第35卷1期2023年1月中国煤炭地质COALGEOLOGYOFCHINAVol.35No.1Jan.2023doi:10.3969/j.issn.1674-1803.2023.01.01文章编号:1674-1803(2023)01-0001-06东胜煤田延安组层序地层学特征及煤相演化主控因素分析沈阳阳,吕大炜∗,张之辉(山东科技大学地球科学与工程学院,山东青岛266590)摘要:运用传统沉积学、层序地层学理论知识,通过野外实地观测和钻井资料分析,对东胜地区延安组进行了层序地层划分。识别出两个三级层序(层序Ⅰ、层序Ⅱ),三个沉积体系域(低位体系域、湖侵体系域、高位体系域)。在延安组识别出两种沉积相———曲流河和湖泊三角洲。同时对延安组的煤层进行显微组分定量统计,研究显示研究区煤相主要为潮湿森林沼泽相。研究区构造稳定,煤相的垂向演化主要受湖平面波动的影响,而湖平面的波动受气候约束,显示气候是煤相演化的主要控制因素。关键词:东胜煤田;延安组;层序地层;显微组分;煤相中图分类号:P618.11文献标识码:AAnalysisonSequenceStratigraphyCharacteristicsandMainControllingFactorsofCoalFaciesEvolutionofYan’anFormation,DongshengCoalfieldSHENYangyang,LYUDawei∗,ZHANGZhihui(CollegeofEarthScienceandEngineering,ShandongUniversityofScienceandTechnology,Qingdao,Shandong266590)Abstract:Basedontheprincipleoftraditionalsedimentologyandsequencestratigraphy,thesequencestratigraphyofYan’anForma-tioninDongshengareaisdivided,throughthecomprehensiveanalysisofthefieldobservationanddrillingdata.Twothird-orderse-quences(sequenceⅠandsequenceⅡ)andthreesystemtracts(lowstandsystemtracts,extended(lacustrine)systemtractsandhighstandsystemtracts)arerecognized.Twosedimentaryfacies,includingmeanderingriverandlacustrinedelta,wereidentifiedintheYan’anFormation.Inaddition,thequantitativestatisticsofmaceralwereintroducedtoidentifythecoalfacesasmoistforestswamp.ThetectonicsettingoftheDongshengareawasstable,andtheverticalevolutionofcoalfaceswasmainlyaffectedbythefluctu-ationoflakelevel,whichwasconstrainedbyclimate.Thus,theclimatewasthemaincontrollingfactorofcoalfacesintheYan’anFormation.Keywords:Dongshengcoalfield;Yan’anFormation;sequencestratigraphy;maceral;coalfacies基金项目:国家自然科学基金项目“华北东部晚石炭—早二叠世煤系沉积记录对全球低纬...
