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天然气地球科学 ›› 2011, Vol. 22 ›› Issue (4): 709–714.doi: 10.11764/j.issn.1672-1926.2011.04.709

• 天然气地球化学 • 上一篇    下一篇

松辽盆地南部梨树断陷天然气轻烃地球化学研究

 高丽丽, 张敏, 赵红静   

  1. 1.长江大学油气资源与勘探技术教育部重点实验室，湖北 荆州 434023；
    2.长江大学地球化学系，湖北 荆州 434023
  • 收稿日期:2011-05-05 修回日期:2011-06-01 出版日期:2011-08-10 发布日期:2011-08-10
  • 通讯作者: 高丽丽glily5257@163.com. E-mail:glily5257@163.com.
  • 作者简介:高丽丽(1983-)，女，河南南阳人，硕士研究生，主要从事油气地球化学研究.
  • 基金资助:

    国家重大专项“大型油气田及煤层气开发”项目(编号:2008ZX05007-001-01)资助.

Geochemical Characteristics of Light Hydrocarbon in Natural Gas  from Lishu Fault Depression in Songliao Basin

 GAO  Li-Li, ZHANG  Min, ZHAO Hong-Jing   

  1. 1.Ministry of Education Key Laboratory of Exploration Technologies for Oil and Gas Resources,Yangtze University,
    Jingzhou 434023,China;2.Department of Geochemistry,Yangtze University,Jingzhou 434023,China.
  • Received:2011-05-05 Revised:2011-06-01 Online:2011-08-10 Published:2011-08-10

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摘要：

对松辽盆地南部梨树断陷八屋、孤家子、后五家户、皮家等油气田天然气样品的C6—C7轻烃化合物首次开展了系统的地球化学对比研究，结合天然气碳同位素组成特征，认为研究区天然气样品普遍贫芳香烃，绝大多数样品C6—C7饱和烃具链烷烃优势，尤以正构烷烃含量最高，环烷烃含量相对较低，表明该区天然气的母质类型主要为腐泥型；研究区Mango轻烃稳态动力学常数K1基本保持恒定，来自湖相烃源岩的C7轻烃中三环优势(3PR)大于五环优势(5PR)和六环优势(6PR)，与Mango的结论一致。庚烷值、异庚烷值多较高，寓示该区天然气主要为高熟—过熟的裂解气，与该区天然气甲烷碳同位素组成普遍偏重相吻合。

关键词: 梨树断陷, 松辽盆地, 地球化学特征, 轻烃, 天然气

Abstract:

We comparatively studied the geochemical characteristics of C6-C7 light hydrocarbons in natural gas from Lishu fault depression in Songliao basin for the first time.Combined with characteristics of carbon isotope,results showed that natural gas from Lishu fault depression is very poor in aromatic hydrocarbon but rich in chain alkanes.Among the components of C6-7 light hydrocarbon,n-alkanes have the content advantage and naphthenes have the lowest content.The distribution characteristics suggested that the natural gas originated from sapropelic organic matter.The ratio K1 is around 1 and the three\|ring preference (3RP) is greater than 5RP and 6RP in C7 light hydrocarbon from lacustrine facies source [JP2]rocks,which were basically consistent with the conclusion of light hydrocarbons by Mango.The high value of paraffin index and heptane index indicated that the natural gas is mainly pyrolysis gas which coincides with the  high value of δ13C1.

Key words: Lishu fault depression, Songliao basin, Geochemical characteristics, Light hydrocarbon, Natural gas.

中图分类号: 

  • TE122.1+13

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