在剖析川西坳陷深层上三叠统须家河组天然气成藏地质特征的基础上，利用储层容积法对川西坳陷中段上三叠统须家河组的天然气资源量进行了计算。研究结果表明，川西坳陷中段深层须家河组成藏地质条件优越，且蕴藏着丰富的天然气资源。须家河组具有很好的生烃条件，烃源岩具有厚度大、分布广、有机质丰度高、品质好、生气量巨大的特点。须家河组内低孔渗、非均质储集岩发育，砂岩储层主要集中发育于须家河组二段和须家河组四段，而须三段和须五段的泥页岩分布广、厚度大、岩性稳定，分别构成了须二段和须四段气藏的直接区域盖层。须家河组内圈闭发育、类型多样，生、储、盖配置关系良好。经计算，川西坳陷中段须家河组的天然气资源量为5 431.2×10⁸ m³，具备形成大中型气田的物质基础，勘探前景良好。其中，绵竹—盐亭近东西向隆起的东西两段、龙门山前缘的区域性陡坡以及坳陷东侧的缓坡带均为有利的油气运移聚集带。

On the basis of the analysis of natural gas geological factors of Upper Tertiary Xujiahe Formation in the middle part of West Sichuan Depression, the gas resources are calculated by reservoir volumetric method. The research results show that the reservoir formation conditions are superior and there are rich gas resources. The Xujiahe Formation has good hydrocarbon\|generating conditions, its source rock is characterized by big thickness, wide distribution, high organic matter abundance, good quality and large gas generating amount. The reservoir rock has low porosity and low permeability and obvious heterogeneity. The sandstone reservoirs mainly lie in the second and the fourth members of Xujiahe Formation, their direct regional caprocks are the third and fifth members of mud shale, respectively and they have wide distribution, big thickness and stable lithology. Trap is abundant and its type is varied in the Xujiahe Formation. There is a good association of source, reservoir and cap rocks. The natural gas resource of Xujiahe Formation in the middle part of west Sichuan depression is 5431.2 hundred million cubic meters. There is material base for forming large to middle gas fields and there are great exploring prospects. The east and west sections of the almost latitudinal direction uplift from Mianzhu to Yanting, the regional slope of the Longmen mountain front and the gentle slope of the east part of the depression are the favourable zones for oil and gas migrating and accumulating.
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