实验测定了在压力 2 0 0 0 k Pa和 670 0 k Pa条件下 ,含有甲烷、乙烷、丙烷和异丁烷等典型组成的天然气其水合物的生成焓。实验所用水合物是在微分扫描量热仪里直接生成 ,且在指定的压力下进行恒压温度扫描 ,同时测定水合物中的水气比和生成焓。其误差小于 1 .5 %。实验结果表明 ,在不同的实验压力条件下 ,水合物的生成焓与水气比变化较小 The enthalpies of formation of natural gas hydrate with typical composition of methane, ethane, propane and isobutane under the conditions of pressure 2 0 0 0 Pa and 6 0 0 0 Pa were measured experimentally. Hydrates used in the experiment were generated directly in a differential scanning calorimeter and were scanned under constant pressure and temperature at the specified pressure. The water vapor ratio and enthalpy of formation in the hydrate were also determined. The error is less than 1.5%. The experimental results show that under different experimental pressure conditions, the formation enthalpy of hydrate and water vapor ratio change less