广安气田是目前川中地区在上三叠统须家河组发现的最大气田,由于其地质条件特殊,对该气田天然气的成藏机理和富集条件一直认识不清。根据大面积成藏的定义,结合广安气田的地质特征,认为广安气田具有大面积成藏的特征。从气田烃源岩和储层的结构、气层分布特征、裂缝与气藏分布的关系以及包裹体的测试分析入手,认为大面积成藏的主要条件为平缓构造背景下,源储的大面积间互;有效储层的分布范围控制了气层的分布,构造起伏与裂缝发育有利于气层的分布与产能的提高;煤系地层的吸附解析机理和平缓构造造成晚期构造抬升是大面积成藏的重要条件。这一认识与前人关于构造抬升对油气成藏不利的观点不同,将增加抬升区油气成藏的资源潜力。 The Guangan gas field is the largest gas field in the Upper Triassic Xujiahe Formation in the Central Sichuan Basin. Due to its special geological conditions, the gas accumulation mechanism and enrichment conditions of this gas field have not been fully understood. According to the definition of large-area accumulation and the geological characteristics of Guang’an gas field, it is considered that Guang’an gas field has the characteristics of large-area accumulation. Beginning with the structure of gas source rocks and reservoir, the distribution of gas reservoirs, the relationship between fractures and gas reservoir distribution and the analysis of the inclusions, the main conditions for large-area accumulation are the large area of ​​source reservoirs The distribution of effective reservoirs controls the distribution of gas layers and the fluctuation of structures and fractures are conducive to the distribution of gas layers and the increase of productivity. The adsorption and analysis mechanism of coal strata and the gentle tectonic uplift make it a large area Important condition of possession. This understanding is different from the predecessors’ view that tectonic uplifting is unfavorable to hydrocarbon accumulation, which will increase the resource potential of hydrocarbon accumulation in the uplift zone.