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1、第36卷第4期石油察毖弛屆Vo1.36.No.42014年7月PETRoLEUMGEoL0GY&EXPERIMENTJu1.,2014文章編號(hào):1001-6112f2014)04—0516—07doi:10.11781/sysydz201404516北部灣盆地邁陳凹陷東部構(gòu)造物理模擬研究陳長(zhǎng)征,陳偉,吳峰,成為,周進(jìn)峰(中國(guó)石化江蘇油田分公司地質(zhì)科學(xué)研究院,江蘇揚(yáng)州225009)摘要:北部灣盆地邁陳凹陷斷裂系統(tǒng)十分復(fù)雜,為了明確其成因機(jī)制,在三維地震資料構(gòu)造解析的基礎(chǔ)上,應(yīng)用砂箱模擬實(shí)驗(yàn),對(duì)邁陳凹陷東部斷裂系統(tǒng)形成進(jìn)行分析。結(jié)果表明,邁陳凹陷東部可劃分為上、下2套斷裂系統(tǒng),下部斷
2、裂系統(tǒng)是受長(zhǎng)流一流沙港期NW—SE向區(qū)域拉張應(yīng)力形成,上部斷裂系統(tǒng)是受涸洲期NW—SE向區(qū)域拉張及右旋走滑應(yīng)力形成。并且下部斷裂體系受基底先存斷裂影響較大,走向、傾向、斷層組合都與其保持一致;上部斷裂體系受基底斷層影響較小,多為新生型斷層或繼承改造型斷層。潿洲期走滑程度的強(qiáng)弱直接影響斷裂發(fā)育的走向,弱走滑條件下實(shí)驗(yàn)結(jié)果與實(shí)際地質(zhì)特征吻合度高,并且發(fā)育的次級(jí)小斷層有利構(gòu)造圈閉的形成.對(duì)三維地震構(gòu)造精細(xì)解釋有指導(dǎo)作用。關(guān)鍵詞:構(gòu)造物理模擬;斷裂體系;成因機(jī)制;邁陳凹陷;北部灣盆地中圖分類號(hào):TEl21.2文獻(xiàn)標(biāo)識(shí)碼: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邁陳凹