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1、維普資訊http://www.cqvip.comVoI.27NO.2第27卷第2期石油學報ACTAPETROLEISINICAMar.2006J2006年3月文章編號:0253—2697(2006)02—0001—05蘇丹邁盧特盆地石油地質特征及成藏模式童曉光徐志強史卜慶竇立榮肖坤葉(1.中國石油天然氣勘探開發(fā)公司北京100034i2.中國石油勘探開發(fā)研究院北京100083)摘要:邁盧特盆地是蘇丹東南部中一新生代的一個大型陸內裂谷盆地。該盆地發(fā)育了強一弱一強3期裂谷,這決定了下白堊統(tǒng)發(fā)育主力生油巖、古近系發(fā)育主力成藏組合。利用地震資料推斷出北部凹陷是主力
2、生烴凹陷,凹陷的半地塹結構和平面斜列特征決定了緩坡帶是主力成藏帶。而且盆地地溫梯度偏低使成藏期偏晚,為古近系提供了充足油源。據此建立了有別于鄰區(qū)Muglad等盆地和渤海灣盆地的成藏模式,明確了盆地資源潛力和有利勘探方向,為Palogue世界級大油田的快速發(fā)現提供了依據。關鍵詞:蘇丹;邁盧特盆地;石油地質特征;成藏模式;裂谷盆地;油藏特征中圖分類號:TE111文獻標識碼: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氣富集區(qū)之一。中西非裂谷整盆地為對象的風險勘探項目。