矿井瞬变电磁法全空间视电阻率解释方法研究  

Research on full-space apparent resistivity interpretation technique in mine transient electromagnetic method

作　　者：杨海燕[1] 邓居智[1] 张华[1] 岳建华[2] 

机构地区：[1]东华理工大学核工程技术学院,江西抚州344000 [2]中国矿业大学资源与地球科学学院,江苏徐州221116

出　　处：《地球物理学报》2010年第3期651-656,共6页Chinese Journal of Geophysics

基　　金：国家重大科技专项(SinoProbe-03-04);国家自然科学基金项目(50774085)联合资助

摘　　要：从全空间中心回线源响应公式出发,推导了全空间晚期和全区视电阻率公式;通过与半空间公式比较和对实测资料的分析,研究了全空间视电阻率公式的应用效果.结果显示,全空间视电阻率为半空间视电阻率的(5/2)^(2/3)倍,其晚期视电阻率与真值的相对误差小于0.56%,而相应的半空间视电阻率与真值误差均大于42%.与常规解释方法相比,采用全空间全区视电阻率换算方法能更好地圈定低阻异常范围,且电阻率差异大.因此,该公式更适用于矿井瞬变电磁法资料处理与解释,并具有更好的效果.In this paper, full-space late-time and all-time apparent resistivity formula was derived based on homogeneous full-space response equation of central loop. By comparing with half-space formula and analyzing measured data, the application efficiency of this formula was studied. The results indicate that full-space apparent resistivity value is （5/2）^2/3 times that of half-space; and the relative error between its late-time value and true resistivity is less than 0.56%, while the error of half-space resistivity is greater than 42%. Compared with normal interpretation technique, this method can locate anomaly range, and acquire large resistivity contrast. Therefore, the inter-pretation technique has better applicability and effect for mine transient electromagnetic data.

关 键 词：瞬变电磁法 全区视电阻率 瞬变响应 重叠回线 全空间 

分 类 号：P631[天文地球—地质矿产勘探]