天然气地球化学

凌源—宁城盆地牛营子坳陷侏罗系海房沟组烃源岩芳烃地球化学特征及其地质意义

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  • 1.长江大学资源与环境学院,油气资源与勘探技术教育部重点实验室,湖北 武汉 430100;
    2.沈阳地质矿产研究所,中国地质调查局沈阳地质调查中心,辽宁 沈阳 110034
唐友军(1975-),男,湖北荆州人,副教授,博士,主要从事油气地球化学研究.E-mail:309378729@qq.com.

收稿日期: 2018-08-15

  修回日期: 2018-10-25

  网络出版日期: 2019-04-02

基金资助

国地质调查局项目“松辽外围南部盆地群油气基础地质调查”(编号:DD20160167);中国石油科技创新基金项目(编号:2017D-5007-0105);国家自然科学重点基金项目(编号:41730424)联合资助.

The aromatic fraction of source rocks from the Jurassic Haifanggou Formation in Niuyingzi Depression of Lingyuan-Ningcheng Basin

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  • 1.College of Resources and Environment,Key Laboratory of Exploration  Technologies for Oil and Gas Resources,Ministry of Education,Yangtze University,Wuhan 430100,China; 2.Shenyang Institute of Geology and Mineral Resources /Shenyang Center of Geological Survey,China Geological Survey( CGS),Shenyang 110034,China

Received date: 2018-08-15

  Revised date: 2018-10-25

  Online published: 2019-04-02

摘要

基于凌源—宁城盆地牛营子坳陷侏罗系海房沟组13个烃源岩抽提物中芳烃馏分的GC—MS分析,结果表明:侏罗系海房沟组烃源岩中均检测到1,2,5-三甲基萘、卡达烯、联苯、蒽、苝等陆源高等植物来源的化合物以及部分低等生物来源的[XC草字屈.tif]和苯并藿烷等化合物,反映出海房沟组烃源岩有机质主要来源于陆源高等植物,少量低等生物贡献,并且在302.0m以浅的烃源岩中卡达烯/菲、联苯/菲、蒽/菲等值相对较高,反映出浅部烃源岩中陆源高等植物贡献更为充足。此外,三芳甾烷系列、三芴系列、苯并藿烷系列和脱羟基维生素E系列分布特征表明302.0m以浅的烃源岩形成于偏氧化的淡水沼泽相环境,302.0m以深的烃源岩则形成于弱氧化—弱还原的淡水—微咸水环境;芳烃中烷基萘参数(DNR、TNR、TMNr、TeMNr)、烷基菲参数(MPI1)、三芳甾烷参数[C28TAS-20S/(20R+20S)]、二苯并噻吩参数(MDR)、苯并藿烷分布特征以及脱羟基维生素E系列参数(β-MTTC/γ-MTTC)均反映海房沟组烃源岩处于低成熟阶段且深部与浅部成熟度相近,深部略高于浅部。

本文引用格式

唐友军, 郑磊, 李永飞, 郜晓勇, 宗文明, 孙求实, 何大祥 . 凌源—宁城盆地牛营子坳陷侏罗系海房沟组烃源岩芳烃地球化学特征及其地质意义[J]. 天然气地球科学, 2019 , 30(3) : 433 -446 . DOI: 10.11764/j.issn.1672-1926.2019.10.024

Abstract

The aromatic fraction of thirteen source rock samples from the Jurassic Haifanggou Formation in Niuyingzi Depression of Lingyuan-Ningcheng Basin were analyzed by gas chromatography-mass spectrometer(GC-MS).The aromatic hydrocarbon molecular compounds in the source rocks shallower than 302.0m are distinctly different from that in the source rocks deeper than 302.0m in the Haifanggou Formation of the Well Niu D1.The 1,2,5-trimethylnaphthalene,cadalene,biphenyl,anthrance,perylene,chrysene and dibenzoforan have an obvious distribution in all source rocks of the Jurassic Haifanggou Formation,which indicate a significant terrigenous high plant input and a small amount of lower biological contributions.However,the shallow source rocks contain relatively higher values of cadalene/phenanthrene,biphenyl/phenanthrene and anthrance/phenanthrene ratios than those of the deep source rocks,reflecting that the shallow source rocks have more abundant terrestrial higher plants than the deep source rocks.The distributions of triaromatic steranes,fulorenes,dibenzothiophenes and dibenzoforans,benzohopanes and dehydroxyl-vitamin E indicate that the shallow source rocks were deposited in the swamp environment with relatively oxic condition and freshwater water,whereas the deep source rocks are formed in lacustrine environment with suboxic condition and freshwater to brackish water.In addition,various measured maturity-related indicators in aromatic fraction,including DNR,TNR,TMNr,TeMNr,MPI1,C28TAS-20S/(20R+20S),MDR and β-MTTC/γ-MTTC,as well as the distribution of benzohopanes,show that the Haifanggou Formation just have entered early oil generation stage,and the maturity level of deep source rocks is slightly higher than shallow source rocks.


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