通过对油砂山地区露头油藏圈闭特征、流体性质和地层压力分析，结合油气成藏过程，查明该区地质特征、形成机制和主控因素。油砂山地油层（组）分布受潜水面控制，原油物性由浅至深逐渐变好，产层呈明显低压；油气藏形成经历圈闭发育期、油气充注期和油藏调整-聚集期，具“持续充注、晚期成藏”特征。此过程中深部充足油源是成藏的物质基础，优质储层是油气储集的必要条件，断裂-超压联控是油气运移的关键，后期构造改造为油气分布的主导因素。%Through analyzing the oil trap characteristic, pore fluid properties and formation pressure, combined with hy-drocarbon accumulation research, the geological characteristics, formation mechanism and main control factors of Yoush-ashan outcrop oil reservoir were found out. The results showed that the distribution of oil layers closely tied with water table and crude oil property was progressively better from shallow to deep and formation pressure was lower than hydro-static pressure. It showed that the formation of oil reservoir has experienced three major stages including accumulation preparation, oil charge and hydrocarbon adjustment–accumulation. In addition, for the oil accumulation, affluent oil source in deep is the material foundation, good reservoir rock is necessary condition, overpressure-fault control is the key factor and tectonic reworking in later stage is the dominant factor to oil distribution.
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