摘要
天然气碳、氢同位素组成是研究天然气成因和来源最直接、有效的方法。四川盆地中坝气田主要产气层为上三叠统须家河组二段和中三叠统雷口坡组三段,但关于中三叠统雷口坡组三段气藏的气源目前还存在争议。因此,对中坝气田天然气碳、氢同位素组成以及轻烃和凝析油组分碳同位素特征进行了研究,同时分析了四川盆地不同层位天然气氢同位素特征并与之进行对比,结果表明中坝气田须家河组天然气显示出典型的煤成气特征,而雷口坡组天然气则显示油型气特征。结合该区烃源岩条件认为,须家河组天然气属须家河组自生自储,雷口坡组天然气来源于下伏二叠系碳酸盐岩。
Carbon and hydrogen isotopes of natural gas are the most direct and effective tools to distinguish gases origins. There are two main natural gas pay zones in the Zhongba Gasfield, Member 2 of the Upper Triassic Xujiahe Formation （T3x2） and Member 3 of the Middle Triassic Leikoupo Formation （T2/3） of which the gas source remains controversial. In this paper,we measured the carbon and hydrogen isotopes of natural gas as well as carbon isotopes of light hydrocarbons and condensates from the T3x2 and the T213 gas producers in the Zhongba Gasfield. In order to comparison,we also analyzed the hydrogen isotopes of gases from other gas producers in the Sichuan Basin. The results show that gases from the T3x2 are sourced from the Xujiahe Formation coals while gases from the T2/3 are sourced from the Permian sapropelic carbonates in consideration of the distribution of source rocks in this area. Key words ： Carbon isotope ; Hydrogen isotope ; Zhongba Gasfield ; Gas-source correlation
出处
《天然气地球科学》
EI
CAS
CSCD
北大核心
2014年第1期79-86,共8页
Natural Gas Geoscience
关键词
碳同位素
氢同位素
中坝气田
气源
Carbon isotope
Hydrogen isotope
Zhongba Gasfield
Gas-source correlation
