Nonassociated gas can be classified as conventional gas accumulation with displacement migration,source-contacting gas accumulation with piston-type migration,and shale gas accumulation with the displacement and piston-type migrations.
游离相天然气主要包括置换式运移并聚集的常规储层气、活塞式运移并聚集的根缘气和兼具上述两种运移模式并具有复杂运聚机理的页岩气等,根据游离相天然气运聚的连续性动力平衡方程可以对不同运聚机理类型的天然气进行成藏描述。
Distinguished by what from traditional conception of fissured shale gas, shale gas is concerned to the gas accumulated within the shales and/or mudstones by free and adsorbed gas.
与传统上的"泥页岩裂缝气"并不完全相同,页岩气是主体上以吸附相和游离相同时赋存于泥岩及页岩地层中的天然气。