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时间:2020-03-26
《黔北上奥陶统五峰组烃源岩有机地球化学特征及古环境意义.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、地质通报Vo1.31.NO.11第31卷第11期2012年11月GEOLOGICALBULLETINOFCHINANov.,2012黔北上奥陶统五峰组烃源岩有机地球化学特征及古环境意义林家善,谢渊,刘建清,赵瞻,景小燕,罗洋。LINJia—shanI,XIEYuan,LIUJian—qing,ZHAOZhan,JINGXiao—yan,LUOYang31.中国地质调查局成都地质调查中心,四川成都610081;2.中国石化西南油气分公司勘探开发研究院,四川成都610081;3.中国石油西南油气田公司蜀南气矿,四川泸州6460011.ChengduCentel",ChinaGeol
2、ogicalSurvey,Chengdu61008J,Sichuan,China;2.Exploration&ProductionResearchInstitute,SWPB,Chengdu610081,Sichuan,China;3.Per0inaSouthwest0il&GasFieldCompany,Luzhou6460DJ,Sichuan,China摘要:对黔北地区上奥陶统五峰组烃源岩的有机碳、类异戊间二烯烃、萜烷等有机地球化学特征进行研究.发现具有以下特征:①有机碳含量大于3%,且纵向变化小分布稳定;②有机硫碳比值倾向于高值,平均可达0.1;(~)Pr/Ph比值小于1
3、,具有明显的植烷优势;④伽马蜡烷指数大于0.15;⑤8”C<一30%o,普遍偏轻;@Ts/(Tm+Ts)4J[在0.;36l,--0.518之间,平均为0.455。这些特征均指示研究区五峰期的有机物产率高,同时具有有利于有机质保存的还原环境。对比岩性及有机地球化学剖面,认为晚五峰期有机质保存条件优于早期,中五峰期上升洋流活跃。关键词:五峰组;有机地球化学;上升洋流;还原环境中图分类号:P534.42;P593;P618.130.2文献标志码:A文章编号:1671—2552(2012)11-1922-06LinJS,XieY,LiuJQ,ZhaoZ,JingXY,LuoY.Org
4、anicgeochemicalcharacteristicsofhydrocarbonsourcerocksinup-perOrdovicianWufengFormationofnorthernGuizhonandtheirpaleo-environmentalsignificance.GeologicalBulletinofChina,2012,31(11):1922-1927Abstract:BasedonastudyofsuchorganicgeochemicalcharacteristicsofhydrocarbonsourcerocksinnorthernGuizho
5、uasorganiccarbon,isoprenoidalkenesandterpanes,theauthorshavefoundthattheyhavethefollowingcharacteristics:@TOC>3%,anditslon—gitudinaldistributionisstable;②thevalueofS/TOCisveryhigh,withanaverageofO.1;⑧thePr/Phratioislowerthan1.0,whichshowsanobviousdominanceofphytaneinisoprenoids;thegammaceran
6、eindexishigherthan0.15;@theg13Cislowerthan一30%0;⑥theTs/(Tm+Ts)ratiorangesfrom0.361to0.518,withanaverageof0.455.Thesecharacteristicsindicateabundantsourcesofor-ganicmatterandareductionenvironment.Furthermore,acomparisonbetweenlithologicalandorganicgeochemicalprofilesindifer—entareasshowsthatt
7、hepreservationconditioninthelatestageofWufengPeriodwasbetterthanthatoftheearlystage,andthattheupwellingwasactiveinthemiddlestageofWu~engPeriod.Keywords:WufengFormation;organicgeochemistry;upwelling;anoxicenvironment上奥陶统五峰组炭~硅质泥岩在上扬子黔北从沉积学、岩石学、岩石地球化
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