油气藏的形成机制和分布规律比较复杂,在勘探上具有高难度和高风险的特点。本文通过对埕北凹陷沙三段进行调研,并综合前人的研究成果,论述了凹陷沙三段的地质特征和油气藏特征,认为油气藏成藏主要取决于岩性圈闭、烃源岩分布及输导体系等因素,对油气藏勘探具有重要理论意义与现实意义。 The formation mechanism and distribution law of oil and gas reservoirs are complex and have the characteristics of high difficulty and high risk in exploration. Based on the investigation of the third member of Shahebei depression, and based on the previous research results, the paper discusses the geological characteristics and reservoir characteristics of the third member of the depression. It is considered that the hydrocarbon accumulation mainly depends on lithologic traps, source rocks Distribution and transmission system and other factors, the exploration of reservoirs has important theoretical and practical significance.