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利用高精度孔隙度测定仪和气相色谱分析仪 ,采用恒体积法 ,测定了室温 ( 2 83～ 2 92 K)、低压 ( 0 .1 67～ 0 .3MPa)下N2 、CO2 和天然气在 8个不同的岩心孔隙内表面的吸附量 ,对于天然气 ,还测定了吸附前后自由气体的摩尔组成 ,被吸附气体 (吸附相 )的摩尔组成和天然气各组分的相对吸附量。实验结果表明 :用 N2 测得的吸附气量在原始气中所占的比例为0 .4 %～ 4 %不等 ,CO2 的为 1 %～ 5%不等 ,天然气的为 3%～ 6%不等 ;吸附前后自由天然气的摩尔组成有显著的差异 ,表明岩心对天然气有明显的吸附 ;天然气各组分间存在竞争吸附 ,重质组分的相对吸附量大于轻质组分。
Using high-precision porosimetry and gas chromatography, constant volume method was used to determine the effect of N2, CO2 and natural gas at room temperature (2 83 ~ 2 92 K) and low pressure (0 1 67 ~ 0 .3 MPa) For different natural gas, the molar composition of free gas before and after adsorption, the molar composition of adsorbed gas (adsorbed phase) and the relative adsorption amount of each component of natural gas were also measured. The experimental results show that the amount of adsorbed gas measured by N2 accounts for 0.4% -4% of the original gas, 1% -5% of CO2 and 3% -6% of natural gas Etc. The molar composition of free natural gas before and after adsorption showed significant differences, indicating that the core adsorbed natural gas obviously. There existed competitive adsorption between natural gas components, and the relative adsorption amount of heavy components was larger than that of light components.