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沁水盆地南部是我国煤层气勘探开发的最热点地区,在我国率先实现了煤层气开发的商业化。煤层气开发的主要目标为3号煤层和15号煤层,单井产气量一般在2 000~5 000 m3/d之间,注入/压降试井测试煤层渗透率多在1.0×10-3μm2左右。在对不同区块煤层气井生产数据分析的基础上,借助历史拟合的方法对试井测试的煤层渗透率进行修正,修正后的煤层渗透率为(0.47~3.95)×10-3μm2,是试井测试渗透率的6.76倍,修正后的渗透率与煤层气井产气量呈正相关关系。综合分析认为沁水盆地南部煤层渗透性优越,潘庄—端氏一带煤层渗透性最好。
The southern part of the Qinshui Basin is the hottest spot for CBM exploration and development in China. It took the lead in realizing the commercialization of CBM development in China. The main targets of CBM development are No. 3 coal seam and No. 15 coal seam. The gas production in single well is generally between 2 000 and 5 000 m3 / d. The permeability of injection / pressure drop well test is more than 1.0 × 10-3μm2 . Based on the analysis of the production data of coalbed methane wells in different blocks, the coal seam permeability of the well test is corrected by the history fitting method. The corrected coal seam permeability is (0.47 ~ 3.95) × 10-3μm2 Well testing permeability of 6.76 times, the corrected permeability and gas production of gas wells was positively correlated. The comprehensive analysis shows that the permeability of the coal seams in southern Qinshui Basin is superior, and the permeability of Panzhuang-Duanshi coal seam is the best.