Method for Analyzing the Molecular and Carbon Isotope Composition of Volatile Hydrocarbons (C₁–C₉) in Natural Gas

Figure 7

Relationship between the carbon isotope ratios and desorption times of each hydrocarbon. 1, Methane; 2, ethane; 3, propane; 4, isobutane; 5, n-butane; 6, isopentane; 7, n-pentane; 8, methyl cyclopentane; 9, 2-methylpentane; 10, n-hexane; 11, methyl cyclohexane; 12, 2/3-methylhexane; 13, n-heptane; 14, benzene; 15, n-octane; 16, methylbenzene; 17, n-nonane; 18, p-xylene.