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1、學(xué)兔兔www.xuetutu.com--5天Lt+-A第29卷第6期01L&GASGEOLOGY2008年12月文章編號:0253—9985(2008)06—0716—05濟陽坳陷第三系不整合油氣藏運聚成藏模式:l3宋國奇,卓勤功,孫刑中國石油化工股份有限公司勝利油田有限公司,山東東營257001;2.中國石油化工股份有限公司勝利油田有限公司地質(zhì)科學(xué)研究院,山東東營257015;3武警黃金第九支隊,海南???70216)摘要:濟陽坳陷第三系不整合油氣藏平面上主要位于盆緣地層超剝帶內(nèi)的大型鼻狀構(gòu)造和
2、凸起的翼部,縱向上主要分布在一級不整合面附近。根據(jù)不整合面上、下地層的風化程度及其保存狀況,將第三系不整合體劃分為3種結(jié)構(gòu)類型:I型、Ⅱ型和Ⅲ型。不同的結(jié)構(gòu)類型具有不同的輸導(dǎo)/遮擋能力。第三系不整合油氣成藏的主控因素可概括為古地貌、輸導(dǎo)體系和遮擋層。根據(jù)圈閉發(fā)育的構(gòu)造位置、儲層產(chǎn)狀和油氣運移的方向,建立了斜坡正向運聚和凸起側(cè)向運聚兩種不整合油氣藏運聚成藏模式。兩種成藏模式通常均可發(fā)育近源遮擋油氣藏和遠源超覆油氣藏,不整合體結(jié)構(gòu)中的“滲透天窗”是兩類油氣藏的轉(zhuǎn)折點。關(guān)鍵詞:不整合體結(jié)構(gòu);不整合油氣藏
3、;成藏主控因素;成藏模式;濟陽坳陷中圖分類號:TEl22.3文獻標識碼:AHydrocarbonmigrationandaccumulationpatternsintheTertiaryunconformityreservoirsoftheJiyangdepressionSongGuoqi,ZhuoQingong,SunLi(1.SINOPECShengliOilfieldco.Ltd.,Dongying,Shandong257001,China;2.GeologicalScientifcRese
4、archInstitute,SINOPECShengliOilfieldCo.Ltd.,Dongying,Shandong257015,China)Abstract:Laterally,theTertiaryunconformityreservoirsoftheJiyangdepressionaremainlydistributedinthelargenosingstructuresofthemarginaloverlapzonesandtheflanksofsalients,whileverti
5、cally,theyoccurmainlynearthefirst—orderunconformitysurface.Threetypesofstructures,namelythetypeI,lI,andHI,areidentifiedintheTertiaryunconformitysurfaceaccordingtothedegreeofweatheringandpreservationofstratabothaboveandbelowthesurface.Differenttypesofs
6、tructuresvaryinc0nductivity/sealingability.ThemainfactorsthatcontrolhydrocarbonaccumulationintheTertiaryunconformityreservoirsarepalaeogeomorphology,conductingsystemsandbarrierbeds.Twopatternsofhydrocarbonmigrationandaccumulation,namelyforwarddirectio
7、npat‘ternonslopeandsidewaypatternonsalient.a(chǎn)reestablishedthroughobservationofstructurallocationofuncon-fortuitytraps,occurrenceofreservoirs,andmigrationdirectionofhydrocarbons.Bothofthepatternsarefavorablefordevelopmentofproximalsealedreservoirsanddis
8、taloverlapreservoirs,withthe“conductinghatch”inun—conformitybodyactingasthetransitionbetweenthesetwokindsofreservoirs.Keywords:unconformitybody;unconformityreservoir;maincontrollingfactorforreservoiring;reservoiringpattern;JiyangDepression不整合圈