To demonstrate the economy of developing surface CBM in Lishu Coal Mine,according to the standards of coalbed mechane resources and reserves,units of reserves calculation were demarcated,and the coalbed methane reserves of No.14 coal seam in Lishu Coal Mine was also calculated by the volume method,which showed the control reserves of the whole region was 3.58× 108 m3,the proven geological reserves was 0.91 × 108 m3,which belonged to medium depth,small reservoir.On the basis,the coalbed methane development project was designed,relevant economic evaluation was also carried out.The results showed that all economic indicators of CBM development were good,the financial internal rate of return after tax was 12.23％,higher than the benchmark rate of return (8％),the financial net present value after tax was 60.480 3 million,the investment recovery period after tax was 6.60 years (less than 8 years).The development of coalbed methane was feasible.After drainage 15 years,single well cumulative production reached 422.64× 104 m3,the recovery rate reached 48.94％,correspondingly,gas content (average) was reduced to less than 8 m3/t,gas pressure was reduced to about 0.74 MPa,which has achieved the purpose of eliminating regional gas outburst.%为了论证梨树煤矿地面煤层气开发的经济性,按照煤层气资源/储量规范,划定了储量计算单元,采用体积法计算了14号煤层的地质储量,显示全区控制地质储量3.58× 108 m3,探明地质储量为0.91× 108 m3,为埋深中等的小型煤层气藏.在此基础上,设计了煤层气开发方案,并进行了经济评估.结果表明:煤层气开发各项经济评价指标良好,项目税后财务内部收益率为12.23％,大于财务内部基准收益率8％,税后财务净现值为6 048.03万元,税后投资回收期为6.60年,小于基准投资回收期8年,地面煤层气开发可行;煤层气井排采15 a,单井累计产量达422.64× 104m3,采收率达48.94％,相应平均含气量降低为不到8 m3/t,瓦斯压力降至0.74 MPa左右,可达到区域消突的目的.
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