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实验过程中发现,对同一铝塑气袋取样装置天然气碳同位素在不同时间分析结果存在较大差别,直接导致天然气类型的划分和气源对比出现多解性。针对这一现象,开展了不同取样装置下天然气碳同位素值随时间变化的实验。结果表明,铝塑气袋天然气样品甲烷碳同位素随时间的增加出现明显的变重现象,乙烷、丙烷碳同位素也存在轻微的变重现象;盐水玻璃瓶和高压钢瓶中天然气甲烷、乙烷、丙烷碳同位素则不随时间发生变化,这一结果对我们正确选择天然气取样装置提出了明确要求,同时也提醒我们在使用碳同位素分析数据时一定要慎重,尽量避免使用铝塑气袋天然气的分析结果,以免造成误导。
During the experiment, it was found that the analysis results of carbon isotopes of natural gas in the same aluminum-plastic airbag sampling device at different times have great differences, which directly leads to the division of natural gas types and the multi-solution of air source contrast. In response to this phenomenon, experiments were carried out on carbon isotope values of natural gas over time under different sampling devices. The results show that the methane carbon isotope of aluminum-plastic air bag increases obviously with the increase of time, and the carbon isotopes of ethane and propane also have a slight weight gain. The natural gas methane, ethane, Propane carbon isotopes do not change with time, the results of our correct choice of natural gas sampling device made clear requirements, but also remind us to use the carbon isotope analysis data must be careful, try to avoid the use of aluminum plastic bag of natural gas analysis results , So as to avoid misleading.