煤层气成藏条件分析方法——以韩城地区为例

Analysis Method of Coal Bed Methane Reservoiring Conditions——Case Study in Hancheng Area

从煤系的沉积、埋藏、煤的演化生气以及气藏的改造定型等方面分析了韩城地区煤层气藏的形成与演化过程,进而对煤层气藏特征及煤层气富集成藏条件进行了剖析。韩城地区整体上为一单斜式煤层气成藏模式,聚煤作用和后期沉积对煤层气藏的形成演化非常有利,煤层气富集成藏的生气、储气及保存条件优越,主要成藏目标煤层厚度大且分布稳定,3号煤层煤层气成藏条件及开发条件较11号煤层优越。

Base on the analysis of the sediment, embedding and metamorphose of coal, and the reconstruction of reservoirs, the formation and evolvement process of Coal bed Methane （CBM） reservoirs in Hancheng area are studied, and characteristics of reservoirs, and conditions of CBM enrichment and reservoiring are analyzed. CBM reservoirs in Haneheng area are monocline, which is beneficial to CBM formation and evolvement due to its accumulation of coal and sediment in latter stage. Conditions for CBM production, storage and preservation are preponderant. The target coal seams of main reservoirs are thick and steadily distributed. No. 3 coal seam is more advantageous than No. 11 in conditions of CBM reservoiring and development.