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对泥炭、褐煤样品进行了高压（0.1～2GPa）、高温（200～800℃）模拟实验，并用微量气体同位素测定系统（GC－C－MS）测定了气态产物的碳同位素值。在400℃的温度条件下，乙烷、丙烷、正丁烷碳同位素值有随压力升高而变重的趋势，并出现了碳同位素局部反序的特征（δ13C2＞δ13C3）；在600℃、1GPa和1．5GPa的温压条件下，甲烷和乙烷的δ13C（PDB）值偏重，分别约为-15．0‰和16．0‰，也重现了δ13C值局部反序的现象（δ13C1＞δ13C2）;在800℃、2GPa的温压条件下，甲烷产物仍然稳定存在。结果说明，压力也是影响样品气态产物演化的重要因素。
The peat and lignite samples were simulated by high pressure (0.1 ~ 2GPa) and high temperature (200 ~ 800 ℃). The carbon isotope values of gaseous products were determined by GC-C-MS. Under the condition of 400 ℃, the carbon isotope values of ethane, propane and n-butane tended to increase with the increase of pressure, and the characteristics of partial reverse carbon isotope (δ13C2> δ13C3) appeared. At 600 ℃, The δ13C (PDB) values of methane and ethane are biased to about -15.0 ‰ and 16.0 ‰, respectively, at 1 GPa and 1.5 GPa, and the phenomenon of partial reverse order of δ13C value is also reproduced (δ13C1 > Δ13C2); at 800 ℃, 2GPa temperature and pressure conditions, the methane product is still stable. The results show that pressure is also an important factor that influences the evolution of gaseous products.