多辐射场源地空瞬变电磁一维反演方法研究

doi:10.11720/wtyht.2019.1279

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Abstract

The ground-airborne transient electromagnetic method combines the principle and observation mode of ground and air transient electromagnetic survey, places the emission source on the surface, and uses the aircraft to receive the response signal in the air. Therefore, the ground-airborne transient electromagnetic method has the advantages of large sounding depth of the ground device, high signal-to-noise ratio and high efficiency of aviation equipment acquisition. Previous studies have focused on a single source of radiation, ignoring the advantages of multi-radiation field sources in exploration depth and signal-to-noise ratio. Therefore, it is necessary to study the data interpretation method applicable to the ground device of the multi-radiation field source. After solving the problem of the ground-airborne transient electromagnetic forward modeling and on the basis of the principle of Occam inversion, the authors studied one-dimensional inversion of multi-source ground-airborne transient electromagnetic survey. First of all, the important problem is the construction of objective function, and the objective function is constituted by the misfit and model roughness by introducing the Lagrange multiplier. Secondly, the problem of the construction of the sensitivity matrix is solved. The model calculation results show 1D Inversion of Multi-source Ground-airborne Transient Electromagnetic Method is effective, which can provide a good foundation and fine interpretation for three-dimensional inversion and fine interpretation. Through the inversion calculation of the typical model, it can be seen from the comparative study of its theoretical model and inversion results that the Occam inversion method can be applied to the Multi-source Ground-airborne Transient Electromagnetic Method, and adds a new approach to the interpretation of the Multi-source Ground-airborne TEM.

Key words： multi-source ground-airborne transient electromagentic method Occam inversion method

Received: 18 July 2018 Published: 20 February 2019

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Corresponding Authors: Xiu LI

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	Han ZHAO
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Cite this article:

Han ZHAO,Xu JING,Xiu LI, et al. A study of 1D inversion of multi-source ground-airborne transient electromagnetic method[J]. Geophysical and Geochemical Exploration, 2019, 43(1): 132-142.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1279 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I1/132

The platform of single-radiation source subdivision

The diagram of layered earth surface electric dipole coordinate system

The platform of multi-radiation source subdivision

Field source location and measuring point

The diagram and inversion results comparison chart of A-type

The diagram and inversion results comparison chart of Q-type

The diagram and inversion results comparison chart of KH-type

The diagram and inversion results comparison chart of HK-type

The diagram and inversion results comparison chart of five-layer model

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