天然气地球科学

• 天然气地球化学 • 上一篇    下一篇

四川盆地须家河组天然气碳、氢同位素特征及其指示意义

于聪,龚德瑜,黄士鹏,吴伟,廖凤蓉,刘丹   

  1. 1.中国石油勘探开发研究院,北京  100083;
    2.中国石油天然气集团公司油气地球化学重点实验室,北京  100083
  • 收稿日期:2013-09-16 修回日期:2013-12-30 出版日期:2014-01-10 发布日期:2014-01-10
  • 通讯作者: 于聪yucongcong1234@163.com. E-mail:yucongcong1234@163.com.
  • 作者简介:于聪(1987-),女,吉林长春人,博士研究生,主要从事天然气地质与地球化学研究. E-mail:yucongcong1234@163.com.
  • 基金资助:

    国家自然科学基金项目(编号:41272166)资助.

Geochemical Characteristics of Carbon and Hydrogen Isotopes for the Xujiahe Formation Natural Gas in Sichuan Basin

YU Cong,GONG De-yu,HUANG Shi-peng,WU Wei,LIAO Feng-rong,LIU Dan   

  1. 1.Research Institute of Petroleum Exploration and Development,PetroChina,Beijing 100083,China;
    2.Key Laboratory of Petroleum Geochemistry,China National Petroleum Corporation,Beijing 100083
  • Received:2013-09-16 Revised:2013-12-30 Online:2014-01-10 Published:2014-01-10

摘要:

四川盆地须家河组天然气的干燥系数、甲烷碳同位素、乙烷碳同位素和甲烷氢同位素在平面上具有相似的分布特征,即“西高东低、北高南低”。在纵向上,干燥系数和甲烷碳同位素有随深度变浅而变小(低)的特点,与须一段、须三段和须五段烃源岩的演化特征一致,说明须家河组天然气都属于就近运移成藏。川西须家河组天然气碳同位素出现了部分倒转现象,天然气碳同位素的倒转可能与高—过成熟演化、多期天然气充注以及煤系烃源岩中煤和暗色泥岩生气贡献率不同有关。海相成因天然气的氢同位素值高于陆相成因天然气,氢同位素值高于-160‰的天然气基本为海相成因,而低于-160‰为陆相成因,同时,氢同位素也受成熟度的影响。

关键词: 四川盆地, 须家河组, 碳同位素, 氢同位素

Abstract:

The natural gases in Upper Triassic Xujiahe Formation in the Sichuan Basin are characterized by the tendency of “high in the west and north;low in the east and south” in dry coefficients,methane and ethane carbon isotopes,and methane hydrogen isotopes.The dry coefficients and the methane carbon isotopes increased with the burial depth,and it is similar to the thermal evolution of source rocks of Members 1,3,and 5 of Upper Triassic Xujiahe Formation.It is revealed that the natural gases in Xujiahe Formation were accumulated near the source rocks.Natural gases shown as partial reversal of carbon isotope series of alkane gases in the western Sichuan Basin may be due to mixing of gases from different from high to very high mature coal and dark mudstone at different periods.Results show that the hydrogen isotope values become heavier with the changes of depositional environment from terrestrial to marine,as well as with thermal maturity increase of natural gas.The hydrogen isotope values more than -160‰ for methane indicate that the source rock would be deposited in the marine environment,vice versa,it is terrestrial environment.
 

Key words: Sichuan Basin, Xujiahe Formation, Carbon isotopes, Hydrogen isotopes

中图分类号: 

  • TE122.1+13

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