焦作矿区煤层气赋存特征及开发利用前景

CBM hosting features and exploitation,utilization prospect in Jiaozuo mining area

煤层气富集与地质条件和储层特征密切相关。利用煤田勘查和矿井生产资料,分析了焦作矿区二1煤煤层气赋存地质条件、赋存特征和储层特征;研究表明,区内煤层气含量与煤层埋深、围岩气密性呈正相关,与水文地质条件呈负相关,并受构造条件制约;预测矿区中部断块和南部断块二1煤煤层气资源丰富,有较好的开发利用前景。由于煤层渗透率较低,煤体结构变化较大,部分地段不利于通过压裂产生有效延伸长度和导流能力的裂隙,需要进一步探索成井工艺和储层改造措施,以提高煤层气产能。

The enrichment of coal bed methane is closely related to the geological conditions and reservoir characteristics. Based on the exploration of coal field and the production data of the mine,the geological conditions,the occurrence features and the characteristics of the reservoir of coal bed methane of Ⅱ1coal in Jiaozuo mining area were analyzed. Study shows that the area of coal bed methane content and depth of coal seam,surrounding rock properties were positively correlated,negatively correlated with hydrogeological conditions and controlled by tectonic conditions. Predicting that mining area in southern and central fault block Ⅱ1coal rich CBM resources has great development potential,due to the low permeability of coal seam,the structure of coal varies greatly,some area is not conducive to produce the fracture which has effective extense length and enough diversion capacity,so it is needed to further explore the mine shaft construction technology and reservoir improvement measures,to improve the productivity of coalbed methane.