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A 3D time-domain airborne electromagnetic fast inversion method

An aero-electromagnetic and time-domain technology, which is used in electrical/magnetic exploration, radio wave measurement systems, instruments, etc., can solve the problems of high computational cost, low inversion efficiency, and large amount of three-dimensional calculation of time-domain airborne electromagnetics. The effect of ensuring the resolution ability, improving the inversion efficiency, and reducing the amount of inversion data

Inactive Publication Date: 2021-08-17
CHANGAN UNIV
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Problems solved by technology

However, the time-domain airborne electromagnetic method has intensive sampling and a large amount of data, resulting in a large amount of time-domain airborne electromagnetic 3D calculation and low inversion efficiency
Due to the high cost of calculation, the 3D inversion cannot be practical, which has become a technical problem that plagues the promotion of time-domain aeronautical electromagnetic technology
[0004] For the technical problem of how to effectively improve the efficiency of three-dimensional airborne electromagnetic inversion in the time domain, there is no mature technical solution yet

Method used

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  • A 3D time-domain airborne electromagnetic fast inversion method
  • A 3D time-domain airborne electromagnetic fast inversion method
  • A 3D time-domain airborne electromagnetic fast inversion method

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Embodiment Construction

[0030] The technical idea of ​​the present invention is, first extracting a small amount of feature data on a large scale, quickly inversion of a rough inversion grid to quickly inverse the underground large-scale macroscopic electrical structure, and the current scale inversion results are initial models of the next scale. Then, reduce the data sampling scale, supplement the sampling detail feature data on a small scale, and simultaneously refine the electrical abnormal area according to the model sensitivity multi-scale analysis, update the inversion grid, and inverse the underground small scale detail structure. Finally, the fast and refinement of time domain aviation electromagnetic data is achieved by gradually reducing the inversion scale.

[0031] like figure 1 As shown, the present embodiment gives a three-dimensional time domain air electromagnetic rapid inversion method, and the specific steps are:

[0032] Step (1): According to the air electromagnetic change law, const...

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Abstract

The invention discloses a three-dimensional time-domain aeronautical electromagnetic fast inversion method. The method first constructs the best second-generation wavelet suitable for time-domain aeronautical electromagnetic data, and performs multi-scale decomposition on the time-domain aeronautical electromagnetic observation data; self-adaptive selection Optimize the wavelet threshold, extract the characteristic data of the current scale; conduct multi-scale wavelet analysis of model sensitivity, and adaptively optimize the time-domain airborne electromagnetic inversion grid; Three-dimensional Gauss-Newton inversion; by gradually reducing the scale of data space and model space, time-domain airborne electromagnetic characteristic data on different scales are extracted step by step to participate in the inversion, and at the same time, the inversion grid is updated with variable scales to achieve fast time-domain airborne electromagnetic data Refined inversion. While ensuring the resolution, it can effectively improve the efficiency of time-domain airborne electromagnetic 3D inversion.

Description

Technical field [0001] The present invention relates to the application of geophysical fields, and more particularly to a three-dimensional time domain aeronautography rapid inversion method. Background technique [0002] The time domain aviation electromagnetic method uses the airborne mobile platform and the transient electromagnetic retirement device to achieve non-destructive detection on the underground target, which has the advantages of fast working speed, high resolution, no need to approach the ground personnel, and is ideal for difficult to carry out ground geophysical exploration. Rapid electromagnetic exploration in the high mountains, deserts, swamps, etc., has been widely used in mineral resources exploration, groundwater and geothermal resource survey, and engineering environment. [0003] At present, the time domain aviation electromagnetic data interpretation technology mainly has one dimensional imaging and three-dimensional inversion. Since the traditional one-...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 齐彦福戚志鹏李貅周建美孙乃泉
Owner CHANGAN UNIV
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