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
Received date: 2004-02-12
Revised date: 2004-02-25
Online published: 2004-04-20
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。
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
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.
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