非烃天然气:氮气

塔里木盆地天然气中氮气成因与油气勘探风险分析

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  • (中国科学院广州地球化学研究所,广东 广州 510640)
刘朝露(1968-),男,江西莲花人,博士研究生,主要从事天然气地球化学研究.

收稿日期: 2004-11-19

  修回日期: 2005-01-16

  网络出版日期: 2005-04-20

THE GENESIS OF MOLECULAR NITROGEN OF NATURALGASES AND ITS EXPLORATION RISK COE FFICEIENT IN TARIM BASIN

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  • (Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Gu angzhou  510640, China)

Received date: 2004-11-19

  Revised date: 2005-01-16

  Online published: 2005-04-20

摘要

氮气( N2 )是天然气中最常见的非烃组分之一。天然气中的N2 依其成因与来源特征总体可分为大气来源、与生物作用有关的来源和与岩浆活动有关的地壳深部或地幔来源等。根据天然气中氮的赋存状态和一些地球化学特征,并结合塔里木盆地的火山活动史,对塔里木盆地天然气中氮气成因机理进一步综合分析后认为:在白垩系以上(浅部)的油气藏内,天然气中氮的平均含量低于5 % ,主要以大气来源为主,勘探风险较低;对于白垩系以下至志留系(中部)的油气藏来说,天然气含氮量平均为2 0 .3% ,来源较复杂,以混源(深部源和生物作用来源)为主,勘探风险居中;对于奥陶系以下(深部)的油气藏,天然气中氮含量离散度较大,最低为2 .8% ,最高达5 5 .3% ,低氮来源以生物作用为主,高氮来源以地壳深部火山活动或结晶基底来源为主,勘探风险相对较大。

本文引用格式

刘朝露夏斌 . 塔里木盆地天然气中氮气成因与油气勘探风险分析[J]. 天然气地球科学, 2005 , 16(2) : 224 -228 . DOI: 10.11764/j.issn.1672-1926.2005.02.224

Abstract

Molecular nitrogen is one of most common non-hydrocar bon components in natural gas reservoirs. The origin of molecular nitrogen in na tural gas can be classified to be three types, according to its origin, that is,  atmospheric nitrogen resource, bio-genesis resource and deep crust and upper- mantle resource correspondingly. Based on the nitrogen preserve, distribution an d some geochemistry properties, and combined with the volcanic history of Tarim  basin, the genesis of molecular nitrogen in natural gas has been comprehensively  analyzed in the paper. The study shows:① the gas pool in the shallow part (suc h as Cretateous), the average relative abundance of nitrogen is lower 5 percent,  and its main origin is from atmospheric nitrogen, and its exploration risk coef ficient is relatively lower;② the middle part (such as Carboniferous, Permian),  its origin of nitrogen is relatively complex, which main resource is from the d eep mantle or bio-genesis. The average relative abundance of nitrogen is about  20 percent, and its exploration lies in between; ③ the deep part gas pool (such  as Ordivician), the average relative abundance of nitrogen is variable, thepoor
-nitrogen gas pool, its main resource is from bio-genesis, while the rich-nit rogen gas pool, its main resource is from the deep mantle and is related with th e metamorphic rock, its exploration risk coefficient is relatively higher.

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