苯基取代多苯环化合物的成熟度指示意义&mdash;&mdash;以柴达木盆地西部古近系&mdash;新近系烃源岩为例

张明峰，邹红亮，冯备战，张小军，吴陈君,陈 茹,妥进才

doi:10.11764/j.issn.1672-1926.2013.05.975

天然气地球科学 >

2013 , Vol. 24 >Issue 5: 975 - 981

DOI: https://doi.org/10.11764/j.issn.1672-1926.2013.05.975

天然气地球化学

苯基取代多苯环化合物的成熟度指示意义——以柴达木盆地西部古近系—新近系烃源岩为例

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1.中国科学院地质与地球物理研究所，中国科学院油气资源研究重点实验室，甘肃兰州730000；
2.中国石油天然气股份有限公司新疆油田公司勘探开发研究院地球物理研究所，新疆乌鲁木齐 830013；
3.甘肃省地质调查院，甘肃兰州 730000；4.中国石油勘探开发研究院西北分院，甘肃兰州 730020

张明峰（1979-），男，甘肃兰州人，副研究员，博士，主要从事地球化学和油气地球化学研究. E-mail：zhangmingfeng_9@hotmail.com.

收稿日期: 2013-04-16

修回日期: 2013-05-28

网络出版日期: 2013-10-10

基金资助

国家自然科学基金项目（编号：41103022）；中国科学院西部行动计划项目（编号：KZCX2-XB3-12）；中国科学院重要方向项目（编号：KZCX2-EW-104）联合资助.

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The Isomeric Composition of the Phenyl-polyaromatic Hydrocarbons and Its Implications forThermal Evolution of Organic Matter：A Case Study of Source Rocks in Western Qaidam Basin

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1.Key Laboratory of Petroleum Resources Research，Institute of Geology and Geophysics，Chinese Academy of Sciences,Lanzhou 730000,China;2.Geological Research Institute,Research Institute of Exploration and Development,Xingjiang Oilfield Company,PeeroChina,Urumqi 830013,China;3.Geological Survey of Province Gansu,Lanzhou 730000,China;4.Northwest Branch,Research Institute of Petroleum Exploration and Development,PetroChina,Lanzhou 730020,China

Received date: 2013-04-16

Revised date: 2013-05-28

Online published: 2013-10-10

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摘要

通过对柴达木盆地西部古近系—新近系半咸水—咸水湖相烃源岩，及其热模拟实验固体残渣抽提物色谱质谱联用仪（GC-MS）分析，在样品的芳烃馏分中均检测到苯基取代三环芳烃化合物，三联苯（TrP）和苯基萘（PhN）系列，分别为邻位三联苯（o-TrP）,间位三联苯（m-TrP）和对位三联苯（p-TrP）；一位苯基萘（1-PhN）和二位苯基萘（2-PhN）。实验观察三联苯和苯基萘系列中不同取代位置的同分异构体相对含量，与烃源岩的热演化程度有一定关系。在低熟样品中o-TrP和1-PhN含量较高，随着成熟度的增加，m-TrP、p-TrP和2-PhN相对含量增加。可以总结出m-TrP>p-TrP>o-TrP及2-PhN >1-PhN的热稳定序列，并将三联苯异构体相对含量参数TrP1=p-TrP/o-TrP、TrP2=(m-TrP+p-TrP)/o-TrP和苯基萘异构体相对含量参数PhNR=2-PhN/1-PhN与镜质体反射率（R_O）作对比，发现它们之间有很好的正相关性（R_O=0.47%~1.32%），尤其是在烃源岩处于成熟—高成熟热演化阶段，常规生物标志化合物成熟度参数[C₂₉αα-20S/(20S+20R)\,C₃₁αβ-22S/(22S+22R)\,MPI1]失去指示效应，TrP1,TrP2和PhNR仍然具有指示意义。

关键词： 柴达木盆地西部; 烃源岩; 多苯环化合物; 三联苯; 苯基萘; 热演化参数

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张明峰，邹红亮，冯备战，张小军，吴陈君,陈茹,妥进才 . 苯基取代多苯环化合物的成熟度指示意义——以柴达木盆地西部古近系—新近系烃源岩为例[J]. 天然气地球科学, 2013 , 24(5) : 975 -981 . DOI: 10.11764/j.issn.1672-1926.2013.05.975

Abstract

Source rocks from a Tertiary inland lake in the Qaidam Basin (west,China) were analysed for aromatics using capillary gas chromatography-mass spectrometry (GC-MS).The triaromatic members of the new series,phenylnaphthalenes (PhNs) and terphenyls (TrPs),are found in different types of source rocks.The isomeric composition of phenylnaphthalenes and terhenyls was found to depend on thermal maturity.In the samples with lower maturity abundances of 1-PhN and o-TrP are higher.Increase in sample maturity is indicated by an increase in the relative abundance of 2-PhN as well as m-TrP and p-TrP.Three thermal maturity parameters of the organic matter based on the relative abundances of the PhN and TrP isomers are proposed: PhNR=2-PhN/1PhN,TrP1=p-TrP/o-TrP,and TrP2=(m-TrP+p-TrP)/o-TrP.In general their values are positively correlated with vitrinite reflectance (R_O) in a range of 0.47%-1.32%,While correlation of the conventional biomarker maturity parameters (C₂₉ ααα sterane -20S/(20S+20R),C₃₁αβ hopane 22S/(22S+22R),MPI1 ratio) are less apparent with vitrinite reflectance (R_O) in a range of 0.92%-1.32%.So the new parameters perhaps are effective reflecting degree of thermal evolution of organic matter in the mature-highly mature stage.

Key words： The western of Qaidam Basin; Source rocks; Phenyl-polyaromatic hydrocarbons; Phenylnaphthalenes; Terphenyls; Maturity indices

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