Xi'an Research lnstitute Company Limited,China Coal Technology and Engineering Group

为深入研究我国低阶煤的地面煤层气开发潜力,采用等温吸附试验,结合量子化学计算方法、煤层气藏数值模拟手段、工程应用实践结果,对我国低阶煤地面产气机理及潜力进行了深入的研究和探讨。结果表明:低阶煤虽然煤层气含量低,但由于气体解吸能力较强,在排水降压时仍可有很大比例气体解吸产出;同时由于煤层厚度大,煤层渗透性较好,地面抽采具有比较大的产气潜力;在铜川区块4口地面煤层气试验井稳产气量超过1 000 m~3/d,实现了国内低阶煤地区煤层气井的工业性气流,验证了我国低阶煤地面煤层气开发具有很大的潜力,今后应加快开发步伐、加强开发力度。

in order to deeply studly the coalbed methane suriace development potential of the low rank coal in China,the isthermal adsoption experiment combined with the quanturm chemistry caculation nethod,the numerical sinu ation means of the coalted methaneresevofr and engineeing applcaion and practiceresulis were applied to the deep study and discussion on the low rank coal suriace gas production mechanism and potentai in China Theresuls showed tht athough the cabd methane content from the low rank coal as ow and due to the gas desorption capacity was high a lage pecentage gas desorption outaut could be possihle during the water discharging and prssure releasing period.Meanwile due to the high sean thickness and good seam pemeatiltythe surace drainage would have a igh gas production potential. n Tongchuan Block there were four surace coalbed methane est ells with a stable gasproduction over 10.1 m~s3 per day.An industral as fow from the coalbed methane well n the low rank seam was ealized inChina and could veritfythe coabsed netane surace developmen inth lov rank ceal i t a agh potential. Thus the development step should be speeded up and the development force should be enhanced.

国家科技重大专项资助项目(2011ZX05040-003)；