| 天然气中稀有气体同位素 |
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| 引用本文： | 徐永昌,王先彬,吴仁铭,沈平,王有孝,何永平.天然气中稀有气体同位素[J].地球化学,1979(4):271-282. |
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| 作者姓名： | 徐永昌 王先彬 吴仁铭 沈平 王有孝 何永平 |
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| 作者单位： | 中国科学院兰州地质研究所
(徐永昌，王先彬，吴仁铭，沈平，王有孝)，中国科学院兰州地质研究所(何永平) |
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| 摘 要： | A hundred natural gas samples of different geological.periods collected from various localities were determined for their nitrogen,helium and argon contents,as ,weil as the isotopic composition of argun. The range of Ar^40/A^36 ratio was found to be 305--9255. The helium-argon chronological formula for calculating natural gas age was corrected. Based upon the chronological accumulation effect of Tadiogenic argon-40, an argon-40-argon-3-6 cmpirical formula for calculating natural gas age has been proposed. It can be seen from the ratio of nitrogen to atmospheric argon that most of nitrogen in these natural gases could not be derived from atmospheric nitrogen,but elsewhere.The range of radiogenic He/Ar^40 turns out to be 5.19 to 23.18 with the range betwwen 7 to 14 for most samples.The He/Ar^40 ratios of Sinian samples are in the range of 5.39 to 6.14,indicating their deep derivation from the earth.It should be noted that the Ar^40/Ar^36 ratio shows a general trend of approaching the atmospheric value from the Sinian to the Tertiary Period,or from old to young in geological age,mirroring,to a great extent,the evolutionary tendency of the rare gas isotopic composition of natural gases with the continuous degassing of the earth.
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| 关 键 词： | 天然气 稀有气体同位素 气体丰度 同位素组成 |
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