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An electromagnetic detection method for deep resources based on the combination of mobile and fixed sources

An electromagnetic detection and fixed source technology, applied in the field of electromagnetic detection, can solve problems such as near-field effects that cannot be solved, achieve strong anti-interference ability, ensure work efficiency, and achieve the effect of large depth and high precision

Active Publication Date: 2020-09-22
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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Problems solved by technology

[0009] The invention proposes an electromagnetic detection method for deep resources combining mobile sources and fixed sources. The invention can solve the near-field effect problem that cannot be solved in the existing CSAMT technology

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  • An electromagnetic detection method for deep resources based on the combination of mobile and fixed sources
  • An electromagnetic detection method for deep resources based on the combination of mobile and fixed sources
  • An electromagnetic detection method for deep resources based on the combination of mobile and fixed sources

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Embodiment Construction

[0042] The specific technical solutions of the present invention are described in conjunction with the examples.

[0043] The present invention proposes to use the existing CSAMT technology to transmit high-frequency signals, and use the high-power fixed antenna of the WEM method to transmit low-frequency signals. The two simultaneously transmit and receive the electromagnetic detection method combining the fixed source and the mobile source. The field work method is as follows: figure 1 shown.

[0044] Working steps of the present invention are:

[0045] (1) Judging the lowest frequency f low

[0046] Collect geological data related to the survey area, and determine the position of the survey line and the position of the mobile emission source according to the existing CSAMT field work method. According to the designed maximum detection depth range, use the following formula to determine the minimum frequency required. In the formula, δ is the designed detection depth, ρ...

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Abstract

The present invention provides an electromagnetic detection method for deep resources combining mobile sources and fixed sources, including (1) judging the lowest frequency f low ; (2) Forward modeling calculation of the electromagnetic sounding curve within the detection frequency range; (3) Judging the frequency point f at which the near-field effect begins to occur nf (4) design the emission frequency tables of mobile emission sources and high-power fixed sources; (5) collect and obtain the full-band electromagnetic detection time series; (6) obtain the apparent resistivity and impedance phase corresponding to each frequency point; (7) convert The apparent resistivity value and impedance phase value of all frequency points are combined to obtain the electromagnetic sounding curve without near-field effect in the whole frequency band. The present invention collects the high-frequency signal of the mobile transmitting source, receives the low-frequency signal transmitted by the high-power fixed source, and processes the two signals in a unified manner, effectively solving the near-field effect encountered in the CSAMT method, and obtaining the near-field-free Controlled source electromagnetic method data reflecting the real electrical characteristics of the underground in the full frequency band.

Description

technical field [0001] The invention relates to the technical field of electromagnetic detection, in particular to an electromagnetic detection method for deep resources combining a mobile source and a fixed source. Background technique [0002] Among geophysical prospecting methods, frequency-domain electromagnetic prospecting methods are widely used in the detection of the earth's internal structure and underground resources such as oil and gas, minerals, and geothermal. [0003] The magnetotelluric (MT) method using natural source signals has weak anti-interference ability and low measurement accuracy. In order to overcome the shortcomings of MT method, a controlled source audio frequency magnetotelluric sounding method (CSAMT) using artificial sources is proposed. The remarkable feature of the CSAMT method is that the received signal has a higher signal-to-noise ratio, which can improve the accuracy and work efficiency of field measurements compared with the magnetotellu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/08
CPCG01V3/08
Inventor 付长民底青云
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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