下扬子皖江地区古生界中上二叠统富有机质页岩是区域潜在的页岩气有利目标层，过去对其内部孤峰组、龙潭组和大隆组的比较研究较少。为评价这三个组的页岩气勘探潜力，优选勘探层系，根据钻井岩芯和露头岩样的地化、岩石学分析数据及野外调查等资料，通过地质-地球化学方法综合研究了中上二叠统富有机质页岩特征。结果表明：皖江地区中上二叠统富有机质页岩在热演化程度差别较大，有机质热演化程度由东向西逐步升高，平面上具有东北部成油，西南部成气的特征；其中孤峰组和大隆组富有机质泥页岩地层在皖江地区分布广、厚度较大、有机质丰富和热演化程度适中，具有形成页岩气的良好物质基础，而且页岩有机质孔、无机质孔隙和微裂缝发育，油气显示活跃；其中大隆组页岩有机质类型以Ⅱ2和Ⅲ型为主，普遍进入高成熟演化阶段，页岩气勘探潜力高于龙潭组和孤峰组，埋深适中，泥页岩与硅质岩伴生，利于人工压裂，有较大勘探潜力。但皖江地区后期发生多期强烈构造运动，对早期形成的页岩气藏有一定破坏作用，寻找相对构造稳定区是下一步油气勘探的关键。

The Middle-Upper Permian organic-rich shales of Paleozoic in Wanjiang area of Lower Yangtze are potential targets for shale gas in the region, but there are few comparative studies on Gufeng Formation, Longtan Formation and Dalong Formation in the past. In order to evaluate the shale gas exploration potential of these three groups and optimize the exploration strata, the characteristics of organic-rich shale of the Middle-Upper Permian Series were comprehensively studied by means of geological-geochemical methods based on the geochemical and petrologic analysis data of drilling core and outcrop samples and field investigation. The results show that the degree of thermal evolution of organic-rich shales in the Middle-Upper Permian in Wanjiang area is quite different, and the degree of thermal evolution of organic-rich shales gradually increases from east to west. The organic-rich mud shale formations of Gufeng and Dalong formations are widely distributed, thick, rich in organic matter and moderate in thermal evolution in Wanjiang area, which have a good material basis for shale gas formation, and organic pores, inorganic pores and micro-fractures are developed, showing active oil and gas. The organic matter types of Dalong formation are mainlyⅡ2 and Ⅲ, which generally enter the stage of high maturity evolution. The exploration potential of shale gas is higher than that of Longtan Formation and Gufeng Formation, and the burial depth is moderate, mud shale is associated with silicic rock, which is conducive to artificial fracturing, and has great exploration potential. However, several periods of strong tectonic movement occurred in the late Wanjiang area, which had a certain destructive effect on the shale gas reservoir formed in the early stage.