苏丹迈卢特盆地石油地质特征及成藏模式

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1、维普资讯http://www.cqvip.comVoI．27NO．2第27卷第2期石油学报ACTAPETROLEISINICAMar．2006J2006年3月文章编号：0253—2697(2006)02—0001—05苏丹迈卢特盆地石油地质特征及成藏模式童晓光徐志强史卜庆窦立荣肖坤叶(1．中国石油天然气勘探开发公司北京100034i2．中国石油勘探开发研究院北京100083)摘要：迈卢特盆地是苏丹东南部中一新生代的一个大型陆内裂谷盆地。该盆地发育了强一弱一强3期裂谷，这决定了下白垩统发育主力生油岩、古近系发育主力成藏组合。利用地震资料推断出北部凹陷是主力

2、生烃凹陷，凹陷的半地堑结构和平面斜列特征决定了缓坡带是主力成藏带。而且盆地地温梯度偏低使成藏期偏晚，为古近系提供了充足油源。据此建立了有别于邻区Muglad等盆地和渤海湾盆地的成藏模式，明确了盆地资源潜力和有利勘探方向，为Palogue世界级大油田的快速发现提供了依据。关键词：苏丹；迈卢特盆地；石油地质特征；成藏模式；裂谷盆地；油藏特征中图分类号：TE111文献标识码：APetroleumgeologicpropertyandreservoir-formingpatternofMelutBasininSudanTongXiaoguangXuZhiqian

3、gShiBuqingDouLirongXiaoKunye(1．ChinaNationaloZandGasExplorationandDevelopmentCorporation，Beijing100034，China；2．ResearchInstituteofPetroleumExplorationandDevelopment，CNPC，Beijing100083，China)Abstract：MelutBasinisalarge-scalebasinoftheCretaceous—PaleogenesedimentinthesoutheasternSu

4、dan．Twostrongriftingpha—sesweredevelopedduringtheEarlyCretaceousandPaleocene，andoneweakriftingphasewasdevelopedinthebasinduringtheLateCretaceous．Consequently，themainsourcerocksweredepositedintheLowerCretaceousandthemainplaywasdevelopedinthePa—leocene．Basedonanalogueofseismicrefle

5、ctioncharactersandsequencestratigraphy，theLowerCretaceousintheNorthernMelutSub-Basin(NMSB)wasdeducedasthemainsourcekitchen．Thehalf-grabenstyleofNMSBmadethenortheasterngentleslopebe—comethemostadvantageousaccumulationareaforhydrocarbon．Furthermore，thelowergeothermalgradientcontrol

6、ledthecriticalmomentofpetroleumsystemintheLateEocene，whichprovidedenoughhydrocarbonschargingintothePaleocene．Accordingly，thepatternofreservoir-forminginMelutBasinwasestablished．ThispatternisquitedifferentfromadjacentMugladBasininSudanandBohaiBayBasininChina．Then，amorereasonablees

7、timationofpetroleumresourcesandmorescientificexplorationstrategyinMelutBasinofSudanweremadeonthepatternofreservoir-forming，andaGreatPalogueOilFieldwassuccessfullydiscoveredbyCNPC．Keywords：Sudan；MelutBasin；petroleumgeologicproperty；reservoir-formingpattern；riftbasin；reservoirchara

8、cters裂谷是全球重要的油气富集区之一。中西非裂谷整盆地为对象的风险勘探项目。