At last, the main trap manifested by the structure evolution in the area is not structural trap, but lithological trap, ancient landform trap and combination trap.

• 本区的构造演化过程表明本区主导圈闭不是构造圈闭，而是岩性圈闭、古地貌圈闭及二者联合作用组成的复合圈闭。