中祁连煤层气成藏特征研究—以木里煤田弧山矿区为例  

Research on the characteristics of coalbed methane accumulation in the central Qilianmountains: a case study of the Hushan mining area in Muli coalfield

作　　者：李吉庆 晁海德 蔡廷俊 谢菁 李青 王琪玮 LI Jiqing;CHAO Haide;CAI Tingjun;XIE Jing;LI Qing;WANG Qiwei(Qinghai Provincial Fourth Geological Survey Institute,Xining 810001,China;Qinghai Province Shale Gas Key Laboratory,Xining 810001,China)

机构地区：[1]青海省第四地质勘查院,西宁810001 [2]青海省页岩气资源重点实验室,西宁810001

出　　处：《地质装备》2025年第2期29-32,39,共5页Equipment for Geotechnical Engineering

摘　　要：木里煤田弧山矿区含多段全区可采煤层,厚度较大,具备煤层气成藏的基础条件。为了解区内煤层气成藏特征,结合地质调查、钻孔、样品分析及瓦斯测试等工作,研究本区煤层赋存特征、煤层气控矿因素及成藏模式。结果表明:弧山矿区煤层赋存特征好,顶板岩石封盖性能较佳,储层埋深有利,含气量最高可达8.16 m 3/t,有一定的煤层气资源前景;受向斜及两翼发育的断层影响,南翼煤层含气量明显较北翼高;地下水水力封闭和水力封堵效果较明显,煤层气富集的向斜轴部为下步研究的重点。The Hushan mining area of Muli coalfield contains multiple sections of fully minable coal seams with a large thickness,which have the basic conditions for coalbed methane accumulation.In order to understand the reservoir formation characteristics of coalbed methane in the area,combined with geological surveys,drilling,sample analysis and gas testing,this study aims to investigate the coal seam occurrence characteristics,coalbed methane controlling factors and reservoir formation modes in this area.The results show that the coal seam occurrence characteristics and the roof rock sealing performance are good in the Hushan mining area,the reservoir burial depth is favorable,and the gas content can reach up to 8.16 m 3/t,which indicates a certain prospect for coalbed methane resources;Due to the influence of synclines and faults developed on both wings,the gas content of the coal seam in the southern wing is significantly higher than that in the northern wing;The hydraulic sealing and sealing effects of groundwater are obvious,and the inclined axis of coalbed methane enrichment is the focus of next research.

关 键 词：煤层气 木里组 弧山矿区 地下水 宽缓向斜富集 

分 类 号：P631[天文地球—地质矿产勘探]