Methane Adsorptivity And Geological Controls Of Coal And Mud Shale In Low-Middle Rank Coal-Measures

This thesis selected brown to fat coal samples and mud shale samples from 12 coal fields as study objects. Through experiments and analyses, the influence of mineral compositions on pore structure and absorption performance is emphatically discussed. The results show that the content of vitrinite(huminite) and exinite(liptinite) doesn’t have obvious correlation with pore structure and langmuir volume, while the intertinite content shows moderate positive correlation with them. The mineral matter has moderate positive relationship with the transition porevolume, surface area as well as langmuir volume which indicates the influence of mineral matter on coal sample permeability and absorption performance.The complicated relationship between TOC content in mud shale and pore structure, aborption perfomance emerges. When TOC content is high, pore volume and surface area have declining trend with the samples maturing, while the langmuir volume increases gradually. When TOC content is low, the maturity shows negative correlation with pore structure and absorption performance.In high TOC mud shale samples, the relationship of clay mineral content and pore structure and langmuir volume is not significant, but when TOC content is low, clay mineral in samples has positive relationship with pore struture and langmuir volume. The slip layer minerals has a opposite trend to kaolinite towards porosity and absorption performance due to the difference of the distribution and content of ground water.