煤层气分布状态主要受控于两种地质效应:一种是热动力学机制控制下的同位素分馏效应,存在于煤层气生成期;另一种是甲烷δ13C1解吸-扩散-运移效应,存在于煤层气生成后,源于埋深变浅而造成的泄压条件下。文中以沁水煤层气田为例,探讨了沁水煤层气田煤层气δ13C1解吸-扩散-运移效应。认为可以利用煤层气δ13C1特征来评价煤层气保存条件和开采稳定性,指导煤层气田的勘探和开发。 The distribution of CBM is mainly controlled by two geological effects: one is the isotopic fractionation under the control of the thermodynamic mechanism and exists in the CBM generation period; and the other is the methane δ13C1 desorption-diffusion-migration effect, which exists in the After the formation of CBM, it is caused by the pressure relief caused by the shallowing of the buried depth. This paper takes Qinshui coalbed methane as an example to discuss the effect of desorption, diffusion and migration of δ13C1 on CBM in Qinshui coalbed gas field. It is considered that CBM δ13C1 characteristics can be used to evaluate CBM storage conditions and mining stability and guide the exploration and development of CBM fields.