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Transient electromagnetic and induced polarization effect decoupling method

It is a technology of excited polarization and transient electromagnetic, which is applied in electric/magnetic exploration, radio wave measurement system, sound wave re-radiation, etc. It can solve problems such as the complexity of electromagnetic coupling, the scrapping of collected data, and the failure of interpretation methods. Simplify the calculation of separation matrix inversion, ensure stability, and improve the effect of effective application

Inactive Publication Date: 2018-12-11
CHANGAN UNIV
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Problems solved by technology

[0003] Theoretically, if there is no excitation polarization effect, the transient electromagnetic response is a strictly attenuated positive signal, but due to the existence of the coupling effect, the transient electromagnetic late signal often does not satisfy the attenuation law, and is accompanied by a large number of negative values, which makes the traditional The interpretation method is completely ineffective, resulting in the complete scrapping of the collected data
[0004] Therefore, exploring the decoupling of transient electromagnetic and induced polarization responses and realizing the joint interpretation of transient electromagnetic and induced polarization has become the focus of mineral resource exploration research. However, due to the complexity of electromagnetic coupling, there is no universal Adaptive method

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  • Transient electromagnetic and induced polarization effect decoupling method

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Embodiment Construction

[0027] refer to figure 1 , a method for decoupling transient electromagnetic and induced polarization effects includes the following steps:

[0028] Step 1, the collected signal is decomposed into a DC component and an AC component, and the extracted AC component reflects the coupling effect of transient electromagnetic and induced polarization effects, which is used as a signal source for independent component analysis;

[0029] The independent component analysis method requires that the source signal is a real random variable with zero mean value and is statistically independent of each other at any time. In order to meet this condition, the collected signal is firstly decomposed and expressed as the sum of the DC component and the AC component. The extracted AC component reflects the coupling effect of transient electromagnetic and induced polarization effects, and is used as the signal source for independent component analysis.

[0030] Step 2, using the mutual informatio...

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Abstract

The invention discloses a transient electromagnetic and induced polarization effect decoupling method. The method is characterized by dividing a receiving signal into a direct current component and analternating current component and taking the alternating current component as a mixing signal; using an independent component analysis algorithm to realize transient electromagnetic and induced polarization effect decoupling; extracting a simple transient electromagnetic signal and an induced polarization signal; and then, carrying out three-dimensional inversion and interpretation. By using themethod of the invention, low-resistance geological abnormal information in geological mining detection can be effectively extracted, and an induced polarization effect is suppressed, and the comprehensive interpretation effect of transient electromagnetic and induced polarization in ore body exploration can be effectively increased.

Description

technical field [0001] The invention belongs to the technical field of geophysical detection, and in particular relates to a method for decoupling transient electromagnetic and induced polarization effects. Background technique [0002] In geological and mineral exploration, most ore-forming rocks are affected by the induced polarization effect, and the resistivity is a complex number related to factors such as emission frequency and electrochemical properties of rock ore, which leads to the electromagnetic field signal obtained from field measurements containing electromagnetic induction This phenomenon is mainly manifested in the phenomenon that the late signal of transient electromagnetic acquisition has a negative value when the transient electromagnetic prospecting is carried out in areas with strong induced polarization effects such as metal mines or sulfide minerals. , that is, the influence of transient electromagnetic excitation polarization effect. [0003] Theore...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/02G01V3/38
CPCG01V3/02G01V3/38
Inventor 戚志鹏周建美李貅孙乃泉
Owner CHANGAN UNIV
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