北黄海盆地I号坳陷中生代地层厚度大、埋藏深、分布稳定,成藏条件较好;研究中生代地层圈闭特征对阐明I号坳陷成藏要素组合特征、油气聚集规律、寻找目标构造和布置勘探井位具有重要意义。通过地球物理研究和区域地质分析,在北黄海I号坳陷中生代地层中识别出了2大类、3亚类等5种圈闭类型,指出这些圈闭的特征是:①以构造圈闭为主;②圈闭构造高点无明显偏移;③平面上按类型分布明显;④形成期次较集中;⑤背斜、断背斜圈闭及部分断鼻状圈闭成藏条件较好。

The depth of Mesozoic strata of I depression in northern Yellow Sea Basin was great and the strata imbedded deep.Its distribution was steady and the condition of hydrocarbon accumulation was better.The research of trapping characters of Mesozoic strata was importantly significant in clarifying the character of the play of I depression,the law of oil/gas accumulating,the searching of objective structure and the collocation of exploration well location.By the researching synthetically of physical geography and the analyzing of regional geology, we identified 2 kinds, 3 subkinds and  5 types of trapping in the Mesozoic strata. Their characters are as follows:①  the main trapping type was the structure trapping; ②there was little excursion  of highest point of trapping structure was; ③on the plane the distribution was  obviously controlled by the type;④the forming periods are concentrative.⑤the c ondition of hydrocarbon accumulation of anticlines trapping, faulted anticlines  trapping and parts of faulted nose trapping was good. 