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时间:2020-03-26
《长岭断陷火山岩储层内碳酸盐矿物碳氧同位素组成及其成因.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、矿物岩石地球化学通报·研究成果·BulletinofMineralogy,PetrologyandGeochemistryVoL31No.1,Jan.2012长岭断陷火山岩储层内碳酸盐矿物碳氧同位素组成及其成因于文修,陆建林,张庆龙,张彦霞,王保华1.南京大学地球科学系,南京210093;2.中石化石油勘探开发研究院无锡石油地质研究所,无锡214151摘要:碳酸盐矿物是火山岩储层内重要的矿物成分,长岭断陷火山岩储层内的自生碳酸盐矿物主要是3-解石。本文通过对营城组储层内方解石矿物的碳氧同位素特征分析,探讨储层内碳酸盐矿物成因。研
2、究表明,长岭断陷火山岩储层内方解石8scvJPn值范围为一12.7‰~O.4‰,8”Ov.so值范围为3.8%o12%o,具有高80值。与3-解石平衡的CO2碳同位素计算值范围较宽,为一16.O‰~2.2‰,表明其形成物质的多源性。在8”0-8C图解中显示,形成碳酸盐矿物的C02来源于幔源一岩浆无机成因的CO和有机质演化过程中产生的CO,以无机成因COz源为主。这些无机成因coz、有机成因cOz和沉积有机质热演化产生的有机酸溶于流体,形成酸性流体。火山岩储层中碳酸盐矿物的形成实质就是这种酸性流体与储层围岩反应的结果。关键词:火山
3、岩储层;碳氧同位素;碳酸盐矿物;方解石;长岭断陷中图分类号:P597文献标识码:A文章编号:1007—2802(2012)01—0082—07CarbonandOxygenIsotopicCompositionsandGenesisofCarbonateMineralsinaVolcanicReservoirfromtheChanglingRiftYUWen—xiu,,LUJian—lin。,ZHANGQing—long,ZHANGYan—xia,WANGBao—hua1.DepartmentofEarthSciences,Na
4、njingUniversity,Nanjing210093,China;2.WuxiResearchInstituteofPetroleumGeology,SEPRI,Wuxi214151,ChinaAbstract:CarbonatemineralisanimportantmineralcomponentintheYingChengformationvolcanicreservoiroftheChanglingrift,andcalciteisthemainauthigeniccarbonateminera1.Onthebas
5、isofisotopicanalysesofCandOinthecaleite,thegenesisofauthigeniccarbonatemineralinthisvolcanicreservoirwasstudied.Theresultsshowthatthe8。CV-PDBvaluesofcalciteinsamplescollectedfromthevolcanicreservoiroftheChanglingriftrangefrom一12.7‰to0.4‰;thatthesesamplesarecharacteri
6、zedbyhigh艿Ovaluesoffrom3.8%0to12%o;andthatthecalculated8”CvaluesofCO2gasequilibriumwithcalciterangefrom一16.0%oto2.2%0.Thelargevariationofcar—bonandoxygenisotopecompositionsindicatesthatmineral-formingmaterialmayderivefrommultiplesources.The艿。C_Odiagramofcalcitesugges
7、tsthatthecalcite—formingCO2gasoriginatedfrombothinorganicandorganicsources,mantleandmagmaaremajorsourcesandsedimentaryorganicmatteristhesecondarysource.Theinor—ganicandorganicCO2gasesandorganicacidsproducedbythethermalevolutionoforganicmatterdissolvedinthefluidtoform
8、anacidicfluid.Finally,thisfluidreactedwithsilicatemineralinthevolcanicreservoirtoformcarbon—ateminera1.Keywords:volcanicreservoir;C
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