准噶尔盆地彩南地区深层低阶煤吸附特征及其影响因素.pdfVIP

第44 卷 第2 期 煤田地质与勘探 Vol. 44 No.2 2016 年4 月 COAL GEOLOGY EXPLORATION Apr. 2016 文章编号: 1001-1986(2016)02-0050-05 准噶尔盆地彩南地区深层低阶煤吸附 特征及其影响因素 陈 刚 ( 中国石油化工股份有限公司石油勘探开发研究院，北京 100083) : 现有数据表明我国 1 000 m 以浅低阶煤层含气量普遍偏低，而深层低阶煤试采效果显示较 好。基于 Langmuir 方程开展了低阶煤高温高压环境下等温吸附模拟实验，结果表明：褐煤吸附量 约占长焰煤、气煤吸附量的 1/3，吸附能力最弱，随着煤阶的升高，吸附量逐渐增大；实验发现低 阶煤在 55℃、12 MPa 以下吸附量随温度、压力增大而增加较快，并建立了基于煤阶-温度-压力条 件下的深层低阶煤饱和吸附模型；煤层随着埋藏深度的增加，吸附量呈现出快速增加-缓慢增加- 缓慢递减的过程，即深层煤层吸附量存在吸附临界深度带，为 1 400~1 700 m。1 400 m 以浅吸附 量受压力正效应大于温度负效应，吸附量随埋深增加而增加，临界深度带内吸附量达到极限，不 再增加，1 700 m 以深温度负效应大于压力正效应，吸附量随深度增加而减小。实验结果为深层低 阶煤层气资源评价及开发潜力提供理论依据。 ：准噶尔盆地；深层；低阶煤；含气量；吸附量；影响因素 ：P618.13 ：A DOI: 10.3969/j.issn.1001-1986.2016.02.010 The adsorption characteristics and affecting factors of deep low-rank coal in Cainan area of Junggar basin CHEN Gang (Petroleum Exploration and Production Research Institute, SINOPEC, Beijing 100083, China) Abstract: The available data show that the gas content of low-rank coal is generally low at the depth less than 1 000 m, however, the pilot production of gas of deeper low-rank coal has better effect. Based on the Langmuir equation, we carried out the low-rank coal isothermal adsorption simulation experiments under high temperature and high pressure. The experiment results show that the adsorption capacity of brown coal was the weakest, about a third of long-flame coal and gas coal, and adsorption quantity increased gradually with coal rank; the experiments results also show tha