焦作煤田恩村井田煤层气赋存特征与开发利用前景

CBM Hosting Features and Exploitation,Utilization Prospect in Encun Minefield,Jiaozuo Coalfield

根据煤田地质勘查和煤层气参数井资料,对焦作煤田恩村井田煤层气赋存的地质条件和煤层气储层特征进行了分析,认为井田内煤层气含量与煤层厚度、煤层埋深、煤层割理发育程度、围岩气密性呈正相关,且明显受构造控制。以F5断层为界将井田分为北块段和南墙向斜主体块段两个富集区。初步预测井田内二1煤层气总资源量160亿m3,有较大开发潜力,由于该区煤层渗透率、储层温度较低,煤破裂压力与闭合压力差值小,不利于通过压裂产生有效延伸长度和导流能力的裂缝,建议设计施工水平井或多分支水平井,以增加煤层气产能。

Based on coal geological exploration and CBM parameter well data, analyzed CBM hosting geological condition and reservoir features in the Encun minefield, Jiaozuo coalfield, considered that the CBM content in the minefield has positive correlation with coal seam thickness, buried depth, cleat development degree, wall rock air-tightness, and controlled by structures obviously. To take the F5 fault as the boundary divided the minefield into north block and Nanqiang syncline main block two CBM abundant areas. Primarily predicted total CBM resource in the No.II1 coal seam in the minefield is 16 billion m3 with rather large exploitation potential. Due to lower coal seam permeability and reservoir temperature, small coal fracturing and closing difference, thus go against to produce effective extending length and conductive fractures through hydraulic fracturing. Horizontal or multilateral wells design and construction are suggested to increase CBM off-take potential.