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运用自行设计的天然气运移物理模拟装置，研究天然气在运移过程中所发生的组分分异和碳同位素分馏特征，目的是了解天然气在不同疏导层运移过程中所发生的组分及同位素变化规律。实验结果表明，天然气在运移过程中发生了比较明显的成分色层效应和碳同位素分馏现象，粘土矿物对天然气中重烃组分具有较强的束缚能力，甲烷碳同位素对运移条件及过程较为敏感。本项模拟实验对进一步认识天然气运移过程中组分和碳同位素变化机理具有重要意义。

PHYSICAL MODELING TESTS AND RESULTS OF NATURAL GAS MIGRATION

The characteristics of the component differentiation and carbon isotope fractionation of natural gas occurring in the process of migration were studied by applying a gas migration physical modeling device designed by the authors themselves,so as to see the changes in component and isotope in the process of gas migration along different carrying beds.The test results indicated that the composition chromatographic effect and isotopic fractionation phenomenon took place in the process of gas migration;clay minerals had more powerful binding force to the heavy compenents in natural gas;and methane carbon isotope was relatively sensitive to the migration condition and process of natural gas.Such a modeling test is of great importance to understand further the mechanism of the changes in component and carbon isotope in the process of natural gas migration.