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煤层气以吸附气、游离气、水溶气赋存于煤层中．煤层气的散失首先要发生解吸,然后呈游离气和溶解气再向外散失,散失途径可有3种方式：孔隙中的游离气通过盖层的散失、储盖层烃浓度差引起的分子扩散和溶于水中的气直接被水带走．依据煤层气的保存控制因素,考虑煤层气的上覆盖层(顶板)、下伏隔层(底板)、水文分区和散失原理来建立3种地质模型：封闭系统煤层气散失地质模型、侧向水封系统煤层气散失地质模型和开放系统煤层气散失地质模型．
CBM to adsorbed gas, free gas, water-soluble gas occurs in the coal seam. The desorption of coalbed gas is the first to occur, and then to free gas and dissolved gas and then out to the loss, there are three ways to get lost: the free gas in the pores through the loss of cover, reservoir formation caused by poor molecular diffusion of hydrocarbon concentration And the gas dissolved in water directly taken away by water. According to the control factors of CBM, three kinds of geological models are established considering the overburden of coalbed methane (roof), underlying compartment (floor), hydrological zoning and dissipation principle: the geological model of CBM loss in closed system, lateral water Geological model of coal seam gas loss in seal system and geological model of coal seam gas loss in open system.