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Three-dimensional time domain aviation electromagnetic rapid inversion method

An aero-electromagnetic and time-domain technology, which is used in electrical/magnetic exploration, radio wave measurement systems, and sound wave re-radiation. , to reduce the amount of inversion data, improve the inversion efficiency, and ensure the resolution ability.

Inactive Publication Date: 2020-07-31
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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  • Three-dimensional time domain aviation electromagnetic rapid inversion method

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Embodiment Construction

[0030] The technical idea of ​​the present invention is to first extract a small amount of characteristic data on a large scale, use a rough inversion grid to quickly invert the large-scale macroscopic electrical structure of the underground, and use the current scale inversion result as the initial model of the next scale. Then, the data sampling scale is reduced, and the sampling detail feature data is supplemented on a small scale. At the same time, according to the multi-scale analysis of the model sensitivity, the electrical anomaly area is locally refined, the inversion grid is updated, and the subsurface small-scale detailed structure is inverted. Finally, by gradually reducing the inversion scale, the rapid and refined inversion of airborne electromagnetic data in the time domain is realized.

[0031] Such as figure 1 As shown, this embodiment provides a three-dimensional time-domain airborne electromagnetic fast inversion method, and the specific steps are:

[0032] ...

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Abstract

The invention discloses a three-dimensional time domain aviation electromagnetic rapid inversion method. The method comprises the steps: firstly constructing an optimal second-generation wavelet suitable for time domain aviation electromagnetic data, and carrying out the multi-scale decomposition of time domain aviation electromagnetic observation data; adaptively selecting an optimal wavelet threshold, and extracting feature data of the current scale; performing model sensitivity multi-scale wavelet analysis, and optimizing a time domain aviation electromagnetic inversion grid in a self-adaptive mode; performing time domain aviation electromagnetic three-dimensional Gaussian-Newton inversion by utilizing the feature data extracted on the current scale and the inversion grid; and extracting time domain aviation electromagnetic characteristic data on different scales step by step to participate in inversion by gradually reducing data space and model space scales, and updating an inversion grid in a variable-scale manner, so that rapid and refined inversion of the time domain aviation electromagnetic data is realized. The time domain aviation electromagnetic three-dimensional inversion efficiency can be effectively improved while the resolution is ensured.

Description

technical field [0001] The invention relates to the field of applied geophysics, in particular to a three-dimensional time domain airborne electromagnetic fast inversion method. Background technique [0002] The time-domain airborne electromagnetic method uses an airborne mobile platform and a transient electromagnetic loop device to achieve non-destructive detection of underground targets. It has the advantages of fast working speed, high resolution, and no need for ground personnel to approach. It is very suitable for ground geophysical surveys where it is difficult to carry out It has been widely used in mineral resource exploration, groundwater and geothermal resource investigation, engineering environment and other fields for rapid electromagnetic exploration in high mountains, deserts, swamps and other areas. [0003] At present, there are two main types of time-domain airborne electromagnetic data interpretation technologies: one-dimensional imaging and three-dimensio...

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Application Information

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Patent Type & Authority Applications(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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