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1、第35卷第3期OIL&GASGEOLOGY2014年6月文章編號(hào):0253-9985(2014)03-0311-06doi:10.11743/ogg201403瓊海凸起新近系低幅-低阻油藏形成條件及成藏模式甘軍,張迎朝,鄧廣君,陸江,鄭榕芬[中海石油(中國(guó))有限公司湛江分公司勘探開發(fā)研究院,廣東湛江524057]摘要:綜合應(yīng)用油氣地球化學(xué)、儲(chǔ)層沉積學(xué)及成藏綜合研究方法,剖析了瓊海凸起文昌13區(qū)珠江組一段低幅-低阻油藏的油氣來源、運(yùn)移及成藏特征,深化了該區(qū)高阻、低阻油層成藏過程及運(yùn)聚規(guī)律的認(rèn)識(shí)。研究表明:1)文昌13-X珠江組一段低阻油層的原油主要來自文昌A凹陷恩
2、平組淺湖相泥巖,該套烴源巖是文昌凹陷除文昌組中深湖泥巖之外的又一套優(yōu)質(zhì)生油巖。2)文昌13區(qū)珠江組一段低阻油層具備發(fā)育在低幅度披覆背斜上的構(gòu)造+巖性成藏模式,儲(chǔ)層類型為淺海低能環(huán)境下發(fā)育的濱外砂壩泥質(zhì)粉砂巖,儲(chǔ)層巖性細(xì)、泥質(zhì)含量高是低阻油層形成的主要原因。3)本區(qū)低阻油藏具備圈閉低幅度、儲(chǔ)層低滲的特征,油氣運(yùn)移進(jìn)入圈閉需要克服較大的毛細(xì)管阻力。4)本區(qū)珠江組一段低阻油層是其下覆高阻油層的次生油藏,形成縱向上高阻、低阻油層疊置伴生的油氣富集帶;低幅-低阻油藏勘探開發(fā)潛力大,是成熟區(qū)挖潛的重要領(lǐng)域。關(guān)鍵詞:低幅構(gòu)造;低阻油層;恩平組;瓊海凸起中圖分類號(hào):TE122.
3、3 文獻(xiàn)標(biāo)識(shí)碼:AFormingconditionsandhydrocarbonaccumulationpatternsoftheNeogenelowresistivityreservoirsinlow-amplitudestructureofQionghaiSalientGanJun,ZhangYingzhao,DengGuangjun,LuJiang,ZhengRongfen(ResearchInstituteofPetroleumExploration&Developmen,ZhanjiangBranchofCNOOC,Zhanjiang,Guangd
4、ong524057,China)Abstract:Usinggeochemical,sedimentaryandhydrocarbonaccumulationanalysismethods,thispaperstudiedthecharac-stteristicsofsourcerocks,hydrocarbonmigrationandaccumulationofthelowresistivityreservoirsofthe1MemberofZhu-jiangFormation(Zhu1)inthelow-amplitudestructureofQiongha
5、isalientinWenchang-13block,Qionghaisalient.Thefollowingresultswereobtained.TheoiloftheZhu1lowresistivityreservoirinWenchang13-XismainlysourcedfromtheshallowlacustrinemudstoneofEnpingFormationinWenchangsag,whichisanotherhighqualitysourcerockinadditiontotheWenchangFormationmudstoneofmi
6、d-deeplacustrinefaciesin.ThelowresistivityreservoirsofZhu1inWen-chang13blockareofstructural-lithologiccompositetypedevelopedinthelowamplitudedrapeanticlines.Themainreser-voirconsistsofoffshorefinemuddysiltstonewithfinegrainandhighmudcontent,whicharethemaincausesofthelowresistivity.Th
7、elowresistivityreservoirsareacharacterizedbylowamplitudestructureandlowpermeability.Thelowresis-tivityreservoirsaresecondaryaccumulationwithhydrocarbonssourcedfromtheunderlyinghighresistivityreservoir.Thelowresistivityandhighresistivityreservoirssuperimposeverticallytoformahydrocarbo
8、nenrichmentz