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Direct time domain processing method for transient electromagnetic sounding data

A transient electromagnetic and processing method technology, applied in the field of geophysical exploration, can solve problems such as errors, achieve the effect of high detection accuracy and enhance international status

Active Publication Date: 2012-04-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0008] To sum up, the main theoretical problems in TEM prospecting are: in the process of adopting TEM sounding data, first deduce it in the frequency domain, and then transfer it to the time domain; In the process of domain, it will cause error

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  • Direct time domain processing method for transient electromagnetic sounding data
  • Direct time domain processing method for transient electromagnetic sounding data
  • Direct time domain processing method for transient electromagnetic sounding data

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[0073] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0074] One of the core ideas of the present invention is to provide a direct time-domain processing method for transient electromagnetic sounding data, which may specifically include: using time-varying point charges as basic microelements, analyzing the large fixed source loop and long ground wire Derivation is carried out to obtain the analytical solution of the large fixed source return line and the long grounding wire. Compared with the traditional method using transient electromagnetic sounding data, the method adopted by the present invention can reduce the error caused in the process of deriving from the frequency domain to transferring to the time domain in the traditional method.

[0075] refer to figure 1 , which shows ...

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Abstract

The invention provides a direct time domain processing method for transient electromagnetic sounding data. The direct time domain processing method comprises the following step of: deducing a large fixed-source loop and long grounding lead analytic expression by using time varying point charge as a basic microelement to obtain a large fixed source loop and long grounding lead analytic solution. The direct time domain processing method for the transient electromagnetic sounding data based on the time varying point charge is used for replacing the traditional processing method for the transientelectromagnetic sounding data based on dipoles, and therefore, errors generated in the process from frequency domain deduction to time domain switching in the traditional method can be reduced, the inherent characteristic of a time domain electromagnetic field is highlighted, and the surveying accuracy of a transient electromagnetic method is greatly improved.

Description

technical field [0001] The invention relates to the field of geophysical exploration, in particular to a direct time-domain processing method for transient electromagnetic sounding data. Background technique [0002] Transient Electromagnetic Method (TEM), referred to as TEM, is a time-domain artificial source electromagnetic detection method based on the principle of electromagnetic induction. This method has higher sensitivity to low-resistance anomalies, and it has a pulse waveform with rich spectral components, which can cover the frequency band required for detection with one excitation, greatly improving work efficiency. In particular, the loop source devices of TEM, such as large fixed source loops, center loops, overlapping loops, and separate coils, have strong adaptability to construction sites, and can be used not only in rocky mountainous areas, urban streets, and coal mining industries. For construction in squares, villages, etc., it can also correct the static...

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Application Information

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IPC IPC(8): G01V3/38
Inventor 薛囯强闫述周楠楠
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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