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歧口凹陷为第三纪以来继承发育的大凹陷,四周为凸起所限,自成一个相对独立的构造-沉积单元和油气生成-运移-聚集单元,从而形成一个含油气系统。地球化学资料表明,沙三段和沙一段为区域分布的两套主力生油层,有机质以Ⅱ_1型为主,部分为Ⅰ型。沙三段烃源岩有机质热演化程度较高,油源对比证实沙三段是已发现油气藏的主要油气源。各二级构造带发育多种类型圈闭,有利于形成多含油气层系、多油藏类型相互叠置连片的复式油气聚集带。区带资源评价表明,滩海地区的白东、歧东、埕海等构造带油气资源量较大,油和气分别占凹陷区带总资源量的60％和67％,且勘探程度较低,剩余潜力很大,是今后勘探的有利区带。
The Qikou depression is a large depression inherited and developed since the Tertiary. It is restricted by bulges around it and forms a petroleum-bearing system as a relatively independent tectonic-sedimentary unit and hydrocarbon generating-migrating-aggregating unit. Geochemical data show that the second member of Shahejie Formation and the second member of Shahejie Formation are mainly distributed in the two main oil layers. The organic matter is mainly of type II 1 and partly of type Ⅰ. The source rocks of the third member of the Es9 have a higher degree of organic matter thermal evolution, and the oil source comparison proves that the Es3 member is the major oil and gas source of the discovered oil and gas reservoirs. Various secondary structural belts develop various types of traps, which are favorable for the formation of multiple hydrocarbon accumulation belts with multiple oil-bearing gas layers and multiple reservoir types superimposed on one another. The evaluation of zonal resources shows that the petroleum resources in the Baodong, Qidong, Qionghai and other tectonic belts in the beach area are relatively large with oil and gas accounting for 60% and 67% of the total resources in the depression area, respectively, and the degree of exploration is relatively low. There is a great potential for further exploration and a favorable zone for exploration in the future.