煤层气有关术语辨析  

Analysis on terminologies related to coalbed methane

作　　者：傅雪海[1] 康俊强 陈义林[1] 段超超 卢杰林 张宝鑫 FU Xuehai;KANG Junqiang;CHEN Yilin;DUAN Chaochao;LU Jielin;ZHANG Baoxin(Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China)

机构地区：[1]中国矿业大学煤层气资源与成藏过程教育部重点实验室,江苏徐州221116

出　　处：《中国矿业大学学报》2025年第1期26-33,共8页Journal of China University of Mining & Technology

基　　金：国家自然科学基金面上项目(42372183,42072190);国家自然科学基金青年科学基金项目(42202198);江苏省自然科学基金资助项目(BK20221149)。

摘　　要：在煤层气勘探开发报告、文章及新闻报道中时常出现诸如“煤岩气”“煤层气藏”“含气量临界深度与深部”“含气量高饱和-超饱和”“低、中、高煤阶煤层气”“可燃基煤层瓦斯含量”等不规范词汇.通过查阅相关标准和教材,对上述术语进行了辨析.认为煤层气是以甲烷为主的烃类气体,不存在“低、中、高煤阶煤层气”;“煤岩气”“煤层瓦斯”实际就是煤层气;煤层气为连续型非常规天然气,没有明显的圈闭,浮力、水动力不起主导作用,不存在真正意义上的气、水界面和遮挡条件,存在富集区或“甜点区”;吸附气含量存在转换深度,含气量不一定存在转换深度;煤储层的深部以地应力临界深度划分较为科学,一是煤储层力学状态发生了改变,二是煤储层压裂裂缝展布方向发生了变化;吸附气饱和度不能代表含气饱和度,浅部低阶煤储层水溶气、游离气占比分别随平衡水分含量、孔隙度增加呈指数形式增大;挥发分和灰分是煤中的原始组分在特定条件下的转化产物,不能称之为挥发分含量和灰分含量,只能称为挥发分产率和灰分产率.研究成果对规范煤层气术语和相态含气量分析均具有指导意义.In coalbed methane(CBM)exploration and development reports,papers,and news,unstandardized terminologies were utilized,such as“coal rock gas”,coalbed gas reservoirs,critical depth of gas content,highly saturated/supersaturated gas content,low/medium/highrank CBM,and gas content of combustible base.The authors consulted relevant standards and textbooks to analyze those terminologies.It is believed that CBM is a hydrocarbon gas mainly composed of methane,and there is no low/medium/high rank CBM.The“coal rock gas”and“gas of coal seam”are actually CBM.The CBM is a continuous unconventional natural gas without traps,and is less affected by buoyancy and hydrodynamic force.There is no real gaswater interface and blocking condition,and rich areas or“sweet areas”can be found.A conversion depth occurs for adsorbed gas content,but not for total gas content.It is more scientifically to determine“deep regions”based on the critical depth of geostress,due to the changes in mechanical state and fracturing fracture propagation direction.The adsorbed gas saturation cannot represent the total gas saturation,and the proportion of water-soluble gas and free gas in shallow low-rank coal reservoirs increases exponentially with the increasing equilibrium moisture content and porosity,respectively.As volatile matter and ash are the conversion products of the original components in coal under specific conditions,it is inappropriate to utilize volatile matter content and ash content,which should be replaced by volatile matter yield and ash yield.The results provide guidance for standardizing the CBM terminology and analyzing the phase gas content.

关 键 词：煤层气 煤岩气 煤层气藏 含气饱和度 转换深度 基准 

分 类 号：P618.11[天文地球—矿床学]