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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。
Natural gas carbon and hydrogen isotope composition is the most direct and effective method to study natural gas origin and origin. The main gas producing layer of the Zhongba gas field in Sichuan Basin is the third member of the Upper Triassic Xujiahe Formation and the Middle Triassic Leikoupo Formation. However, the gas source of the third member of the third member of the Leikoupo Formation in the Middle Triassic There are still controversies. Therefore, the carbon isotopic composition of natural gas and the carbon isotopic composition of light hydrocarbon and condensate oil in the Zhongba gas field were studied, and the characteristics of hydrogen isotopes of natural gas in different layers of the Sichuan Basin were analyzed and compared. The results show that the dam The natural gas in the Xujiahe Formation in the gas field shows typical characteristics of coal-formed gas while the natural gas in the Leikoupo Formation shows the characteristics of oil-type gas. According to the source rock conditions in this area, the natural gas in Xujiahe Formation belongs to Xujiahe Formation and the natural gas in Leikoupo Formation originates from underlying Permian carbonate rocks.