焦作九里山井田煤层气赋存特征分析

Analysis on CBM Occurrence Characteristics of Jiulishan Coalfield in Jiaozuo

通过对焦作九里山井田煤层气田区域地质条件和煤层气储层特征的分析,认为区内二1煤层发育稳定,厚度大,煤变质程度高,煤层的吸附和生气能力强,含气量高,围岩气密性良好;水动力条件有利于煤层气的富集和排采,具备煤层气富集和高产的有利条件。由于煤层渗透率低,煤体结构有差异,不利于煤层气的开发,建议选择合适的完井模式和改进压裂工艺,以提高煤层的渗透率,增加煤层气产能。

Through the analysis on regional geological condition and CBM reservoir characteristic of Jiulishan Coalfield of Jiaozuo,it is believed that Ⅱ 1 coal seam is stable,thick and has high deterioration degree,the adsorption and methane generation capability is high, gas content is high,seal condition is good;hydrogeological condition is of great benefit to CBM storage and production. Due to the low permeability and coal structure difference,it is difficult to develop CBM, so we should choose proper mine shaft completion mode and optimize fracturing technics to improve coal permeability and increase CBM production.