基于生产数据分析的沁水南部煤层渗透性研究

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。

Study of Permeability of Coal Seam Based on Data Well Production in South Qinshui Basin

The south Qinshui basin is one of the most hot areas in the coalbed methane (CBM) exploitation and the first commercial exploitation of CBM in China. No 3 and No 15 coal seams is the developed seam of CBM, with gas production of 2 000~5 000 m³/d for single well. The permeability is generally about 1.0×10^-3μm² by input or drawdown test. Base on data of CBM production in different blocks, the permeability of coal seam is amended by historical matching of numerical simulation. The amended permeability is in range of (0.47~3.95)×10^-3μm², which is about 6.76 times than that of well test. The positive relationship between CBM production and amended permeability of coal seam exists. The permeability of coal seam in the south of Qinshui basin is high, especially at the Panzhuang and Duanshi areas. 