Multi-stages tectonic movements, tectonic inversion, intense denudation and the frequent volcano activity made the sophistication of Mesozoic strata and structures, the variety of lithology and the low degree of prospecting in Fulin Sag.In order to identify the law of oil and gas accumulation, firstly we distinguish the type of Mesozoic reservoirs in Fulin Sag is “ new bed-generating and old bed-storing oil reservoirs “ by the analysis of oil source condition; secondly, based on the statistical study of physical properties, the reservoir heterogeneity is definitely caused by the various lithology, weathering crust and faults, and we realize the weathering crust and tuff and sandstone near the faults are the favorable reservoirs;and finally, started from the characteristic, which is the Mesozoic reservoirs located near the unconformity and faults, combined with the results that there is no abnormal high pressure in Mesozoic, we detect that the unconformity, faults and microcrack system are the main migration pathways of Mesozoic oil reservoirs.Based on the research of the law of hydrocarbon accumulation, according to the differences of spatial extension of reservoir and source rock respectively, and the differentiation in the characteristics of hydrocarbon migration, we propose the accumulation model, including “above the source”, “beside the source” and “under the source” to conduct the hydrocarbon exploration in Mesozoic. All this above will provide a new thinking for the study of the law of oil accumulation, and enrich the model of oil accumulation inFulin Sag.%富林洼陷中生界经历多期次构造运动及构造反转过程，地层遭受多期强烈剥蚀，火山活动频繁，导致本地区中生界地层与构造发育情况复杂，储层岩性多样，勘探程度较低。为明确油气成藏规律以指导中生界的勘探，首先从油源条件入手明确富林洼陷中生界为新生古储型油藏，之后在物性统计的基础上研究不同岩性和风化壳及断层导致的储层非均质性，明确了风化壳和断层附近的凝灰岩和砂岩为有利储层，最后从本地区中生界油藏的现今分布于不整合和断层附近的特征出发，结合中生界地层压力没有异常高压的研究结果，明确了不整合与断裂、微裂缝体系是中生界油藏形成的的主要运移聚集条件。在成藏规律研究的基础上根据油气藏与烃源岩的空间展布关系及油气运移特征的不同，提出了源上成藏模式，源侧成藏模式，源下成藏模式以指导中生界的油气勘探。对富林洼陷中生界油气成藏规律提供了新的思路，丰富了油气成藏模式的类型。
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