蘇丹邁盧特盆地石油地質(zhì)特征及成藏模式

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1、維普資訊http://www.cqvip.comVoI．27NO．2第27卷第2期石油學(xué)報(bào)ACTAPETROLEISINICAMar．2006J2006年3月文章編號(hào)：0253—2697(2006)02—0001—05蘇丹邁盧特盆地石油地質(zhì)特征及成藏模式童曉光徐志強(qiáng)史卜慶竇立榮肖坤葉(1．中國(guó)石油天然氣勘探開(kāi)發(fā)公司北京100034i2．中國(guó)石油勘探開(kāi)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(gè)大型陸內(nèi)裂谷盆地。該盆地發(fā)育了強(qiáng)一弱一強(qiáng)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(jié)構(gòu)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(jù)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(jí)大油田的快速發(fā)現(xiàn)提供了依據(jù)。關(guān)鍵詞：蘇丹；邁盧特盆地；石油地質(zhì)特征；成藏模式；裂谷盆地；油藏特征中圖分類號(hào)：TE111文獻(xiàn)標(biāo)識(shí)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(duì)象的風(fēng)險(xiǎn)勘探項(xiàng)目。