天然气非烃地球化学

塔里木盆地原油氮同位素地球化学初步研究

展开
  • (长江大学地球化学系,湖北 荆州 434023)
陈传平(1956-),男,湖北仙桃人,副教授,在职博士,主要从事有机地球化学研究

收稿日期: 2004-02-12

  修回日期: 2004-02-25

  网络出版日期: 2004-04-20

基金资助

国家自然科学基金项目(编号:49673181)资助

ELEMENTARY RESEARCH ON OIL NITROGEN ISOTOPIC GE OCHEMISTRY IN TARIM BASIN 

Expand
  • (Department of Geochemistry, Yangtze University, Jingzhou 434023, China)

Received date: 2004-02-12

  Revised date: 2004-02-25

  Online published: 2004-04-20

摘要

采用Kjeldahl硫酸消煮法制备了塔里木盆地部分干酪根和原油的氮同位素样品并测定了相关比值,结果显示,油―源的δ15N值之间有一定可比性并随时代和区域不同而变化:塔中奥陶系原油样品的δ15N值最低(多小于1‰);塔北中生界原油样品δ15N值略高,大致在-1‰~1‰之间);库车坳陷原油样品δ15N值较高,但有3种不同情况,一是牙哈构造带原油的δ15N值分布有较大离散度(最大为18.11‰,最小为2.77‰),差值高达15.34‰,二是YH5井奥陶系原油的δ15N值明显低于同一井上覆第三系原油的该值,暗示该井有两种不同源岩的原油发生了部分混合,三是轮南14井不同层位的原油δ15N值在纵向上自下而上逐渐降低,初步表明不同层位的油气发生了垂向运移。

本文引用格式

陈传平,梅博文 . 塔里木盆地原油氮同位素地球化学初步研究[J]. 天然气地球科学, 2004 , 15(2) : 178 -181 . DOI: 10.11764/j.issn.1672-1926.2004.02.178

Abstract

Nitrogen isotopic samples of oils in Tarim basin were prep ared with Kjeldahl method and the ratios were measured. The results show that δ15N values of oil and source rock can be correlated but vary with ge ological age and different tectonic zones. Oil δ15N in Tazhong zone is lo west with most values below 1‰; it has some higher value in Tabei zone but stil l  near zero on the whole. Whereas the δ15N distribution in Kuche zone is d iscrete with value maximum 18.11‰ and minimum 2.77‰,the difference being 15.34 ‰. Oil δ15N in Ordovician formation of YH5 well is lower than that in Te rtiary Formation, which suggests that oil in the zone is a mixer of two differen t sources. Oil δ15N values in different formations of well Lunnan 14 decr ease from bottom to the top reservoir gradually so it is speculated that hydroca rbon migration may have occurred vertically.

参考文献

[1 ] Li M, Larter S R, Stoddart D, et al. Fractionation of py rrolic nitrogen compounds in petroleum during migration: Deri vation of migration-related geochemical parameters [A ]. Cubtt J M,  England W A. The Geochemistry of Reservoirs [C ]. London: The Geological Societ y, 1995.103-124.
 [2 ]  郑永飞,陈江峰.稳定同位素地球化学[M ].北京:科学出版社,2000.248- 259.  
[3 ]  杜建国.天然气中氮的研究现状[J ].天然气地球科学,1992,3(2):36- 40.  
[4 ]  Macko SA, Estep MLF. Microbial alteration of stable nitrogen and carbon isotopic compositions of organic matter [J ]. Org Geochem, 1984,  6:782-790. 
 [5 ]  Reed W E, Kaplan I R. The chemistry of marine petroleum seeps [J ].  J Geochem Expl,1977,7:255-293.
 [6 ]  陈践发,朱岳年.天然气中氮的来源及塔里木盆地东部天然气中氮地球科学特征[J ].天然气地球科学,2003,14(3):172-176.  
 [7 ]  Williams L B, Ferrell Jr R E, Hutcheon I, et al. Nitrogen isoto pe geochemistry of organic matter and minerals during diagenesis and hydrocarbon  migration [J ]. Geochim Cosmochim Acta,1995,59:765-779.
  [8 ]  陈传平,曹亚澄,梅博文.原油氮同位素样品制备及其比值分析 [J ].分析化学,2002,30(5):640.
  [9 ]  陈传平,梅博文.中国不同沉积环境的氮同位素特征 [J ].石油与天然气地质,2001,22(3):207-209.
 [10 ]  陈传平,梅博文.原油运移过程中的氮同位素分馏作用[J ].地球化学,2002,31( 2):201-205.
 [11 ]  张敏,林壬子,梅博文. 油藏地球化学[M ]. 重庆:重庆大学出版社,1997.

文章导航

/