中文摘要：

通过分析煤层气的气相及液相吸附特点,论证了煤层气的吸附服从液相吸附规律,讨论了地层原始条件下煤层气的解吸过程,发现其是由气相与液相解吸复合而成的,建立了描述煤层气复合解吸的数学模型.复合解吸受气相解吸、液相解吸以及煤层含水饱和度控制,并存在相转换解吸模式,计算出煤层气复合解吸的静态及动态曲线.研究结果表明：静态曲线表明当煤层含水饱和度由100%减少至60%时,复合解吸量较气相解吸量多36.48%;动态曲线表明在煤层气解吸初期,相转换解吸气量比例为74%;而在解吸晚期相转换解吸气量比例下降至4%.复合解吸同样满足Langmuir规律;早期解吸气的主要来源是由于相转换解吸且解吸量会出现台阶式变化;而在解吸晚期,则主要由气相解吸模式控制,煤层产出气的主要来源是气相解吸和液相解吸.

英文摘要：

By investigating the gas phase and liquid phase adsorption behavior of coalbed methane（CBM）,it is demonstrated that the coalbed methane does belong to liquid phase adsorption.Then the coalbed methane desorption process is explored under the initial reservoir condition,and it is discovered that the desorption process is controlled by both gas and liquid phase desorption and the compound desorption model is established.The compound desorption model is influenced by gas phase desorption,liquid phase desorption and matrix water saturation in coalbed.There also exists phase transform desorption in the compound desorption period.The static and dynamic curves of compound desorption can be plotted by case calculation.The static curves illustrate that the compound desorption can desorb 36.48% more than the gas desorption does when the water saturation changes from 100% to 60%.The dynamic calculation shows that at the early period of desorption,the phase transform desorption proportion is peaking at 74%,and at the late period it falls to 4%.The compound desorption also satisfies the Langmuir regulation,and the main desorption gas comes from phase transform desorption and the desorption volume will have a sudden increase at the start of desorption.Meanwhile,the compound desorption is close to the gas phase desorption during the late desorption period and the main desorption comes from the gas and liquid phase desorption.