For the shallow traps in Yinggehai Formation, the main reason for episodic injection of fluid a with different gas components is the matching of trap formation and hydrocarbon generation in Miocene.

• 在莺歌海组浅层底辟圈闭中，圈闭形成期与中新统气源岩生烃过程的匹配是造成含不同天然气组分的流体发生幕式充注的主要原因。