中文摘要：

以湘中南龙潭组黑色页岩为研究对象,探明湘中南地区地区龙潭组黑色页岩孔隙发育特征及其影响因素,同时分析孔隙特征对于页岩气成藏的作用。压汞实验可以测试微米级孔径发育情况,低温氮吸附试验可以研究纳米级孔径发育特征,通过压汞实验、低温氮吸附实验测试,对比分析了两种实验条件下的页岩孔隙结构特征,并且探讨了孔隙发育的发育控制因素及其对页岩气成藏的意义。研究认为,龙潭组黑色页岩孔隙结构复杂,主要由纳米孔组成;孔隙多呈开放性,以两端开口圆筒形和四边开放的平行板状的透气性孔为主要类型。退汞效率在31.45%~63.82%之间,平均51.94%,说明样品的孔隙和喉道的尺寸大小相对均匀,孔喉均一性比较好。纳米孔平均介于（5~30）nm,占总孔体积的94.74%,对比表面积的贡献达到98.08%。脆性矿物含量较高,为有机碳和粘土矿物之外控制页岩孔隙发育的重要因素。纳米孔隙对气体的吸附能力较强,甲烷分子以结构化方式存在其中。研究结果表明,研究区页岩孔渗发育较好,较高的脆性矿物含量有利于页岩气后期开采,湘中南龙潭组黑色页岩具备良好的页岩气勘探开发潜力。

英文摘要：

A study on black shale of Longtan Formation in Central and South Hunan was presented. Using mer- cury injection experiment and nitrogen adsorption method, the pore structure characteristics were contrast analyzed, influenced factors and its impact on reservoir-forming was discussed at the same time. The results show that, the pore structure of the shale of Longtan Formation is complex, which is composed of nanopores, pores are open in style and mainly consist of the cylinder pores with two ends open and parallel-plate pores with four sides open. The efficiency of mercury with drawal ranges between 31.45% -63.82% , 51.94% on average, which shows pores uniformity is good. The sizes of nanopores are in a range of （5 -30） nm, which take up 94.74% of the total vol- ume of pores and 98.08% of specific surface area. Brittle mineraX content is high, which is an important factor to influence pores. The nanopores have a strong ability to absorb gas, methane molecule exist in it in a structured way.