埕北低断阶沙二段原油特性及油源分析-论文.pdf

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1、第34卷第3期洛浮石Vl01．34NO．32014年9月OFFSHOREOILSep．2014文章编号：1008．2336(2014)03．0046．05埕北低断阶沙二段原油特性及油源分析李忠梅，许名文，袁淑琴，刘荣军，马金龙(1．中国石油大港油田勘探开发研究院，天津300280；2．中国石油大港油田测试公司一分公司，天津300280；3．中国石油大港油田第一采油厂，天津300280)摘要：埕北低断阶区沙二段是大港油田近年来重点勘探层系之一，研究目标层段原油特点及油源对比分析对油气勘探具有重要的意

2、义。研究表明，原油物理性质总体表现出高成熟原油特征，具有四低一高的特点，即低密度，低黏度，低胶质+沥青含量、低含硫量及高含蜡量。原油地球化学性质和原油生物标志特征整体反映出生油母质形成于湖相沉积弱还原环境，具有丰富的藻类贡献，也表现出高成熟油特征。通过原油的物理四性分析和层系问油岩生物标志特征对比研究，分析认为其油气来源为两个方面：主要方面来自歧口凹陷和歧南次凹两大生油凹陷的双向供油，另一方面油气来自沙二段烃源岩的自生自储和沙三段的高成熟烃源岩。关键词：埕北低断阶；沙二段；原油；生物标志；油源对比

3、中图分类号：TE122．1文献标识码：ADOI：10．3969~．issn．1008—2336．2014．03．046AnalysisofCrudeOilCharacteristicsandOil--sourceCorrelationoftheSha--2MemberofShahejieFormationintheChengbeiLowStepFaultLIZhongmei，XUMingwen，YUANShuqin，LIURongjun2，MAJinlong(1．ExplorationandDev

4、elopmentResearchInstituteofCNPCDagangOilFieldCompany，Tianjin300280，China；2．TheFirstBranchofTestingCompanyofCNPCDagangOilFieldCompany，Tianjin300280，China；3．TheFirstOilProductionPlantofCNPCDagangOilFieldCompany，Tianjin300280，China)Abstract：TheSha一2Membe

5、rofShahejieFormationintheChengbeilowstepfaultisoneofthekeyexplorationtargetsofDagangOilfieldinrecentyears．Itissignificantforoilandgasexplorationtoana1)zethecharacteristicsofthecrudeoilinthetargethorizonsandconductoil—sourcecorrelation．Thestudyresultss

6、howsthatthecrudeoilgenerallyexhibithighmatureoilcharacteristicsinphysicalproperty,withthecharacteristicsoffourlowandonehigh，includinglowdensity,lowviscosity,lowgelandasphaltcontent，lowsulfurcontentandhighwaxcontent．Thecrudeoilgeochemicalpropertiesandt

7、hecharacteristicsofthecrudeoilbiomarkersindicatesthatthesourcemateriallsdepositedinthelacustrineweakreductionenvironment，reflectinghighcontributionofalgae，withhighmatureoilcharacteristics．Studyoffourphysicalcharacteristicsofthecrudeoilandcorrelationof

8、biomarkercharacteristicsbe—tweenoilsandsourcerocks，itisconcludedthattheoilandgasweresourcedmainlyfromtwoways，onewasfromthebidirectionaloilsupplyfromQikouSagandQinanSag，theotherwasfromself-generationandself-reservoiringSha一2Memberandhighmatures