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时间:2019-03-05
《龙门山北段山前带侏罗系油砂岩成因研究》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、第29卷第6期石油雾籍沾届V01.29,No.62007年12月PETROLEUMGEOLOGY&EXPERIMENTDec.,2007文章编号:1001--6112f2007)06--0604--05龙门山北段山前带侏罗系油砂岩成因研究戴鸿鸣1,刘文龙1,杨跃明2,李跃纲2,段勇(1.西南石油大学,成都610500;2.中国石油西南油气田分公司川西北气矿,四川江油621700)摘要:龙门山北段山前带处于推覆体构造带的断层隐伏前锋构造带,已发现中坝、河湾场气田和较多油气显示。野外调查和钻井发现侏罗系油浸砂岩广泛存在,认为油砂岩中原油是寒武系泥质烃源岩在生油高峰期生成的原油经历了
2、不同程度的生物降解和长距离的运移后,在多期构造幕作用下,多次充注、运移、再分配的产物。主要依据为:油砂岩正构烷烃和支链烷烃均已消失,遭受强烈生物降解;芳烃碳同位素相近,为一34.41‰~一35.03‰;裂解产物轻烃正构烷烃相对支链烷烃占优势,属海相I—111千酪根生成产物;生物标志化合物分布特征与寒武系黑色泥岩相似;甲基菲指数折算的成熟度为0.82%~1.25%。关键词:油气地球化学;油砂岩;侏罗系;龙门山北段;四川盆地中图分类号:TELl22.1文献标识码:ATHEoRIGINOFJURASSICoIL—SOAKEDSANDSToNEINTHEPIEDMONTZONEOFNo
3、RTHLONGMENSHAN,THESICHUANBASINDaiHongmin91。,LiuWenlon91,YangYuemin92,LiYuegan92,DuanYon92(1.SouthzoestPetroleumUniversity,Chengdu,Sichuan610500,China;2.NorthwestSichuanGasFieldMine,SouthwestOilandGasFieldBrand,PetroChina,Jiangyou,Sichuan621700,China)Abstract:ThepiedmontzoneoftheNorthLongmens
4、hanislocatedatthefaultfrontstructuralzoneofburiedfaultsofthestructuralandGasfeildsandmorenappebelt.ZhongbaHewangchanghydrocarbonshowarediscovered.TheJurassicoil—soakedsandstoneisdiscoveredtobewidedistributionbyfieldsur—veyandwelldrilling.Itbelievesthatthecrudeoilofoil—soakedsandstoneisthepro
5、ductwhichgeneratesintheoilgenerationpeakofCambrianmuddysourcerock.Itistheproductionbymoretimecharging,movementandredistribution,whichisafterthevaryingdegreesbiodegradationandlongdistancemove—ment,andunderthepolytectonicmovement.Themaincriterionsarefollowing.First,thenormalal—kaneandbranchedp
6、araffinofoil—soakedsandstonedisappearbystrongbiodegradation.Second,thecar—bonisotopeofaromatichydrocarbonisclosed.Itis一34.41%0~一35.03‰.Lighthydrocarbonnormalalkaneinthehydrolyticproductispredominantlytocomparewithhydrocarbonbranchedparaffin.Itbe—longstotheproductofmarineI—n1typekerogen.Third
7、,thepatternofbiomarkerissimilartoCam—briandarkclaystone.Atlast,thematuritywhichisconvertedbymethylphenanthreneindexis0.820A~1.25%.Keywords:hydrocarbongeochemistry;oil—soakedsandstone;Jurassic;theNorthLongmenshan;theSichuanBasin龙门山推覆构造带位于松潘一甘孜褶皱带与马角
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