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High-precision data interpretation method for shallow low-resistance abnormal body of ground-air time domain electromagnetic system

A time-domain electromagnetic, precision data technology, applied in the field of geophysical exploration, can solve the problem of not mentioning the influence of the air receiving device and so on

Active Publication Date: 2020-04-10
JILIN UNIV
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Problems solved by technology

Since the main focus of the frequency domain electromagnetic method is on the detection of deep anomalies, it does not mention the influence of the height of the air receiving device from the ground on the resolution of the magnetic field measurement

Method used

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  • High-precision data interpretation method for shallow low-resistance abnormal body of ground-air time domain electromagnetic system
  • High-precision data interpretation method for shallow low-resistance abnormal body of ground-air time domain electromagnetic system
  • High-precision data interpretation method for shallow low-resistance abnormal body of ground-air time domain electromagnetic system

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Embodiment

[0069] refer to figure 2 combine figure 1 , the present invention provides a method for interpreting high-precision data of shallow low-resistance anomalies in an earth-space time-domain electromagnetic system.

[0070] 1) Numerical simulation of the electromagnetic response of a shallow quasi-two-dimensional low-resistance anomalous body based on a long wire source time-domain electromagnetic system;

[0071] Numerical simulation of the electromagnetic response of shallow quasi-two-dimensional low-resistance anomalies using the electromagnetic response expression of the layered medium model: Reference image 3 (σ′ 2 is the conductivity of the low-resistance anomalous body), the number of earth layers, the conductivity and thickness of each layer during data simulation are determined through the earth model below the measuring point, and the z-direction magnetic field frequency domain response expression of the N-layer earth model of the grounded long wire source for:

[...

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Abstract

The invention belongs to the technical field of geophysical exploration, and particularly relates to a high-precision data interpretation method for a shallow low-resistance abnormal body of a ground-air time domain electromagnetic system. The method comprises the following steps: simulating a shallow quasi-two-dimensional low-resistance abnormal body electromagnetic response numerical value basedon a long conductor source time domain electromagnetic system; performing random noise loading based on different signal-to-noise ratios on the analog value; adopting a regularization method to realize the downward continuation of the long wire source time domain electromagnetic response of the noisy signal; determining the optimal precision of the regularization continuation method under different signal-to-noise ratio conditions by adjusting regularization parameters; carrying out denoising processing on the electromagnetic response which does not meet the tolerance condition in the previous step by adopting an adaptive Kalman filtering algorithm; calculating the apparent resistivity and the apparent depth, and completing the apparent resistivity-apparent depth imaging. By means of themethod, high-precision data interpretation and imaging of noise-containing signal time domain electromagnetic response of the shallow anomalous body are achieved.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, in particular to a method for interpreting high-precision data of shallow low-resistance anomalies in a time-domain electromagnetic system, and is especially suitable for the detection method of an earth-space time-domain electromagnetic system. Background technique [0002] The ground-space time-domain electromagnetic system with long wire source lays long wires on the ground as the emission source, and the portable receiving equipment is mounted on platforms such as rotor drones and airships as air receiving devices, which can realize complex areas such as tidal flats, mountainous areas, and sea-way interaction belts. Efficient and fast geological survey tasks. Compared with the aerial time-domain electromagnetic detection system, it has the advantages of large exploration depth, low flight cost and high safety. In recent years, it has gradually become a research hotspot of time...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
CPCG01V3/087
Inventor 关珊珊刘俐君刘汉卿吴琼嵇艳鞠
Owner JILIN UNIV
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