School of Mining Engineering,Taiyuan University of Technology

针对煤层气开采前期注入CO2会使波及部位地层压力增大,从而阻碍氡气垂直向上运移的问题,研究了煤层注气(CO2)对相应区域地表氡气浓度造成的影响与活性炭测氡法在监测CO2分布特征方面的可行性。在对试验区氡气浓度的变化进行逐年监测后,运用变异函数分维值分析的方法来处理所采集的原始数据。研究结果表明:煤层注气(CO2)使得CO2波及区域相应地表的氡气分布趋于均衡,且氡气在不同方向的浓度变化有明显差异。活性炭测氡法可以有效监测驱替甲烷的CO2在煤层中的分布特征。

According to the carbon dioxide injected at early stage of coal bed methane exploration could cause strata pressure increased at spread parts,thus the rado n air vertical upward migration was blocked and a feasibility study was conducted on carbon dioxide injection in the seam affected to ground surface radon density in the re lated region and active carbon radon detection method applied to monitor and measure the carbon dioxide distribution features. After annual monitoring and measuring wer e conducted on the radon density variation in the test block,the fractal dimension analysis method of variance function was applied to process the original data collected. T he study results showed that carbon dioxide injection in the seam could make the radon distribution in relevant ground surface of carbon dioxide related region to be in bal ance and the radon density variation in different directions would be different obviously. The active carbon radon detection method could effectively monitor and measure th e carbon dioxide distribution features in the seam to replace methane.

国家高技术研究发展计划(863计划)资助项目(2011AA050102)；