宿南矿区祁东煤矿煤层含气量和组分特征及其影响因素分析  

Analysis of the factors acting on the gas content and gas composition in the coal beds of the Qidong coal mine in the Su'nan mining area

作　　者：汪宏志[1] WANG Hongzhi(No.3 Unit,Bureau of Coal Geology of Anhui Province,Suzhou,Anhui 234000,China)

机构地区：[1]安徽省煤田地质局第三勘探队,安徽宿州234000

出　　处：《安徽地质》2023年第1期6-10,共5页Geology of Anhui

摘　　要：为研究宿南矿区祁东煤矿煤层气地质和地球化学特征及影响因素,在样品采集和测试基础上对含气量及组分进行测定,并探讨了影响因素。结果表明:煤层气组分以CH_(4)为主,含量为62.14%~98.0%(平均含量为87.57%);次为CO_(2)和N_(2),含量分别为0.00~8.63%(平均含量为4.08%)和0.15%~30.17%(平均含量为9.21%)。甲烷浓度与含气量成正比,与N_(2)浓度成反比。含气量随埋深增加而增加,但甲烷浓度变化不明显。另外,甲烷浓度和含气量与煤层厚度、顶板厚度呈弱正相关关系。含气量与水分关系为弱负相关,与灰分和挥发分为弱正相关。In order to study the geological and geochemical characteristics and influencing factors of coal bed methane in the Qidong coal mine in the Su'nan mining area,the gas content and gas composition were determined based on sample collection and testing,with their influencing factors being discussed.The results show that the main composition of the gas is CH_(4),ranging from 62.14%to 98.0%(average 87.57%)in content,followed by CO_(2) and N_(2),ranging from 0.00%to 8.63%(average 4.08%)and 0.15%to 30.17%(average 9.21%),respectively.The methane concentration is directly proportional to gas content and inversely proportional to N_(2) concentration.The gas content increases with the burial depth while the methane concentration does not change obviously.In addition,the methane concentration and gas content have weak positive correlation with the thickness of the coal bed and that of the roof.A weak negative correlation has been observed between the gas content and the moisture content,and a weak positive correlation between the gas content and the ash and volatile contents.

关 键 词：煤层气 含气量 煤层气组分 祁东煤矿 宿南矿区 

分 类 号：P611[天文地球—矿床学]