Dynamic analysis of gas formation revealed that the resisting force for the capillary tubes in the Upper Paleozoic reservoir was so high that it prevented the remigration of gas.

• 含气范围内的同一气层连通性较差，气水分布受区域构造控制，局部明显存在边底水，也没有整体活塞式气驱水作用形成的区域性气水界面。