A method for imaging transient electromagnetic field response of electrical source

A transient electromagnetic and electric field response technology, applied in electric/magnetic exploration, radio wave measurement systems, instruments, etc., can solve problems such as limited imaging accuracy, large complexity and calculation, and difficult high-dimensional inversion. Achieve the effect of small calculation amount and fast calculation speed

Active Publication Date: 2019-05-31
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

The imaging accuracy of the fast imaging method is limited, and the inversion algorithm based on least squares is limited by the complexity of transient electromagnetic field response calculation and the large amount of calculation, so it is difficult to develop high-dimensional inversion with higher accuracy

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  • A method for imaging transient electromagnetic field response of electrical source
  • A method for imaging transient electromagnetic field response of electrical source
  • A method for imaging transient electromagnetic field response of electrical source

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Embodiment Construction

[0074] The specific embodiment of the present invention is described below in conjunction with accompanying drawing:

[0075] Pseudo-wave field interpretation of transient electromagnetic field data is one of the exploration directions for new interpretation techniques of transient electromagnetic field. The propagation of transient electromagnetic fields in the underground medium satisfies Maxwell's equations. Limited by the frequency range of the transient electromagnetic signal, it propagates in a diffusion manner, and the propagation process can be characterized by the Helmholtz equation. Bragg (1968) and Filippi (1969) mathematically derived the mathematical integral relationship between the mathematical quantities satisfying the diffusion equation and the mathematical quantities satisfying the wave equation, starting from the diffusion equation and the wave equation. The transformation of the electromagnetic field E satisfying the diffusion field and the virtual wavelet...

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Abstract

The invention discloses an electrical source transient electromagnetic electric field response imaging method, and belongs to the technical field of transient electromagnetic geophysical exploration method. The aim is to solve the bottleneck problem encountered in the explanation of the precision aspect when transient electromagnetic response is further increased using the traditional instant variable electromagnetic fast imaging method and based on the minimum least squares retrieval method. The electrical source transient electromagnetic electric field response imaging method comprises the steps that 1, the virtual wavelet analytical solutions of the electrical source instant variable electromagnetic field response are derived; 2, a virtual wavelet numerical solution method is obtained; 3, a velocity analysis imaging method of the electrical source transient electromagnetic field response is obtained. The imaging method is based on the mathematical integral transformation between the diffusion field and the wave field, the calculation amount is small and the calculation speed is fast; the method provides a foundation for the elaborated interpretation of the wave field of transient electromagnetic response.

Description

technical field [0001] The invention specifically relates to a transient electromagnetic electric field response imaging method of an electrical source, and belongs to the technical field of transient electromagnetic geophysical exploration methods. Background technique [0002] Transient electromagnetic method (TEM) is widely used in coalfield flooding, mineral resources and underground resource detection, and is an important geophysical prospecting method. The electrical source transient electromagnetic method is a branch of the transient electromagnetic method, which uses an electrical source to inject electromagnetic field signals into the ground, and collects induction signals from underground geological bodies during the source shutdown period to obtain its distribution information. [0003] The processing and interpretation of transient electromagnetic field signals is one of the key technologies of transient electromagnetic method. It is a typical geophysical invers...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 李海周楠楠薛国强
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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