黔西地区高煤阶煤岩吸附特征及控制因素研究

Adsorption Characteristics and Its Influencing Factors of High Rank Coal in Western Guizhou

煤岩的吸附能力决定了煤层气的储量丰度,也影响着煤层气井的产量,是煤层气评价最基本的重要参数。依据大量煤岩样品的实验结果和理论分析,研究了高煤阶煤岩的吸附能力、特征以及影响因素。黔西高煤阶煤岩的兰氏体积和兰氏压力偏低,层间差异大,低压阶段吸附量所占比例高。通过单因子分析法分析各参数对吸附能力的影响;通过灰色关联法分析,确定了各因素对煤岩吸附能力的影响程度。各因素影响关系的确定为煤层气评价参数的选择提供了理论依据。

The adsorption ability of coal is the most basic and important parameter for coal-bed methane（CBM）evaluation,which decides the CBM reserves abundance,and also affects the production of CBM wells.On the basis of the experiment and theoretical analysis by a large number of coal samples,the paper studied the adsorption ability,the adsorption characteristics and its influencing factors of high rank coal.The study found that the Langmuir volume and Langmuir pressure of high rank coal in western Guizhou is low,the differences between coal layers is big,and the adsorption proportion at low pressure stage is high.Influence on adsorption capacity from different factors have been determined through the analysis method of single factor.Through the gray relational analysis method,it also determined the factors＇ impact degree on the absorption ability of the coal.Influence relations provides theory basis for the evaluation of CBM.