天然气脉冲式二次运移过程

The process of pulse secondary migration of natural gas

从宏观上看,天然气在运载层中的运移是加速运移过程;从微观上看,天然气运移属于脉冲式运移过程.脉冲式运移的形成机理:一是由气水密度差造成的气柱高剩余压力间歇式突破运移阻力引起的;二是由间歇式构造变动所造成的断层或裂缝形成运移通道引起的.根据天然气加速运移与脉冲式运移形成机理,提出天然气在运载层中运移与聚集的全过程表现为加速式与脉冲式交替运移过程.

From a macro point of view,natural gas migration is to accelerate the migration process in reservoir layer,but the micro level,gas migration is pulse migration process.There are two mechanisms about the pulse formation migration,one is high residual pressure caused by the density difference between gas and water column,the pressure break through the resistance in batch-type,and the gas migrate in the pulse migration,the second is due to intermittent faults or cracks opening caused by tectonic,and the gas migrate by the faults or cracks in pulse migration.According to accelerate the migration of natural gas migration and the pulse formation mechanism,the model of natural gas migration in the reservoir layer is proposed,i.e.,the whole process of natural gas migration and accumulation is a process of accelerated and pulsed alternating migration.