从烃源岩、储集层、圈闭、油气运移及富集条件等方面入手，对子长油田成藏地质特征进行了研究。认为子长油田延长组油气生成及油气初次运移条件均较好，但储层、油气二次运移及富集条件相对较差。延长组主要有五种油藏类型，油气分布主要受储层物性、岩性、岩相等条件所控制。 Starting from the aspects of source rocks, reservoirs, traps, hydrocarbon migration and enrichment conditions, the geological characteristics of hydrocarbon accumulation in Zichang Oilfield have been studied. It is considered that the conditions for oil and gas generation and initial migration of Yanchang Formation in Zichang Oilfield are good, but the secondary migration and accumulation conditions of reservoirs and oil and gas are relatively poor. There are mainly five types of reservoirs in Yanchang Formation. The distribution of oil and gas is mainly controlled by reservoir physical property, lithology and rock facies.