The deep coal-measure gas, including coalbed methane (CBM), tight gas (TG) and shale gas (SG), has attracted widely attention because of its great potential for natural gas development and multiple benefits. To determine the gas origin, migration and evolution in the west of Linxing block, 56 coal-measure gas samples from different horizons and depth were collected. The gas components and stable isotope compositions were measured, and the results show that methane is the main composition of coal-measure gas, distributed between 78.83% and 96.67%. The average carbon dioxide and nitrogen concentrations are 1.99 and 1.56 vol %, respectively. Coal-measure gas has apparent dry and wet gas coexist characteristics, with drying coefficient values ranging from 0.821 to 0.989. The δ¹³C(CH₄) and δD(CH₄) are between −41.81‰ and −26.65‰ and −224.1‰ to −180.5‰, with an average value of −36.23‰ and −206.5‰, respectively. The coal-measure gas in the study area is mainly coal-type gas mixed with a small amount of oil-type gas. The gas origin is mainly thermogenic, and in Benxi Formation and Taiyuan Formation there is inorganic CO₂ due to the magma intrusion. The vertical and lateral migration processes of natural gas were observed controlled by dynamic isotope fractionation effect and migration fractionation effect. Based above results, two types of reservoir forming modes of natural gas, i.e., “near-source reservoir-forming mode” and “lower-source rock generation, upper-reservoir storage mode” were established. The process of gas accumulation has experienced four evolution stages. The comparative analysis of our data with that of other previously reported study fields, permit a more robust evaluation of the geochemistry, origin, migration, and evolution of deep coal measures gas in this area.

包括煤层气（CBM），致密气（TG）和页岩气（SG）在内的深部煤系气因其巨大的天然气开发潜力和多重利益而受到广泛关注。为了确定临兴地块以西的天然气成因，运移和演化，共收集了56个煤层气样品，这些样品来自不同的水平和深度。测量了气体成分和稳定的同位素组成，结果表明甲烷是测煤气的主要组成，分布在78.83％至96.67％之间。平均二氧化碳和氮气浓度分别为1.99和1.56体积％。测煤气具有明显的干气和湿气并存的特征，干燥系数范围为0.821至0.989。的δ ¹³ C（CH ₄）和δD（CH ₄）分别在-41.81‰和-26.65‰之间以及-224.1‰和-180.5‰之间，平均值分别为-36.23‰和-206.5‰。研究区的煤系气主要为煤系气与少量石油系气混合而成。气源主要为热成因，本溪组和太原组存在无机CO _2。由于岩浆侵入。观察到天然气的垂直和横向运移过程受动态同位素分馏效应和运移分馏效应的控制。基于以上结果，建立了天然气的两种成藏模式，即“近源成藏模式”和“下源岩成藏，上层储藏模式”。气藏过程经历了四个演化阶段。通过对我们的数据与以前报道的其他研究领域进行的比较分析，可以对该地区深部煤系气的地球化学，成因，运移和演化进行更可靠的评估。