak oxidation-weak reducing and reducing environments,with only parts of No.1 and No.5 coal seams in the YT1H well formed in an oxidizing environment.The coal facies of the Kezilenur Formation are divided into four types,from land to lake,the coal facies are orderly distributed in the form of wet forest swamp facies,shallow water-covered forest swamp facies,wetland mixed vegetation marsh facies and low position herbaceous marsh facies.The coalforming plants in YT1H well are woody plants,and the depth of water-covered of swamp changes greatly,and the wet and shallow watercovered forest swamp facies appear alternately.The coal-forming plants in DT1 well are mainly aquatic herbaceous plants,which have large water-covered depth and strong water retention,and the

关 键 词：库车坳陷 侏罗系 煤岩煤质 煤相 约束作用 

分 类 号：TD11[矿业工程—矿山地质测量]