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低熟气是潜在天然气资源极为重要的领域,对其的识别既有重要的理论意义也有重要的实际意义,其鉴别除碳、氢同位素外,轻烃参数是主要的指标.在吐哈盆地采集了20个气样进行了轻烃分析,结果表明,天然气轻烃组分具有高甲基环己烷、高异构烷烃和低苯的特征,这意味着成气母质为典型的腐殖型,古环境为淡水沉积环境,这些特征与盆地的地质背景一致.对异庚烷值、庚烷值和天然气甲烷碳同位素组成等成熟度指标的对比研究说明,吐哈盆地天然气主要是侏罗系煤系在低演化阶段形成的低熟气.母质为Ⅲ型,成熟度处于低演化阶段,这是低熟气最根本的特征.即轻烃的研究结果进一步证实了吐哈盆地是我国的低熟气规模性气区.这对我国低熟气进一步的勘探开发无疑有很好的促进作用.
Low-mature gas is an extremely important field of potential natural gas resources, its identification has important theoretical significance as well as important practical significance, its identification of carbon and hydrogen isotopes, the light hydrocarbon parameters are the main indicators collected in Turpan-Hami Basin Twenty gas samples were analyzed for light hydrocarbon. The results showed that the light hydrocarbon components of natural gas have the characteristics of high methylcyclohexane, high isoparaffin and low benzene, which means that the gas-forming parent material is typical humus and the ancient environment is fresh water Sedimentary environment, and these characteristics are consistent with the basin’s geological background.Comparison of the maturity index of isoheptane, heptane and natural gas methane isotopic composition indicates that natural gas in the Turpan-Hami basin is mainly characterized by low evolution of Jurassic coal measures Stage of low-mature gas.The parent material is type Ⅲ, the maturity is in the low evolution stage, which is the most basic characteristics of low-stoiche.The results of light hydrocarbons further confirmed that the Turpan-Hami basin is China’s low-scale gas scale gas This will undoubtedly promote the further exploration and development of low-grade gas in our country.