Large lithologic traps had developed in Dongying formation of the western slope of Qikou depression where the degree of prospecting is low and the exploration potential is big.

• 摘要歧口凹陷西斜坡东营组各层段发育大型岩性圈闭，勘探程度低、勘探潜力大，是滩海区重要的后备勘探战场。