| Based on the experiment of SEM, FESEM and NMR, and combined with the experiment of N2 gas adsorption and isothermal adsorption of methane, the control factors of adsorption capacity of Silurian Longmaxi Shale in Pengshui area, Southeast Chongqing, were discussed. It is shown that organic matter pores and clay mineral pores are mainly developed in shale. The meso-pores account for about 73.5% of shale pore, and the micro-pores and macro-pores account for 13.4% and 13.1% respectively. The meso-pores(2~5nm) make major contribution to the pore volume. The pore structure of shale is irregular, mostly made up of slit pores parallelling the palte of structure. It is concluded that organic matter content is a key factor to control the development of shale pore and the adsorption capacity. There is a weak correlation between shale pore and mineral composition. The adsorption capacity of shale has a positive correlation with specific surface area, pore volume and organic matter content. And it also has a weak positive correlation with clay mineral content and has a weak negative correlation with brittle mineral content. |
