Large scale of lithological traps was developed at the background of regional gentle structure. 在盆地区域平缓的构造背景下,发育了大型岩性圈闭,具有广阔的勘探前景。
Combined traps related with faults have a larger scale, then structurally formed ones. In most cases, "gas potato" could be discovered within the lithologic traps, and their distribution is probably controlled mainly by sedimentary micro facies. 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。
After Neogene period, the trap scale is enhanced by reformation and new traps came into being at the same time. 晚第三纪以来,盆地受到强烈改造,圈闭幅度得到加强,并形成了新的圈闭。