歧口凹陷西南缘是构造岩性油气藏发育区，受斜坡背景控制，发育不整合、上倾尖灭、孤立砂体、颗粒灰岩等多种类型构造岩性油气藏，具有良好的勘探潜力。通过剖析歧口凹陷西南缘岩性油气藏成藏条件，对该区油气分布规律与油气成藏模式进行了系统的总结，指出下步岩性油气藏的有利勘探方向，对歧口凹陷今后的油气勘探有一定的借鉴作用。

The southwest margin of the Qikou sag is an area where structural-lithologic reservoirs developed, and they are controlled by slope and characterized by unconformity, updip pinching, isolated sandbody, grainstone carbonate and so on. The exploration potential is great and favorable. This article analyses the formation conditions of the hydrocarbon pools at the southwest margin of the Qikou sag, sums up the hydrocarbon distribution rules and reservoir-forming patterns, and points out a feasible direction for exploring lithlogic reservoirs. Hopefully, the methods which we used in this paper will be helpful for oil fields of Bohai Bay Basin.