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在分析天然气扩散系数影响因素的基础上 ,根据天然气在岩石中扩散系数与其在水中扩散系数之间对应函数关系及天然气在水中扩散系数随温度的变化关系 ,建立了一种天然气古扩散系数的恢复计算方法 ,并将其应用于松辽盆地昌德气藏泉一、二段泥岩盖层天然气古扩散系数的恢复计算中 .由于该方法考虑了岩石饱和介质、岩石物性等地质因素的影响 ,校正后的天然气扩散系数大于实验室实测天然气扩散系数 ,更符合客观地质条件
Based on the analysis of the influencing factors of natural gas diffusion coefficient and according to the relationship between the diffusion coefficient of natural gas in rock and its diffusion coefficient in water and the variation of diffusion coefficient of natural gas in water with temperature, And apply it to the calculation of the ancient diffusion coefficient of natural gas in mudstone caprock of Changde gas reservoir in Changde gas pool of Songliao Basin.Because of the influence of geological factors such as rock saturated medium and petrophysical properties, After the natural gas diffusion coefficient greater than the laboratory measured natural gas diffusion coefficient, more in line with the objective geological conditions