The sequence of oil oil/gas gas reservoir formed successively from the Shahejie to Minghuazhen formations of Neocene age.

• 与断层有关的复合圈闭形成的气藏往往规模较大,构造圈闭次之,岩性圈闭大多形成规模较小的“气土豆”,其分布主要受沉积微相控制。