塔里木盆地北部奥陶系油气相态及其成因分析

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1、*塔里木盆地北部奥陶系油气相态及其成因分析张水昌1朱光有1杨海军2苏劲1杨德彬1朱永峰2张斌1崔洁1ZHANGShuiChang1，ZHUGuangYou1，YANGHaiJun2，SUJin1，YANGDeBin1，ZHUYongFeng2，ZHANGBin1andCUIJie1中国石油勘探开发研究院，北京1.1000832.中国石油塔里木油田勘探开发研究院，库尔勒8410001.ResearchInstituteofPetroleumExplorationandDevelopment，PetroChina，Beijing100083，China2.ResearchIns

2、tituteofPetroleumExplorationandDevelopment，TarimOilfieldCompany，PetroChina，Korla841000，China2010-09-09收稿，2010-12-18改回.ZhangSC，ZhuGY，YangHJ，SuJ，YangDB，ZhuYF，ZhangBandCuiJ.2011.ThephasesofOrdovicianhydrocarbonandtheiroriginintheTabeiuplift，TarimBasin.ActaPetrologicaSinica，27(8):2447－2460Abst

3、ractOrdovicianreservoirsofthenorthernTarimBasinwithabundanthydrocarbonresourcesareoneofthemostimportantexplorationtargets，andtheyhavemanycomplexhydrocarbonphases，suchascondensates，normaloils，heavyoilsandasphalts.Throughanalysesoftheformationandconservationprocessofmarineoilreservoirsandint

4、egratedwithgeochemicaldataofhydrocarbonsandfluidinclusions，weshowedthatthecomplexityofhydrocarbonphaseswascontrolledbymulti-stagehydrocarbonchargingandsecondaryalteration.OrdovicianreservoirsintheeasternTabeiareaexperiencedthreestagesofhydrocarboncharging，whichoccurredinLateCaledonian-Earl

5、yHercynian，LateHercynianandLateHimalayan.TheoilinthesereservoirswasgeneratedmainlyfromMiddle-UpperOrdoviciansourcerocks，whilethegaswasderivedfromcrackingofliquidhydrocarbonsassociatedwithCambriansourcerocks.DuringLateHercynian，Ordovicianreservoirsexperiencedhydrocarboncharginginthecentrala

6、ndwesternregionoftheTabeiupliftandthereoccurredthreestagesofhydrocarbonadjustmentaftertheformationofOrdovicianreservoirs.DuringEarlyHercynian，Silurian-Devoniansequenceswereerodedduetotectonicuplift，whichdestroyedpaleo-reservoirsofCambrianhydrocarbonsintheeastregionandformedasphalts.Thetect

7、onicmovementofpre-TriassicsedimentationinLateHercyniancausedlarge-scaledegradationanddensificationofOrdovicianoils.DuringLateHimalayan，thegasfromtheManjiaersagchargedthesereservoirsfromeasttowest，severelyalteringtheearly-formedreservoirsandformingsecondarycond