The hydrocarbon accumulation conditions in the Huanghekou depression are analyzed in this paper, using the latest high-resolution 3D seismic and well logging, combined with the core observation information, from the source rock, reservoirs, reservoir-seal assemblage, traps type and carrier systems. The results show that source rocks are general in the Huanghekou depression, and there develop three sets of hydrocarbon source rocks, and the 3rd Member of the Shahejie Formation and the 3rd Member of the Dongying Formation are the major source rocks. The main reservoir includes Cenozoic clastic reservoir and bedrock reservoir. The main types of source-reservoir-cap rock assemblages include lower-generation middle-accumulation and upper-cap rock, upper-generation lower-accumulation and upper-cap rock, indigenous generation and accumulation. The trap types are mainly fault block traps, and faults dominate the carrier system in the vertical direction. The influence of Neotectonic Movement on the Huanghekou depression brings favorable conditions for the Neogene hydrocarbon accumulation, and the late fault activity plays roles of preservation and secondary distribution of the formed reservoirs. Major reservoirs in the plane are around oil-generating depressions with a zonal distribution in the structural belt. Paleogene reservoirs are in zonated distribution around the eastern sag. The Neogene majorly is in "T"-shaped distribution. Hydrocarbon accumulates from the periphery to the center, from south to north, from the Paleogene to the Neogene in the Huanghekou depression.%利用最新高分辨率三维地震资料、测井录井等资料,结合岩心观察信息,从烃源岩、储集层、生储盖组合、圈闭类型和输导体系5个方面对黄河口凹陷油气成藏条件进行了系统分析.研究表明,黄河口凹陷烃源岩在整个凹陷普遍发育,共有3套烃源岩,其中沙河街组三段和东营组三段是主力烃源岩；主要的储集层是新生界碎屑岩储层和基岩储层；生储盖层组合模式有下生中储上盖式、上生下储上盖式和自生自储式；圈闭类型以断块圈闭为主；输导系统以断裂的垂向疏导为主；新构造运动对黄河口凹陷的影响是新近系油气聚集的优越条件,晚期断裂活动对已形成油气藏起到保存和二次分配的作用.油气藏分布在平面上主要环绕生油洼陷呈环带状分布于洼陷周边的构造带中,古近系油气主要围绕东部次洼呈环带状分布,新近系主要呈“T”字形分布,从古近系到新近系油气有由周边向中间、由南向北聚集的特征.
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