摘要：

黄骅坳陷埕北断坡处于歧口凹陷向埕宁隆起过渡的斜坡带上，发育多个不整合，这些不整合对该区的油气成藏起重要作用。利用地震资料，在剖面上将不整合划分为5种类型：褶皱不整合、断褶不整合、削截不整合、超覆不整合、平行不整合。其中平行不整合分布在凹陷区，褶皱不整合分布在基底，断褶不整合分布在大断裂下降盘，削截不整合分布在大断裂上升盘，而超覆不整合多分布在隆起斜坡区；利用测井资料，在纵向上将不整合划分为3层结构：不整合面之上岩石、风化粘土层及半风化岩石，由于每层结构的岩性与厚度不同，形成ACE型、ADE型、BCE型和BDF型4种岩性配置模式。不整合构成埕北断坡油气侧向运移的重要通道，同时在其之上形成超覆不整合油气藏，在其之下依靠风化粘土层遮挡形成削截不整合与褶皱不整合油气藏。勘探证实，研究区众多油气显示或油气藏均位于不整合面上、下50 m范围内。开展不整合与油气成藏关系研究，将拓宽黄骅坳陷隐蔽油气藏的勘探空间，对我国东部油气资源挖潜具有重要的理论与实践意义。

Abstract:

Abstract The Chengbei fault slope of Huanghua Depression lies in the slope belt between the Qikou Sag and the Chengning Uplift, and develops many unconformities. These unconformities are very important for the hydrocarbon accumulation in this area. By analyses of seismic data, the unconformity can be divided into fold unconformity distributing in the basement, faulted-fold unconformity distributing in the downthrown block of the large rift, truncation unconformity distributing in the upthrown block, onlap unconformity distributing in the slope area of the uplift and parallel unconformity distributing in the sagging area. According to the log data, the unconformities are divided into three parts vertically: rocks developed above the uncoformity, weathered clay layer and semi-weathered clay layer. Because of the differences in thickness and lithology, the vertical textures of unconformity include four patterns of lithology configuration, namely ACE, ADE, BCE and BDF. The unconformities in the Chengbei fault slope are not only the important paths for the oil and gas lateral migration, but also the good places for the petroleum accumulation. Onlap unconformity petroleum reservoirs can be formed above the unconformity, and truncation unconformity petroleum reservoirs can be formed below the unconformity due to the weathered clay layer. The exploration has proved that a lot of petroleum display and petroleum reservoirs are deposited in the 50 m range above and below the unconformities. The researches of relationship between unconformity and petroleum accumulation will broaden the exploration area of subtle reservoirs in the Huanghua Depression and have important academic and practical significances for the further exploration in eastern China basins.