海拉尔盆地乌9井煤含水热模拟生烃实验研究

通过对海拉尔盆地乌 9井煤进行含水热模拟实验 ,结果反映出煤在早期阶段产气率较小 ,且以生成非烃气为主 ,35 0℃后产气率明显增大 ,随模拟温度的增加烃类气体的组分碳同位素序列由正碳序列变为同位素序列倒转 ,说明了温度对天然气的组分碳同位素序列有影响。热模拟煤中可溶有机质表现出低饱和烃和高非烃、沥青质的特点 ,色谱上具有较高的Pr/Ph。煤具有两次生油高峰 :即未熟 低熟油生油高峰 ,对应Ro =0 5 % ,产油率为 0 .85 % ;第二次生油高峰Ro为 0 .85 % ,产油率 0 .93%。煤显微组分组成特征决定了煤的生油特征。

HYDROUS THERMAL SIMULATING EXPERIMENT ON HYDROCARBON GENERATION OF COAL IN HAILAER BASIN

Hydrous thermal simulating experiment was carried out using coal samples (Ro=0.41%) in the Hailaer Basin to describe the hydrocarbon generation characteristics of coal. The result showed the gaseous product is mainly non-hydrocarbon gas before 350℃ and the productivity is very low. The gaseous productivity increases sharply when the temperature is higher than 350℃. With the rise of temperature, the carbon isotopic composition varies from positive sequence to reverse one. The contents of saturated hydrocarbons in the liquid products are relatively low, but non-hydrocarbons and asphaltene are much higher. And they have much high ratios of Pr/Ph in all samples. It also is shown that there are two peaks of hydrocarbon generation, one at Ro=0.5% and the other at Ro=0.85%. It is proposed that the hydrocarbon generating potential of coal depends on the composition of its organic macerals.