摘要
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。
Based on the diffusion principle of natural gas in gas reservoir, this paper analyzed the variability of diffusion parameters, discussed in detail the determination method of volume fraction and dif fusion coefficient of natural gas. In addihon, it is presented that the basin simulator with natural gas diffusion module can be used to simulate the evolution of ancient dmsion parameters, and reconsstruct the natural gas diffusion history. The case study over natural gas dchsion of Jurassic in Songliao basin showed that the diffusion coefficient varies with geologic condihons of caprock.The source rock is a sighficant seal when it acts as caprock, that is, it can effectively prevent natural gas from diffusing.
出处
《新疆石油地质》
CAS
CSCD
1999年第5期383-386,共4页
Xinjiang Petroleum Geology
关键词
天然气
扩散系数
松辽盆地
扩散量
计算法
Natural gas Diffusion Diffusion coefficient Simulation Songliao basin
