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天然气地球科学 ›› 2000, Vol. 11 ›› Issue (3): 25–34.doi: 10.11764/j.issn.1672-1926.2000.03.25

• 论著 • 上一篇    下一篇

南海北部大陆架Y盆地天然气中N2成因及气源剖析与探讨

何家雄; 李明兴;   

  1. 中国海洋石油南海西部公司勘探开发研究院; 广东 湛江;524057
  • 出版日期:2000-06-20 发布日期:2000-06-20
  • 作者简介:何家雄, 男, 1956 年11月生, 地质师, 主要从事石油天然气勘探及地质地球化学综合研究

N2 ORIGIN ANALYZE IN NATURAL GAS OF Y BASIN IN THE NORTH OF NANHAI, CHINA  

HE Jiaxiong, LI Mingxing   

  1. China Offshore Oil Nan-hai West Corporation, Zhanjiang, 524057
  • Online:2000-06-20 Published:2000-06-20

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摘要：

Y盆地天然气中普遍含有非烃N2和CO2,且N2含量与无机CO2总体呈相互消长关系,而与CH4为主的烃类气正相关。非烃N2依据其含量可划分为低含N2(N2<10％)、含N2(N2=10％～15％)和富(高)N2天然气(N2>15％)等三类,而N2成因则根据其地质地球化学特征及伴生稀有气体同位素特点,可将其综合判识为大气成因、壳源有机成因及壳源有机―无机混合成因等三种成因类型。N2总体分布特征多具有平面上分区分块、剖面上集中富集于400～1600m的浅层或超浅层的特点。N2与CO2及烃类气的共生组合关系,常常具有有机成因的富N2天然气与低含量有机CO2及高含量CH4为主的烃类气伴生,而有机―无机混合成因的低含N2、含N2天然气则多与高含量无机CO2及部分CH4为主烃类气并存的组合特征。很显然,这种共生组合关系决定了N2的成因及气源构成特点。因此,基于N2成因类型及与CO2及烃类气的共生组合关系和分布特征,结合地质地球化学的综合分析研究,可以综合判识N2气源。

关键词: Y盆地, N2成因类型, 氦氩同位素, 气源分析, 综合判识

Abstract:

There contains non-hydrocarbon CO2 and N2 universally in natural gas of Y basin and the N2 content appear negative-correlate with overall of inorganic CO2 and positive-correlate with hydrocarbon gas which mainly is CH4. According to N2 content .natural gas can be divided into three typesjow N2 content(N2<10%) .middle N2 content(N2 = 10%-15%),high N2 content(N2>15%). According to its geology and geochemistry behaviors and characteristics of companion rare gas isotope the origin of N2 can be comprehensively discriminated and determined to three original types:atmospheric origin,shell origin and combination of shell origin of hydrocarbon and non-hydrocarbon. The distribution traits largely possess parti-tioned-area and partitioned-block on plate and concentrated in shallow layer or overshallow of 400-1600m on cross section. The co-existed grouping relation of N2,CO2 and hydrocarbon gas usually include natural gas of high-content N2association with low-content CO2 hydrocarbon gas of hydrocarbon origin and hydrocarbon gas of mainly high-content CH4,and N2nuaural gas of hydrocarbon and non-hydrocarbon combination origin coexisting with high-content CO2 of non-hydrocarbon and partly hydrocarbon gas which mainly is CH4. Obviously this co-existed grouping relation determine the traits of origin and composition of N2. So based on the origin type of N2 and co-existed grouping relation and distribution characteristics of N2, CO2 and hydrocarbon gas, associated with integrated analyzing and researching of geology and geochemistry, the source of N2 can be comprehensive discriminated and determined.

Key words: Y basin, Origin type of N2, He isotope and Ar isotope i Gas source analyze, Comprehensive discrimi-

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