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首页> 外文期刊>The electronic journal of geotechnical engineering >Geochemical Characteristics of Natural Gas from Yangtake- Yudong2-Quele Structural Belt in Kuqa Depression, Tarim Basin,NW China
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Geochemical Characteristics of Natural Gas from Yangtake- Yudong2-Quele Structural Belt in Kuqa Depression, Tarim Basin,NW China

机译：塔里木盆地库车De陷阳竹-玉洞2-地构造带​​天然气的地球化学特征

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This paper is to probe into the origin and maturity of Tertiary and Cretaceous natural gas samples from the Yangtake-Yudong2-Quele structural belt in Kuqa Depression of Tarim Basin, NW China, based on the analyses of the molecular and stable isotope compositions. The chemical composition data of 22 samples reveals that the gases mainly consist of hydrocarbon gas(exceed 95% often), lower heavy hydrocarbon gas contents(11.4% on average), and an average drying coefficient of about 88.39%, representing typical wet gas. Non-hydrocarbon gases in them, low in content, are mainly nitrogen and carbon dioxide, with nitrogen content much higher than carbon dioxide content. The stable carbon isotopes of 7 samples indicate alkane carbon isotope is heavy, especially of δ 13 C 2+ （δ 13 C 2 ＞-28‰）; with the increase of carbon number, the carbon isotope gets heavier, basically indicating the positive carbon isotope series of organic origin gas. The phenomenon of weak inversion of heavy hydrocarbon isotopes is common, probably caused by the mixing of gases of ‘same source but different stages’ or ‘same stage but different sources’. By contrast methods and 3 classic graphic plates, the genetic type of the natural gas on the research belt is identified as humic pyrolysis gas, derived from thermal degradation of type Ⅲ kerogen. The vitrinite reflectance of the natural gas is between 1.01%-1.07%, calculated by the formula of δ 13 C 1 -Ro and inferred by Δ(δ 13 C 1 -δ 13 C 2 ) index. Compared with the published gas data from the Kelasu belt located in the northern depression, the natural gas of Yangtake are wetter (lower dry coefficient) and lighter (lighter carbon stable isotope), affected by the distance from the depression center and maturity.
机译：本文通过对分子和稳定同位素组成的分析，探讨了中国塔里木盆地库车De陷Yangtake-Yudong2-Quele构造带第三纪和白垩纪天然气样品的来源和成熟度。 22个样品的化学成分数据表明，这些气体主要由烃类气体组成（经常超过95％），重烃类气体含量较低（平均为11.4％），平均干燥系数约为88.39％，代表了典型的湿气。其中的非烃气体含量低，主要是氮气和二氧化碳，其中氮气含量远高于二氧化碳含量。 7个样品的稳定碳同位素表明烷烃碳同位素很重，尤其是δ13 C 2+（δ13 C 2＞ -28‰）;随着碳原子数的增加，碳同位素变重，基本上表明有机源气的正碳同位素系列。重烃同位素的弱反演现象很常见，可能是由“相同来源但不同阶段”或“相同阶段但不同来源”的气体混合引起的。通过对比方法和3个经典图形板，研究带上天然气的遗传类型被确定为腐殖质热解气体，其源于Ⅲ型干酪根的热降解。天然气的镜质体反射率在1.01％-1.07％之间，通过δ13 C 1 -Ro的公式计算并通过Δ（δ13 C 1-δ13 C 2）指数推断。与来自北部depression陷的克拉苏带的已发布天然气数据相比，杨竹的天然气较湿（干系数较低）和较轻（碳稳定同位素较轻），受距depression陷中心和成熟度的距离影响。

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