彬长大佛寺井田低煤阶煤层气直井产气差异性评价

大佛寺井田内4号煤组属低煤阶煤组，煤储层物性较好，煤层气资源丰富，然而井田内煤层气直井产气效果差异性较大。在研究煤储层参数特征的基础上，结合煤层气直井地面开发的实践，运用模糊数学方法，构建了4口工程参数一致、产气差异较大的煤层气直井储层各参数的评价隶属函数，通过计算评价值对4 上煤和4号煤储层进行了综合评价，评价结果与实际煤层气产能情况一致，即DFS-133和DFS-45井储层有利于地面煤层气开发，DFS-69和DFS-105井储层不利于地面煤层气开发。基于4口直井4号煤组煤层气储层的综合评价，认为在储层强化措施一致的情况下，井田内煤层气直井产气效果主要受储层资源因素、保存因素和开发因素3方面的控制。同时，研究结果对大佛寺井田4 上煤的煤层气勘探开发及选区具有重要的地质意义。 

Difference evaluation of vertical CBM well production in Dafosi mine field of Binchang mining area

The group 4 coal seam in the Dafosi mine filed belongs to the low rank coal, and the coal reservoir has good physical properties and abundant CBM resources, however, the gas production of the vertical wells is rather different. Based on the characteristics of coal reservoir parameters and the practice of CBM ground development, fuzzy mathematics was used to set up the membership function of reservoir parameters of 4 vertical CBM wells with the same engineering parameters and a big difference in production. Reservoir has been evaluated and the result was consistent with actual production. Specifically, reservoirs uncovered by wells DFS-133 and DFS-45 are conducive to development, reservoirs penetrated by wells DFS-69 and DFS-105 are not. After comprehensive assessment of reservoirs of seam group 4 in 4 vertical CBM wells, it can be concluded that resource, preservation and development factors are influence factors of productions of the vertical wells with same strengthening measures. The conclusion has significant meaning for CBM development and selection of favorable area of upper seam 4.