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首页> 外文期刊>Science in China. Series D, Earth sciences >Carbon isotope characteristics, origin and distribution of the natural gases from the Tertiary salty lacustrine fades in the West Depression Region in the Qaidam Basin
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Carbon isotope characteristics, origin and distribution of the natural gases from the Tertiary salty lacustrine fades in the West Depression Region in the Qaidam Basin

机译：柴达木盆地西部凹陷地区第三系盐湖相天然气的碳同位素特征，来源和分布

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摘要

The Tertiary in the West Depression Region of the Qaidam Basin has the typical inland salty lacustrine deposits in China. 34 natural gas samples were collected from 13 oil fields in the West Depression Region in the basin, the chemical compositions and carbon isotopes of methane, ethane, propane, and butane were measured. According to the carbon isotope characteristics of natural gases in combination with geochemical characteristics of the source rocks and crude oils, the natural gases can be divided into sapropelic associated gas, mixed organic matter-derived associated gas, coal-derived gas and mixed gas. The carbon isotope characteristics, origin and distribution of the natural gases are considered to be related with the types and distribution of organic inputs in lake environments with different salinities. The lake salinity can regionally forecast the distribution of the different genetic types of natural gas. Compared with the different genetic types of natural gas from other Chinese basins, the carbon isotopes of the heavy hydrocarbons of the natural gas from the Tertiary salt lacustrine facies in the Qaidam Basin are extremely heavier. Therefore, this should be considered when natural gases are genetically classified in the basin.
机译：柴达木盆地西部De陷区的第三纪是中国典型的内陆咸湖相沉积物。从该盆地西部凹陷地区的13个油田收集了34个天然气样品，测量了甲烷，乙烷，丙烷和丁烷的化学成分和碳同位素。根据天然气的碳同位素特征，再结合烃源岩和原油的地球化学特征，可将天​​然气分为腐泥土伴生气，有机质衍生混合气，煤衍生气和混合气。碳同位素特征，天然气的起源和分布被认为与盐度不同的湖泊环境中有机物输入的类型和分布有关。湖泊的盐度可以区域性地预测天然气的不同遗传类型的分布。与其他中国盆地不同的天然气成因类型相比，柴达木盆地第三级盐湖相的天然气中的重烃的碳同位素非常重。因此，在盆地中对天然气进行遗传分类时应考虑这一点。

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