|Table of Contents|

Calculation of All-time Apparent Resistivity for Arbitrary Horizontal Electrical Source Transient Electromagnetic Method(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2020年第06期
Page:
749-758
Research Field:
电磁法勘探专辑
Publishing date:

Info

Title:
Calculation of All-time Apparent Resistivity for Arbitrary Horizontal Electrical Source Transient Electromagnetic Method
Author(s):
SHANG Tian-xin1;  ZHANG Ji-feng1*;  FENG Bing1;  LIU Chang-sheng2
1. School of Geological Engineering and Geomatics, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Hunan Provincial Engineering Research Center for Aircraft Maintenance, Changsha 410124, Hunan, China
Keywords:
electrical source transient electromagnetic method;  all-time apparent resistivity;  superposition principle;  translation feature;  magnetic field intensity;  time derivative;  electrical structure;  Shaanxi
PACS:
P631.3
DOI:
10.19814/j.jese.2020.08023
Abstract:
In traditional data interpretation of electrical source transient electromagnetic method, the inverse function iteration method is used to obtain all-time apparent resistivity for long straight wire source, which is low efficiency and poor compatibility. Considering the shape of horizontal grounded-wire source may change in field survey, a definition method of all-time apparent resistivity was presented, which can adapt to complex electrical source emission. Firstly, the expression of arbitrary horizontal electrical source transient electromagnetic field was obtained by using the principle of electric dipole superposition. Then, the translation features of magnetic field intensity and its time derivative in uniform half space were revealed, and a calculative method of all-time apparent resistivity based on the above two ways was given by theoretical formula derivation. The method does not require iteration with quicker speed and higher precision. Finally, several different geoelectric models were designed to verify the feasible and effective of the method for calculating all-time apparent resistivity. The results show that all-time apparent resistivity can reflect geoelectric section well and distinguish conductive target better, and the resolution of low resistivity abnormal body is obviously better than that of high resistivity abnormal body. Compared with magnetic field intensity, all-time apparent resistivity defined by its time derivative has a larger anomalous amplitude, which is closer to true resistivity of layers. In addition, all-time apparent resistivity is only related to geoelectrical structure and has nothing to do with the offset. In processing field data for a place in Huayang town, Huazhou district, Weinan city, Shaanxi province, the induced voltage is transformed to the time derivative of magnetic field intensity, then the translation algorithm is used to calculate all-time apparent resistivity with a good complication result.

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Last Update: 2020-12-20