煤储层常常通过断层与水文地质系统相连，使得具有矿化度的地下水侵入煤层。为了提高瓦斯抽采量，需要探索不同含水率、不同盐度的煤对CH₄的吸附影响。通过XPS、FTIR等多种实验测试手段，构建了不同含水率、不同盐度的东曲矿8号煤大分子结构模型，进行等温吸附模拟实验，详细分析了不同含水率、不同盐度的煤对CH₄吸附能力的影响。结果表明：CH₄的吸附能力随煤中含水率、盐度的增加而下降；含水率对CH₄吸附的影响大于盐度对CH₄吸附的影响；钠盐影响煤吸附CH₄的能力由大到小排序为Na₂CO₃＞NaHCO₃＞NaCl；静电势分布情况为| Na₂CO₃的静电势|＞| NaHCO₃的静电势|＞| NaCl的静电势|；静电作用力影响吸附强弱，盐中离子的静电势值越大，煤吸附CH₄的能力则越强。

Coal reservoirs are often connected to hydrogeological systems through faults, allowing groundwater with mineralization to intrude into coal seams. In order to improve gas extraction, it is necessary to explore the effect of coal with different moisture content and salinity conditions on CH₄ adsorption. By means of various experimental tests, such as XPS, FTIR, we constructed macromolecular structure models of Dongqu 8^# coal with different moisture content and salinity conditions, conducted isothermal adsorption simulation experiments, and analyzed in detail the effects of coal models with different moisture content and salinity conditions on the adsorption capacity of CH₄. The results showed that the adsorption capacity of CH₄ decreased with the increase of moisture content and salinity in coal; the effect of moisture content on CH₄ adsorption was greater than that of salinity on CH₄ adsorption; the ability of sodium salt to affect the adsorption of CH₄ by coal was ranked from largest to smallest as follows: Na₂CO₃ > NaHCO₃> NaCl; electrostatic potential distribution: | Na₂CO₃ electrostatic potential| > | NaHCO₃ of electrostatic potential| > | NaCl of the electrostatic potential|, it can be seen that the electrostatic force affects the strength of adsorption, the greater the value of the electrostatic potential of the ions in the salt, the stronger ability the coal to adsorb CH₄.