电性源瞬变电磁全区视电阻率定义  

All-time apparent resistivity definition for electrical source transient electromagnetic method

作　　者：闫国翔 尹秉喜 杨勇 

机构地区：[1]宁夏回族自治区地质调查院,宁夏银川750021

出　　处：《物探与化探》2017年第5期933-938,共6页Geophysical and Geochemical Exploration

摘　　要：电性源瞬变电磁法是目前研究的热点,研究该方法的全区视电阻率定义同样很重要。文中给出了一种快速有效的全区视电阻率定义方法,利用该方法可以快速计算电性源瞬变电磁多分量的全区视电阻率。利用均匀半空间磁场强度响应曲线的平移伸缩特性实现视电阻率定义,该算法无需迭代就可以直接计算,速度快,精度高。最后,对比了水平磁场分量和垂直磁场分量定义的全区视电阻率对地层的分辨能力。结果表明,两种分量定义的全区视电阻率有相同的分辨能力,给电性源瞬变电磁法的多分量综合解释技术奠定了理论基础。Grounded-wire source transient electromagnetic method is a hot research topic nowadays, and it is also very important to study all-time apparent resistivity of this method. In this paper, the author puts forward a fast and efficient calculation method of alltime apparent resistivity for grounded-wire source transient electromagnetic survey. This method can he used to calculate all-time apparent resistivity of multi-component quickly. The defination for all-time apparent resistivity can be achieved by using the translation scalability features of magnetic field characteristic curve in homogenous half space. The theoretical calculation results show that the apparent resistivity definition method does not require iterative with quicker speed and higher precision. Finally, a comparison was made for the resolution of electrical layer of horizontal magnetic field and vertical magnetic field based all-time apparent resistivity. The results indicate that the all-time apparent resistivity of the definition of two components has the same resolution. The results obtained by the authors establish the foundation for the multi-component interpretation technology of grounded-wire source transient electromagnetic method.

关 键 词：电性源瞬变电磁法 全区视电阻率 多分量 磁场强度 

分 类 号：P631[天文地球—地质矿产勘探]