淮南矿区谢一矿关闭前后B_(11b)煤层瓦斯地质特征变化分析  

Analysis on the Change of Gas Geological Characteristics of B_(11b)Coal Seam before and after the Closure of Xieyi Coal Mine in Huainan Mining Area

作　　者：胡春磊 刘会虎[1] 丁海[2] 徐宏杰[1] 杨靖浩 尚建华 HU Chunlei;LIU Huihu;DING Hai;XU Hongjie;YANG Jinghao;SHANG Jianhua(School of Earth and Environment,Anhui University of Science and Technology,Huainan,Anhui 232001;Research Institute of Anhui Provincial Coalfield Geology Bureau,Hefei,Anhui 230088)

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安徽省煤田地质局勘查研究院,安徽合肥230088

出　　处：《中国煤炭地质》2023年第11期18-22,共5页Coal Geology of China

基　　金：国家自然科学基金项目(42277483);安徽省自然科学基金项目(2008085MD121,2108085MD134);安徽理工大学2022研究生创新基金项目(2022CX2004);安徽省自然资源厅公益性地质项目(2021-g-2-14)。

摘　　要：为调查淮南矿区矿井关闭前后瓦斯地质特征变化,以谢一矿B_(11b)煤层为研究对象,基于矿井瓦斯历史工作和收集的矿井关闭后煤层气参数井资料,分析了该煤层的含气性特征。研究表明:B_(11b)煤层关闭前甲烷含量(CH4,daf)2.01~15.29m^(3)/t;关闭后甲烷含量(CH4,daf)0.92~11.65m^(3)/t。关闭前甲烷浓度6.72%~90.51%;关闭后甲烷浓度43.31%~80.58%。关闭前预测的瓦斯赋存规律在垂向上和平面上主要受埋深和地质构造影响。关闭后新谢-3井B_(11b)煤层甲烷含量在垂向上较关闭前的预测结果有所下降,原因可能与采动应力场和储层流体场的变化、矿井关闭后瓦斯的重新运移与聚集、煤层采动后瓦斯含量临界深度的变化及其导致的瓦斯赋存状态的改变有关。To investigate the changes of gas geological characteristics before and after mine closure in Huainan mining area,taking B_(11b)coal seam of Xieyi Mine as the research object,based on the historical work of mine gas and the collected data of coalbed methane parameter wells after mine closure,the gas-bearing characteristics of the coal seam were analyzed.The results show that the methane content(CH4,daf)of gas before the closure of B_(11b)coal seam varies from 2.01 to 15.29 m^(3)/t.The methane content(CH4,daf)varied from 0.92 to 11.65 m^(3)/t after the closure.The methane concentration changed from 6.72%to 90.51%before closing.The methane concentration changed by 43.31%~80.58%after closing.The predicted gas occurrence law before closing is mainly affected by buried depth and geological structure in vertical and horizontal plane.After the closure of B_(11b)coal seam in Xinxie-3 well,the gas content of methane in the vertical direction is lower than that before the closure.The reason may be related to the change of mining stress field and reservoir fluid field,the relocation and accumulation of gas after the closure of the mine,the change of the critical depth of gas content after coal seam mining and the change of gas occurrence state.

关 键 词：关闭矿井 矿井瓦斯 B_(11b)煤层 淮南矿区 

分 类 号：P618.11[天文地球—矿床学]