论文部分内容阅读
根据气藏中天然气的扩散原理，分析了扩散参数的可变性，详细讨论了天然气体积分数和扩散系数的确定方法。将天然气扩散模块加入盆地模拟系统，可以动态模拟古扩散参数的演化，恢复天然气扩散史。对松辽盆地侏罗系天然气扩散的模拟计算表明，扩散系数随盖层的地质条件而变化，烃源岩作为盖层时，对天然气的扩散具有显著的封闭作用，可以有效地阻止天然气的扩散，有利于气藏的保存。
According to the diffusion principle of natural gas in gas reservoirs, the variability of diffusion parameters is analyzed, and the determination methods of gas volume fraction and diffusion coefficient are discussed in detail. Adding natural gas diffusion modules into the basin simulation system can dynamically simulate the evolution of paleo-diffusion parameters and restore the history of natural gas diffusion. The simulation calculation of the natural gas diffusion in the Jurassic in the Songliao Basin shows that the diffusion coefficient changes with the geological conditions of the cap rock. When the source rock is the cap rock, it has a significant sealing effect on the diffusion of natural gas and effectively prevents the diffusion of natural gas , Is conducive to the preservation of gas reservoirs.