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ID:18452489
大小:13.16 MB
页数:9页
时间:2018-09-18
《武威盆地石炭系层序地层学研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、第24卷第6期现代地质Vol24No62010年12月GEOSCIENCEDec2010武威盆地石炭系层序地层学研究112131李儒峰,柳广弟,马国富,高岗,方晶,刘玉娥(1中国石油大学地球科学学院,北京102249;2中国石油天然气股份有限公司玉门油田分公司,甘肃玉门735200;3天津师范大学城市与环境科学学院,天津300386)摘要:首次对武威盆地13条石炭系露头剖面进行了层序地层研究,识别出2个Ⅰ类层序界面和4个Ⅱ类层序界面、5
2、个层序和11个体系域,其中,Ⅰ型层序界面具有由区域性构造运动形成的构造不整合和由局部升降运动导致的剥蚀或地层缺失2种成因类型,Ⅱ型层序界面主要为沉积结构发生明显改变的结构类型的转换界面。层序Ⅰ、层序Ⅱ、层序Ⅲ、层序Ⅳ、层序Ⅴ基本与前黑山组、臭牛沟组、靖远组、羊虎沟组、太原组相吻合。首次在早石炭世前黑山组底部判识出了由下切河道相进积复合体构成的低水位体系域,揭示不同层序内各体系域发育特征,并以体系域为等时地层对比单元进行追踪对比,建立了武威盆地石炭系层序地层格架,分析了层序和体系域演化特征及其所反映的沉积环境变化规律。关键词:石炭系;层序;
3、体系域;层序地层格架;武威盆地中图分类号:P53445文献标志码:A文章编号:1000-8527(2010)06-1048-09SequenceStratigraphicAnalysisofCarboniferousinWuweiBasin112131LIRufeng,LIUGuangdi,MAGuofu,GAOGang,FANGJing,LIUYue(1CollegeofGeosciences,ChinaUniversityofPetroleum,Beijing102249;2YumenOilfield,CNPC,Yume
4、n,Gansu735200;3CollegeofUrbanandEnvironmentScience,TianjinNormalUniversity,Tianjin300386)Abstract:Asystematicstudyonsequencestratigraphyof13CarboniferousoutcropsectionsinWuweiBasinhadbeenconductedtoidentifytwotypeⅠsequenceboundaries,fourtypeⅡsequenceboundaries,fiveseque
5、ncesand11systemstracts.TypeⅠsequenceboundaryhadtwogenetictypes.Onegenetictypewasthetectonicunconformityinterfaceinfluencedbytheregionaltectonicmovements,theothergenetictypewastheerosionorsequencemissinginfluencedbythelocalliftdownmovements.ThetypeⅡsequenceboundarywasma
6、inlythestructuretransitioninterfacebythesignificantchangeinthesedimentarystructure.ThesequenceⅠ,sequenceⅡ,sequenceⅢ,sequenceⅣ,sequenceⅤwerebasicallymatchedwithQianheishanFormation,ChouniugouFormation,JingyuanFormation,YanghugouFormationandTaiyuanFormation.Forthefirsttime,
7、thelowstandsystemscomposedbydowncuttingstreamphasecomplexhadbeendiscriminatedinthebottomofQianheishanFormationoftheEarlyCarboniferous.WerevealedthedevelopmentcharacteristicsofdifferentsystemstractswithinthesequenceandsetupthesequencestratigraphicframeworkofCarboniferous
8、inWuweiBasin,analyzedtheevolutionofsequenceandsystemstractsandthechangelawofsedimentaryenvironm
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