摘要:Volcanic reservoir researches of Santanghu basin show that volcanic reservoir has the characteristics of wide distribution scope, longer geologic age span, great thickness change, multiple types of lithology and lithofacies, complex reservoir space and bet-ter effective reservoir properties. Its formation mechanism can be summarized as five types:“alkali under the silicium”,“acidity and alkali”stack dissolution, weathering eluviation, unconformity, fracture reconstruction by factors of tectonic setting, lithology and lithofacies distribution, diagenesis, fluid properties, volcanic institutions and weathering eluviation. The formation of volcanic oil reservoir is affected by combined action of one or several common mechanism, therefore, five modes are concluded. From the six accumulation modes, it is concluded that the volcanic rock effective reservoir distribution has five distribution rules of along the un-conformity with zonal distribution, in the fault zone near the volcanic trap with the developed fracture, attaching to favorable litholo-gy and lithofacies distribution, inside the weathering eluviation zone formed of volcanic mechanism and in the“alk and acidity”stack dissolution layer.%三塘湖盆地火山岩储层研究表明:火山岩储层具有分布范围广、时代跨度大、厚度变化大、岩性岩相类型多、储集空间复杂、有效储层物性较好等特征。其形成受构造作用、岩性岩相展布、成岩作用、流体性质、火山机构、风化淋滤等因素控制;其形成机理可概括为上硅下碱、“碱性+酸性”叠加溶蚀、风化淋滤、不整合、断裂改造等5种类型。火山岩储层的形成可受其中一种或几种机理共同作用,得出5种模式。从总结出的该区火山岩油气藏6种成藏模式中得出火山岩有效储层分布具有沿不整合呈带状分布、在断裂带附近裂缝发育的火山岩圈闭中、依附有利的岩性和岩相分布、在火山机构形成的风化淋滤带内、在“碱性+酸性”叠加溶蚀层段内的5点分布规律。