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1、第36卷第3期石油察劈沾屆Vo1.36,No.32014年5月PETRoLEUMGEoLoGY&EXPERIMENTMay,2014文章編號:1001-6112(2014)03—0337—09doi:10.1178l/sysydz201403337南海北部邊緣盆地油氣地質(zhì)特征及成藏主控因素鐘佳,周江羽,張莉,陳昱瑤,葉慶峰,齊同勝,張亞萍,王慧(1.中國地質(zhì)大學構(gòu)造與油氣資源教育部重點實驗室,武漢430074;2.國土資源部廣州海洋地質(zhì)調(diào)查局,廣州510760;3.中國石化勝利石油工程有限公司巴州井下分公司,新疆巴音郭楞蒙古自治州841600)摘要:南
2、海北部邊緣盆地發(fā)育三套主力烴源巖,包括斷陷期湖相和海陸過渡相烴源巖,以及坳陷期海相烴源巖。儲層發(fā)育“三套兩類”,即陸相砂巖、海陸過渡相砂巖以及海相砂巖和碳酸鹽巖。斷陷期湖相泥巖為較好局部蓋層,中新世以來廣泛沉積的海相泥巖是良好的區(qū)域蓋層。圈閉豐富,其類型主要有構(gòu)造、地層和復合圈閉。南海北部邊緣盆地表現(xiàn)出油氣共生、階梯狀輸導、環(huán)洼聚集、斷裂控藏的油氣成藏特征。分析認為,烴源巖和熱場共同控制著南海北部邊緣盆地的油氣分布;輸導體系是油氣運移的必經(jīng)通道,并決定著油氣藏層位的分布;此外,環(huán)洼分布的構(gòu)造帶是油氣運聚的有利指向區(qū)。關鍵詞:油氣地質(zhì);主控因素;油氣成藏
3、;邊緣盆地;南海北部中圖分類號:TEl22文獻標識碼:AHydrocarbongeologycharacteristicsandkeycontrollingfactorsofmarginalbasinsofnorthernSouthChinaSeaZhongJia,ZhouJiangyu,ZhangLi,ChenYuyao,YeQingfeng,QiTongsheng,ZhangYaping,WangHui(1.KeyLaboratoryofTectonicsandPetroleumResourcesofMin~tryofEducation,China
4、UniversityofGeoscienees,Wuhan,Hubei430074,China;2.GuangzhouMarineGeologicalSurvey,MinistryofLandandResources,Guangzhou,Guangdong510760,China;3.BazhouDownholeServiceBranchofShengliPetroleumEngineeringCorporationLimited,SINOPEC,MongolianAutonomousP咖ctureofBayingolin,Xinjiang841600
5、,China)Abstract:InthemarginalbasinsofthenorthernSouthChinaSea,3setsofmainsourcerocksdeveloped,inclu—dinglacustrineandtransitionalsourcerocksinthetifingperiodandmarinesourcerocksinthedepressionstage.Thereare3setsand2typesofreservoirs,namelycontinentalsandstones,transitionalsandst
6、ones,marinesand.stonesandcarbonaterocks.Thelacustrinemudstoneintheriflingsequenceisfavorablelocalsealandthewide.spreadmarinemudstoneeversinceMioceneisgoodregionalcaprock.Thereareabundanttrapswiththemainstylesofstructural,stratigraphicandcompoundones.Hydrocarbonaccumulationinthes
7、tudyareaisfeaturedbyoilandgascoexistence,step—likemigration,accumulationaroundsags,andfault’Scontroloverhydrocarbonreservoir.OilandgasdistributioninthemarginalbasinsofthenorthernSouthChinaSeaiscontrolledbysourcerocksandgeothermalheatflows.Thetransportationsystem,whichisanessenti
8、alpathwayforhydrocarbonmigration,alsodetermines