巴楚地区寒武系碳酸盐岩白云石化机制.pdf

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1、石油勘探与开发1982012年4月PETR0LEUMEXPL0RAT10NANDDEVEL0PMENTVO1_39NO．2文章编号：1000．0747(2012)02—0198-05巴楚地区寒武系碳酸盐岩白云石化机制周波，李明，段书府，朱长见2，邬光辉，曾昌民2，高力(1．中国石油勘探开发研究院；2．中国石油塔里木油田公司)摘要：通过系统取样进行地球化学分析，研究塔里木盆地巴楚地区寒武系碳酸盐岩地球化学特征，在此基础上对盐上白云岩、盐间灰岩及盐下白云岩的白云石化成因进行对比研究。盐间灰岩中的白云石O值大于一6％

2、o，013C值一般大于一1‰，s7Sr／Sr值略低于古海水，Mn和Na元素富集，表明白云石化作用发生在沉积早期，系萨布哈成因；盐上白云岩以中一粗晶白云岩为主，¨C值偏负，018O值偏负但均大于一9％o，sr／8sr值趋同于古海水，反映形成于浅埋藏环境；盐下白云岩以粉一细晶白云岩为主，013C值偏正，018O值偏负，sr／8。sr值大，Fe和sr元素富集，形成于局限台地的超盐度蒸发环境中，系渗透一回流成因，并受后期深埋藏高温环境影响。图3表3参18关键词：塔里木盆地；寒武系；巴楚地区；碳酸盐岩；白云石化作用中图分

3、类号：TEl22．1文献标识码：ADolomitizationmechanismofCambriancarbonatesintheBachuarea，TarimBasin，NWChinaZhouBo，LiMing，DuanShufu，ZhuChangjian，WuGuanghui，ZengChangmin，GaoLif1．PetroChinaResearchInstituteofPetroleumExploration＆Development，Beijing100083，China2．PetroChinaTar

4、imOilfieldCompany，Korla841000，China)Abstract：GeochemicalcharacteristicsoftheCambriancarbonatesarestudiedthroughsystematicsamplingintheBachuareaoftheIrimBasin．Thedolomitizationmechanismsarecomparedandanalyzedofthedolomitesabeveandbelowsaltbedsandlimestonebetw

5、eenthesaltbeds．TheOvaluesofdolomitesinthelimestonebetweensaltbedsarelargerthan-6％0．the”Cvaluesarenormallylargerthan-1％0．theSr／8。SrvaluesaresmallerthanancientseawaterplusMnandNaelementenrichment．Allthesefeaturessuggestthatthedolomitesaredevelopedduetoearlysab

6、akhadolomitization．Forthedominantlymedium—andcoarse-graineddolomitesabovetheupppersaltbed，the613Cvaluesofsamplesarelowerthanzerothe0valuesarenormally一9％。一0，theSr／86Srvaluesare，closetoancientseawater．Thesefeaturesshowthatthedolomitesaredevelopedinashallowburi

7、alenvironment．Forthedominantlypowderedandfinedolomitesbelowthelowersaltbed，the“Cvaluesofsamplesarelargerthanzero，me0valuesarenormallylowerthanzero．theSr／s。Srvaluesarelargerthantheabovementioneddolomites．plusFeandSrelementenrichment．Thesefeaturesindicatethatt

8、hedolomitesaredevelopedwithinanevaporateenvironmentonarestrictedplatform，andtheyareofpenetrationrefluxdolomitizationandafectedbythedeepburialhyperthermalenvironmentlaterKevwords：1larimBasin；Camb