Development unit division and favorable area evaluation for joint mining coalbed methane

YANG Zhaobiao,LI Yangyang,QIN Yong,SUN Hansen,ZHANG Ping,ZHANG Zhengguang,WU Congcong,LI Cunlei,CHEN Changxiao

Table 1 Quantitative indexes for dividing CBM development units.

Development unit class Coal seam thickness/m CBM content/ (m3·t-1) Permeability after fracturing/10-3 μm2 Reservoir pressure/MPa Coal structure factor Production potential index (Single or commingled layers)/(10-15 m6?MPa/t) Class I ≥3 ≥12 ≥0.2 ≥5 1 ≥36 Class II 1-3 8-12 8-36 Class III ≤1 ≤8 <0.2 <5 0 ≤8