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1、第28卷第4期現(xiàn)代地質(zhì)Vol28No42014年8月GEOSCIENCEAug2014松遼盆地北部西斜坡青山口組三段四級(jí)層序格架內(nèi)沉積微相分布1221111辛仁臣,王樹恒,梁江平,姜濤,李瑾,王林,郝莎(1中國地質(zhì)大學(xué)(北京)海洋學(xué)院,北京100083;2大慶油田有限責(zé)任公司勘探開發(fā)研究院,黑龍江大慶163712)摘要:松遼盆地西部斜坡青山口組三段劃分3個(gè)四級(jí)層序(Cg2、Cg1、Cg0),每個(gè)四
2、級(jí)層序均可劃分為四級(jí)湖泊擴(kuò)張?bào)w系域和四級(jí)湖泊收縮體系域,自下而上,Eg2地層分布范圍最大,Sg2地層分布范圍略小,地層尖滅線位于西斜坡的西部;Eg1地層尖滅線位于西斜坡的中部,Sg1地層分布范圍比Eg1略?。唬牛纾暗貙蛹鉁缇€位于西斜坡的東部,Sg0地層尖滅線進(jìn)一步東移。剖面上,富砂的三角洲前緣和濱淺湖砂質(zhì)灘壩在三級(jí)和各四級(jí)層序界面附近最為發(fā)育,而四級(jí)層序最大湖泛面附近以富泥的濱淺湖混合灘微相為主。平面上,不同四級(jí)層序體系域的沉積微相分布既有一定繼承性,又有明顯的差異性。關(guān)鍵詞:松遼盆地;西部斜坡;
3、青山口組三段;高頻層序;沉積微相中圖分類號(hào):P5392;TE1213文獻(xiàn)標(biāo)志碼:A文章編號(hào):1000-8527(2014)04-0782-09SedimentaryMicrofaciesDistributionunderthe4thorderSequenceStratigraphicFrameworkoftheThirdMemberofQingshankouFormationinWestSlopeoftheNorthernPartofSongliaoBasin1221111XINRench
4、en,WANGShuheng,LIANGJiangping,JIANGTao,LIJin,WANGLin,HAOSha(1SchoolofOceanSciences,ChinaUniversityofGeosciences,Beijing100083,China;2ExplorationandDevelopmentResearchInstituteofDaqingOilfieldCompanyLtd,Daqing,Heilongjiang163712,China)Abstract:The
5、thirdmemberofQingshankouFormationinthewestclinoformoftheSongliaoBasinwasdividedinto34thordersequences(Cg2,Cg1,Cg0),eachofthe4thordersequencecanbedividedintolakeexpandingsystemtractandlakeshrinkingsystemtract,upwardly,theareaofEg2isthelargest,thearea
6、ofSg2waslittlesmaller,whichpinchoutlinewaslocatedinthewesternpartofthewestclinoform;ThepinchoutlineofEg1waslocatedinthemiddleofthewestclinoform,andtheareaofSg1waslittlesmallerthanEg1;ThepinchoutlineofEg0waslocatedintheeastofthewestclinoformregionan
7、dpinchoutlineofSg0furthermigratedtowardeastIntheprofilesection,sandrichdeltafrontandshoreshallowlacustrinesandybeachbarsmostlydevelopednearbythe3rdor4thordersequenceboundary,whilethemainsedimentarymicrofacieswasthemudrichshoreshallowlacustrine
8、mixedbeachwhichdevelopednearbythemaximumfloodingsurfacesofthe4thordersequenceIntheplane,thecharacteristicsofmicrofaciesdistributionofdifferent4thsequencessystemtractshascertaininheritance,andhastheobviousdifferenceKeywords:SongliaoBasin;we