鸡西煤田梨树煤矿地面煤层气抽采潜力

梨树煤矿属高瓦斯矿井，矿井瓦斯涌出量大，瓦斯治理形势日趋严峻。为评价梨树煤矿地面煤层气抽采潜力，从评价煤层气地面抽采潜力的关键参数含气量、渗透率入手，采用数值模拟软件CBM-SIM进行产能预测。研究认为，较高含气量的降幅程度及含气饱和度，决定了梨树煤矿主采煤层较好的解吸程度和开发效果。以XX-01井为例，含气饱和度高达99%，含气量降幅可达10.8 m3/t。原生–碎裂结构为主的煤体结构，决定了梨树煤矿主采煤层有较好的渗透性并且储层易改造，增产效果好。产能预测显示，梨树煤矿煤层气直井排采15a，累计产量可达422万m3，且经济效益、安全效益可行。因此，梨树煤矿具有较好地面煤层气抽采潜力。 

CBM surface extraction potential in Lishu mine of Jixi coalfield

Lishu mine is a high-gassy mine with large gas emission, thus the situation of gas control is increasingly severe. For evaluating CBM surface extration potential in Lishu mine, the paper uses numerical simulation software and carries out productivity prediction from 2 key evaluation parameters (gas content, permeability). The result shows that higher decreasing amplitude of gas content and higher gas saturation determine better desorption degree and development effect of the major mined seam. Taking well XX-01 as an example, the gas saturation is as high as 99%, the decreasing amplitude of gas content is as high as 10.8 m3/t. Coal structure (mainly native and cataclastic) determines better permeability of the major mined seam, reservoir is easy to transform and has better fracturing effect, thus resulting in good production-enhancing effect. Productivity prediction shows that the cumulative production of vertical single CBM well is up to 4.22 million m3 during 15 years, and safe and economic benefits are feasible. Therefore, Lishu mine has a good CBM surface extrction potential.