摘要
基于山西神州煤业井田各煤层钻孔瓦斯含量测试资料,详细分析主采煤层的瓦斯赋存特征,阐释了断层、褶皱、煤层埋深、顶底板岩性、陷落柱等因素对瓦斯含量的影响规律。结果表明:(1)从平面上看,神州煤业4、8、10号煤层瓦斯含量在井田东、北、南部较高;从层位看,10号煤层瓦斯含量最高,8号煤层次之,4号煤层最低,瓦斯含量具有随埋深增加而加大的趋势。(2)4号煤层瓦斯成分以氮气为主,在井田东南部分布有氮气—甲烷带;8号煤层在井田西部煤层露头附近分布有氮气-二氧化碳带,接着为狭长的氮气带,在井田北部、东部、南部的绝大部分为氮气-甲烷带;10号煤层瓦斯成分以氮气(N_(2))为主,在井田西部煤层露头附近分布有氮气-二氧化碳带,井田中部的一小部分为氮气带,在井田北部、东南部分布有氮气-甲烷带,井田东部和南部分布有甲烷带。(3)煤层构造形态特征对瓦斯保存有重要影响。4号煤层瓦斯含量随埋深增大没有规律性,8、10号煤层瓦斯含量与煤层埋深呈显著的正相关关系。太原组L1灰岩中富集由8、10号煤层中运移而来的瓦斯气体,在煤矿开采过程中需加以注意。本文研究成果有望为矿区煤炭安全生产以及煤层气开发提供参考。
Based on the gas content test data of every coal seam in Shanxi Shenzhou coal mine field, the gas occurrence characteristics of main coal seam are analyzed in detail, the influence law of fault, fold, coal seam buried depth, roof and floor lithology, collapse column and other factors on gas content is explained.The results show that:(1) the gas content of No. 4, No. 8 and No. 10 coal seams of Shenzhou coal industry is higher in the east, north and south of Well-field system province. From the horizon, the gas content of No. 10 coal seam is the highest, No. 8 coal seam is the lower, No. 4 coal seam is the lowest. The gas content increases with the buried depth.(2) the gas composition of No. 4 coal seam is mainly composed of nitrogen, and there is a nitrogen-methane zone in southeastern Well-field system, while no. 8 coal seam has a nitrogen-carbon dioxide zone near the coal seam outcrop in western Well-field system, followed by a narrow nitrogen zone, the vast majority of northern, eastern and southern Well-field system is the nitrogen-methane belt. The gas composition of No. 10 coal seam is mainly nitrogen(N_(2)). There is a nitrogen-carbon dioxide zone near the outcrop of the coal seam in western Well-field system, and a small part of the central part of the mine field is nitrogen zone.There are nitrogen-methane zones in the north and south-east of Well-field system, and methane zones in the east and south of the minefields.(3) The coal seam structure shape characteristic has the important influence to the gas preservation.The gas content of No. 4 coal seam has no regularity with the increase of burial depth, and the gas content of No. 8 and No. 10 coal seam has a significant positive correlation with the burial depth of coal seam.The L1 limestone of Taiyuan Formation is rich in the gas migrated from No. 8 and No. 10 coal seams, which should be paid attention to in the process of coal mining. The research results in this paper are expected to provide reference for coal mine safety production and CBM development.
作者
周卫博
ZHOU Wei-bo(Shanxi Mining Federation,Shanxi,Taiyuan 030001,China)
出处
《地下水》
2022年第6期155-157,共3页
Ground water
基金
山西省基础研究计划项目(20210302123177)
山西省国土资源厅矿业权价款地质勘查项目(2013-24)。
关键词
神州煤业
煤岩
瓦斯含量
瓦斯成分
赋存规律
Shenzhou coal industry
Coal rock
Gas content
Gas composition
Occurrence law
