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1、塔中地区原油芳烃的地球化学研究塔中地区原油芳烃的地球化学研究学生:孟江辉,地球化学系指导教师:张敏,地球化学系[摘要]塔中地区的原油均为海相原油,进一步从油源上可划分为O2+3原油和∈-O1原油以及少量以这两套原油为端元组分的混源油。本文以芳烃绝对定量GC/MS技术,通过对塔中地区7个原油样品进行芳烃地球化学研究,揭示出O2+3原油和∈-O1原油的芳烃分布和组成存在一定差别。O2+3原油中菲系列的含量低(10%),萤蒽和芘的含量极少(0.1%),未检测到蒽,联苯和三芴系列的含量相对高;∈-O1原油中菲系列含量丰富(
2、12-23%),萤蒽和芘的含量相对高(1%),检测到蒽(0.5%),联苯和三芴系列的含量相对低。芳烃的指纹相关分析也收到了较好的效果。O2+3原油和∈-O1原油氧芴系列和屈系列的内组成也存在一定的差异。塔中地区原油的DBT/P为0.32-0.54,1,2,5-/1,3,6-TMN为0.16-0.34,进一步确定了塔中地区的沉积环境为海相沉积。由芳烃成熟度指标,如甲基菲指数Ⅰ(MPI-1)为0.45-1.20,甲基硫芴的比值(MDR)为3.11-6.03,甲基屈比值(3-/1-MCH)为3.79-8.22,可推算出与
3、塔中地区原油相当的RO值为0.9%左右,表明这些原油进入了成熟阶段。[关键词]塔中地区原油芳烃地球化学油源对比成熟度ThegeochemicalresearchofPolycyclicaromatichydrocarbonsfromoilsinTazhongarea
Student:MengJianghui,ThedepartmentofGeochemistrySupervisor:Zhangmin,ThedepartmentofGeochemistry[Abstract]TheoilsofTazhongareaa
4、remarineoil,andcanbeclassifiedintoO2+3oiland∈-O1oilandfewmixturesofO2+3and∈-O1end-memberoilsbytheirsource.ThispaperwillindicatesthatthereareappreciabledifferencesindistributionandcompositionsofthearomatichydrocarbonsbetweenO2+3oiland∈-O1oilbystudyingthe7oilsam
5、plesofTazhongareawhichisbasedonthetechniqueofaromaticabsolutequantitationGC/MS.TheO2+3oilhaverelativelylowamountofphenanthrene(10%)homologueandfew27塔中地区原油芳烃的地球化学研究fluorantheneandpyrene(0.1%)andnoanthracene.Theabundanceoffluorine,dibenzothiophene,dibenzofuranan
6、dbiphenylinO2+3oilisrelativelyhigh.The∈-O1oilhaverelativelyhighamountofphenanthrene(12-23%)andfluorantheneandpyrene(1%),buttheamountoffluorine,dibenzothiophene,dibenzofuranandbiphenylisrelativelylow.Remarkably,wefoundanthracene(0.5%)in∈-O1oil.Thefingerprintcor
7、relationanalysisofaromatichydrocarbonhasalsoreceivedobviouseffect.TheinteriorcompositionsofdibenzofuranandchrysenebetweenO2+3oiland∈-O1oilaresignificantdifferent,also.ThedepositionalenvironmentofTazhongareawhichismarinedepositwasre-identifiedbyusingDBT/P(0.32-
8、0.54)and1,2,5-/1,3,6-TMN(0.16-0.34)ofoil.Thearomaticmaturityindicators,forexample,methylphenanthreneindexⅠ(MPI-1,0.45-1.20)andmethyl-dibenzothiopheneratio(MDR,3.11-6.03)andmethylch