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1、石油勘探與開發(fā)3042012年6月PETROLEUMEXPLORAT10NANDDEVEL0PMENTVOl_39NO.3文章編號(hào):1000-0747(2012)03—0304—09北部灣盆地潿西南凹陷古近系層序結(jié)構(gòu)與非構(gòu)造圈閉王健,操應(yīng)長,李俊良2(1.中國石油大學(xué)(華東)地球科學(xué)與技術(shù)學(xué)院;2.中海石油(中國)有限公司湛江分公司研究院)基金項(xiàng)目:國家重大科技專項(xiàng)課題(2008ZX05023.02);教育部新世紀(jì)優(yōu)秀人才支持計(jì)劃(NCET-06—0604)摘要:運(yùn)用Vail層序地層學(xué)理論,綜合利用地震、測井、錄井等資料,對潿西南凹陷古近系流沙港組和潿洲組
2、進(jìn)行層序地層劃分,建立層序地層格架,分析層序結(jié)構(gòu)特征及非構(gòu)造圈閉的發(fā)育規(guī)律。在該地區(qū)共識(shí)別出1個(gè)一級層序界面、2個(gè)二級層序界面和8個(gè)三級層序界面,劃分出10個(gè)三級層序。依據(jù)層序界面結(jié)構(gòu)特征,將層序界面分為T1型、T2型和T3型3種類型;依據(jù)層序地層結(jié)構(gòu)特征,將10個(gè)三級層序分為一分層序、二分層序、三分層序和四分層序4種類型。T1型和T3型層序界面之上有利于發(fā)育地層超覆不整合圈閉,T2型和T3型層序界面之下有利于發(fā)育不整合遮擋圈閉,三分和四分層序早期及二分和四分層序晚期有利于發(fā)育巖性圈閉。圖6表1參18關(guān)鍵詞:層序地層;層序界面;層序結(jié)構(gòu);非構(gòu)造圈閉;潿西南
3、凹陷中圖分類號(hào):TEl21.3文獻(xiàn)標(biāo)識(shí)碼:ASequencestructureandnon-structuraltrapsofthePaleogeneintheWeixi’nanSag,BeibuwanBasinWangJian,CaoYingchang,LiJunliang(1.SchoolofGeosciences,ChinaUniversityofPetroleum,Qingdao266580,China;2.ZhanjiangBranchofCNOOCLtd.,Zhanjiang524057,China)Abstract:BasedonVailse
4、quencestratigraphictheoryandanalysisofseismicandlogginginformation,thesequenceinthePaleogeneLiushagangandWeizhouformationsintheWeixi’nanSagisclassified,thestrataframeworkofsequenceisdefinedandestablished,thecharacteristicsofsequencestructureareanalyzedandthedistributionofnon—struc
5、turalflapsisrevealed.Onefirst—ordersequenceboundary,twosecond-ordersequenceboundaries,eightthird—ordersequenceboundariesandtenthird—ordersequencesareidentifiedintheLiushagangandWeizhouformations.Accordingtothecharacteristicsofsequenceboundarystructure,thethird—ordersequenceboundar
6、iescanbedividedintothreetypes:typeT1,typeT2,andtypeT3.Andaccordingtothecharacteristicsofsequencestratigraphicstructure,thetenthird—ordersequencescanbeclassifiedintofourtypes:one—dividedsequence,two—dividedsequence,three-dividedsequence,andfour-dividedsequence.Thefavorableareasfort
7、hedevelopmentofstratigraphicoverlaptrapsareabovetypeT1andtypeT3sequenceboundaries,whiletheunconformitybarriertrapsaredevelopedbelowtypeT2andtypeT3sequenceboundaries.Thefavorabledevelopmentperiodsoflithologictrapsaretheearlyperiodofthree—dividedsequenceandfour-dividedsequenceandthe
8、lateperiodoftwo—dividedsequencean