EH4时频数据联合处理及其在煤矿采空区的应用

Joint analysis of EH4 data in time-frequency domain and application in gob areas of coal mine

煤矿采空区对地面建设工程和人民生命财产构成巨大潜在危害,利用EH4连续电导率剖面仪能对其进行有效识别.目前,EH4数据处理基本依赖于系统自带软件IMAGEM,所得结果一般很难满足资料解释的精度要求,故掌握EH4数据的再处理具有重要意义.对EH4数据进行时频联合处理能够最大化利用地电响应信息:时域数据处理是对原始资料的再认识过程,其基本流程包括时间序列读取、时频转换、功率谱分析和阻抗估算;频域数据处理则是在时域数据处理的基础上,选择合适的反演方案,将所得的高质量频域数据进行反演成图.本文通过对某煤田相关矿区进行大地电磁探测及EH4数据处理,对这些区域的大地电磁响应进行分析,得到高质量频域数据,并利用基于阻尼高斯-牛顿法的正则化反演进行频域数据反演成图及解释,最后得出了合理可靠的地球物理解释,成功圈闭出三处采空区,并在实际回填过程中得到验证,处理结果真实可信.

Gob areas of coal mine,which are great potential risks to the construction and human life and property,can be identified efficiently by EH4 exploration.EH4 data processing relies on the internal soft called IMAGEM at present,but generally the results can hardly satisfy accuracy demand.Therefore,it is significant to master the intensive treatment of EH4 data,and joint analysis in time and frequency domain helps us use the data to the most.Data processing in time domain,including reading time-series files、time-frequency transform、power spectrum analysis and impedance estimation,is recognition of EH4 original data.Processing of data in frequency domain is the next step after time-domain data procedure,and its main task is inversion.In order to get a more reasonable explanation in geo-physics,we solve the inverse problem by using the damped Gauss-Newton optimization algorithm,and then mapping.Through exploration via MT and processing EH4 data in some certain mining areas,we get three gob areas which are proved when during backfilling.It indicates that the results are reliable.