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1、珠江口盆地文昌B凹陷及周邊油氣成藏特征與有利勘探領(lǐng)域第33卷第3期2011年6月石油察詒沾屬PETR0LEUMGE0LoGY&EXPERIMENTVoI.33.No.3Jun.,2011文章編號:1001—6112I2011)03—0297—06珠江口盆地文昌B凹陷及周邊油氣成藏特征與有利勘探領(lǐng)域張迎朝,陳志宏,李緒深.,徐新德,李琦.(1.中國地質(zhì)大學(xué)資源學(xué)院,武漢430074;2.中國海洋石油總公司湛江分公司研究院,廣東湛江524057;3.中國地質(zhì)大學(xué),北京10O083)摘要:利用烴源巖分析,油一源對比和成藏綜合分析等技術(shù),研究了文昌B凹陷及周邊
2、的油氣來源和成藏歷程,闡明了不同區(qū)帶的主力烴源巖與油氣成藏特征,深化了油氣成藏主控因素認(rèn)識,提出了有利油氣勘探方向.研究認(rèn)為,文昌B凹陷文昌組淺湖相烴源巖是凸起區(qū)成藏的主要貢獻(xiàn)者,是該區(qū)除眾所周知的中深湖相優(yōu)質(zhì)烴源巖外的另一種優(yōu)質(zhì)烴源巖.南斷裂帶下降盤文昌組湖相烴源巖沉積期末經(jīng)歷了構(gòu)造反轉(zhuǎn)抬升,具有"延遲生排油,多期持續(xù)油充注"的成藏過程,三號斷裂帶下降盤具有"早期生排油,多期油氣充注"的成藏過程.良好的文昌組湖相烴源巖,多幕式斷裂活動,多套區(qū)域性優(yōu)質(zhì)儲蓋組合是該區(qū)復(fù)式油氣成藏的主控因素.提出文昌B凹陷反轉(zhuǎn)陡坡帶,北斜坡中深層古近系,瓊海凸起珠江組一段上部是有
3、利油氣勘探方向.關(guān)鍵詞:淺湖相烴源巖;成藏過程;成藏主控因素;勘探方向;文昌B凹陷及周邊;珠江口盆地中圖分類號:TE122.3文獻(xiàn)標(biāo)識碼:APetroleumaccumulationcharacteristicsandfavorableexplorationdirectionsinWenchangBSaganditssur-roundingareas,PearlRiverMouthBasinZhangYingzhao,ChenZhihong,LiXushen,XuXinde,LiQi.(1.ChinaUniversityofGeosciences,Wuhan,
4、Hubei430074,China;2.ResearchInstituteofZhangJiangBranchCompany,CNOOC,Zhanjiang,Guangdong524057,China;3.ChinaUniversityofGeosciences,Beijing100083,China)Abstract:Basedonsourcerockanalysis,oil——sourcecorrelationandaccumulationcomprehensiveanaly—sis,oi1sourceandaccumulationprocessinthe
5、WenchangBSaganditssurroundingareaswerestudied.Mainsourcerockandhydrocarbonaccumulationfeaturesindifferentregionswereillustrated.Maincon—trollingfactorsofhydrocarbonaccumulationandfavorableexplorationdirectionswerepointedout.Sha—llowlacustrinesourcerockoftheWenchangFormationintheWenc
6、hangBSagwasthemaincontributorforaccumulationinupliftingregionbesidesthewell—knownmiddle--deeplacustrinesourcerock.Attheendofdeposition,lacustrinesourcerockoftheWenchangFormationinthedownthrowofsouthernfaultexperiencedtectonicinversion,resultinginthedelayofoilgenerationandexpulsionas
7、wellasthemulti—stagesofoilcharging.ThedownthrowoffaultNo.3wasalsocharacterizedbyearlyoilgenerationandexpulsionaswellasmulti—stagesofoilcharging.FavorablelacustrinesourcerockoftheWenchangFor—marion,multi—stagesoffaultactivitiesandsetsofreservoir--caprockassemblagesworkedasthemaincont
8、rollingfactorsforhy
