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时间:2020-01-13
《北部湾盆地迈陈凹陷东部构造物理模拟研究.pdf》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36卷第4期石油察毖弛届Vo1.36.No.42014年7月PETRoLEUMGEoL0GY&EXPERIMENTJu1.,2014文章编号:1001-6112f2014)04—0516—07doi:10.11781/sysydz201404516北部湾盆地迈陈凹陷东部构造物理模拟研究陈长征,陈伟,吴峰,成为,周进峰(中国石化江苏油田分公司地质科学研究院,江苏扬州225009)摘要:北部湾盆地迈陈凹陷断裂系统十分复杂,为了明确其成因机制,在三维地震资料构造解析的基础上,应用砂箱模拟实验,对迈陈凹陷东部断裂系统形成进行分析。结果表明,迈陈凹陷东部可划分为上、下2套断裂系统,下部断
2、裂系统是受长流一流沙港期NW—SE向区域拉张应力形成,上部断裂系统是受涸洲期NW—SE向区域拉张及右旋走滑应力形成。并且下部断裂体系受基底先存断裂影响较大,走向、倾向、断层组合都与其保持一致;上部断裂体系受基底断层影响较小,多为新生型断层或继承改造型断层。涠洲期走滑程度的强弱直接影响断裂发育的走向,弱走滑条件下实验结果与实际地质特征吻合度高,并且发育的次级小断层有利构造圈闭的形成.对三维地震构造精细解释有指导作用。关键词:构造物理模拟;断裂体系;成因机制;迈陈凹陷;北部湾盆地中图分类号:TEl21.2文献标识码:AStructuralphysicalsimulationresea
3、rchofeasternMaichenSag,BeibuwanBasinChenChangzheng,ChenWei,WuFeng,ChengWei,ZhouJinfeng(GeologicalScientifcResearchInstituteofSINOPECJiangsuOilfieldCompany,Yangzhou,Jiangsu225009,China)Abstract:ThefaultsystemoftheMaichenSagintheBeibuwanBasinisverycomplex.Inordertorevealitsge—neticmechanism,san
4、dboxmodellingtechnologieswereappliedinthispapertomakeasystemicanalysisontheformationmechanismoftheeasternfaultsystembasedonthestructuralanalysisof3Dseismicdata.TheresultsshowthatthefaultsintheMaichenSagcanbedividedintotheupperandthelowerfaultsystems.ThelowerfaultsystemwasformedbytheNW-SEorien
5、tedregionaltensilestressduringtheChangliuandLiushagangperiods,andtheupperfaultsystemwasformedbytheNW——SEorientedregionaltensilestressandright—lateralstrike。slipstressduringtheWeizhouperiod.Thelowerfaultsystemwasgreatlyinfluencedbybasementfaults,andtheirdi—rection,orientationandfaultcombinatio
6、nwereconsistent.Theupperfaultsystemwaslessaffectedbybasementfaults,whichwasmainlynewfaultsorinheritedtransformfaults.Faultdirectionwasdirectlyaffectedbystrike—slipdegreeduringtheWeizhouperiod.Theexperimentalresultsundertheconditionofweakstrike—sliparecon—sistentwiththeactualgeologicalcharacte
7、ristics,andthedevelopmentofsecondaryfaultsisconducivetothefor-marionofstructuraltraps,whichplayaguidingrolein3Dseismicfinestructureinterpretation.Keywords:structuralphysicalsimulation;faultsystem;formationmechanism;MaichenSag;BeibuwanBasin迈陈凹
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