视纵向电导成像方法在矿井地质灾害调查中的应用  

Application of Apparent Longitudinal Conductance Imaging in Mine Geological Hazard Investigation

作　　者：王文忠 刘继东 

机构地区：[1]甘肃煤炭地质勘查院,甘肃兰州730000 [2]甘肃煤田地质局,甘肃兰州730000

出　　处：《中国煤炭地质》2008年第2期57-60,69,共5页Coal Geology of China

摘　　要：在对甘肃省2005年度科研项目"电磁成像系统在煤矿地质探测中的应用研究"的研究过程中,提出一种提高电法勘探分辨率及解释精度的方法—视纵向电导成像方法。该方法在计算纵向电导微分的基础上,进行视纵向电导微分成像。为验证其微分成像的应用效果,设计了低阻薄层(H2=3m)与低阻厚层(H2=30m)2个3层地电模型(参数为:1ρ=3ρ=100Ω·m,2ρ=10Ω·m,H1=100m)。通过计算分析,可以看出:无论是低阻薄层还是低阻厚层,与其地电模型界面对应位置,视纵向电导曲线存在明显转折点,视纵向电导微分成像图则可看出明显电性差异,而常规视电阻率曲线却难以解释低阻薄层。利用该方法与常规解释结合,对陕西某矿区进行采空区探测,共圈出东、西两块采空区,后经钻探验证,采空区边界范围和展布形态基本和解释结果相吻合,但比较两种解释方法,常规解释的范围较视纵向电导微分成像解释的范围要大,可见新方法的解释结果更加可靠。During the research process of Gansu Province 2005 annual research project ＂Applicable research of electromagnetic imaging system in coal geological exploration＂, put forward a set of method to raise electric prospecting resolution and accuracy of interpretation-apparent longitudinal conductance imaging method. Based on longitudinal conductance differential calculus, the method has carry out apparent longitudinal conductance differential imaging. To verify the application effect, designed low-resistivity thin layer （H2=3m） and low-resistivity thick layer （H2=30m） two 3 layered geoelectric models （with parameters： ρ1=ρ3= 100Ω·m, ρ2=10Ωm, H1=100m）. Through calculation and analysis can find out： no matter what is low-resistivity thin layer or low-resistivity thick layer on the corresponding position of geoelectric model interface, the apparent longitudinal curves have existed obvious turning points, apparent longitudinal conductance differential images have obvious electrical differences, while conventional apparent resistivity curves are difficult to interpret low-resistivity thin layers. Combined the method and conventional interpretation, detected gobs in a Shaanxi mining area and circled out east and west two gob areas, drilling has verified their boundaries and extending configurations are basically coincided with interpreted results. Comparing two interpretation methods, the extent of conventional interpretation is larger than apparent longitudinal conductance differential imaging, and the later is more reliable.

关 键 词：电法勘探 视纵向电导成像 视电阻率法 纵向电导微分 地电模型 采空区 

分 类 号：P631.3[天文地球—地质矿产勘探]