沁水盆地安泽地区煤层气富集主控地质因素

通过对沁水盆地安泽区块煤层气地质条件和储层条件的深入分析，探讨了该区煤层气的富集规律及主要影响因素。研究发现，煤的岩石学特征、构造、顶底板岩性是影响煤层气富集的主要因素。总体上，安泽区块煤储层含气量受煤阶影响，表现为:煤的变质程度越高，吸附能力整体增强，含气量增大。局部区域，煤层气含量受煤层埋深、断层、褶皱及煤层顶底板岩性等综合因素的影响。在构造平缓带，煤层气含量随埋深增大而增大；在构造活动带，正断层上升盘含气量明显低于下降盘含气量，断层对煤层气的逸散作用明显。此外，泥岩顶底板封盖较砂岩顶底板封盖能力强。 

Factors affecting coalbed methane enrichment in Anze area,southeastern Qinshui basin

Through deepened analysis of CBM geological conditions and reservoir conditions in Anze block, the CBM enrichment law and its major influencing factors were discussed. The results show that coal petrology and structure of coal seam, as well as lithological characteristics of roof and floor rocks of coal seam are three key factors influencing gas content. Generally, gas content was manly controlled by coal rank. The higher coal metamorphic degree resulted in higher adsorption capacity of coal, and thus the greater gas content. Locally, gas content is also influenced by buried depth of coal, faults, folds and lithology of seam roof and floor. In structurally gentle zone, CBM content increased with burial depth. In faulting zone, gas content in the upthrow side of normal fault was obviously lower than that in the downthrown side. CBM dispersed obviously through faults. Mudstone and shale roof and floor of coal seam show better sealing capacity than that of sandstone roof and floor.