Deep resource electromagnetic detection method combining mobile source and fixed source

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, achieve large depth and high precision, and ensure work efficiency.

Active Publication Date: 2020-06-16
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

Method used

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  • Deep resource electromagnetic detection method combining mobile source and fixed source
  • Deep resource electromagnetic detection method combining mobile source and fixed source
  • Deep resource electromagnetic detection method combining mobile source and fixed source

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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 invention provides a deep resource electromagnetic detection method combining a mobile source and a fixed source. The deep resource electromagnetic detection method comprises the following steps of: (1) judging a lowest frequency flow; (2) calculating an electromagnetic sounding curve in a detection frequency range through forward modeling; (3) judging a frequency point fnf at which a near-field effect starts to be generated; (4) designing a transmitting frequency table of a mobile transmitting source and a high-power fixed source; (5) acquiring to obtain a full-band electromagnetic detection time sequence; (6) acquiring apparent resistivity and impedance phase corresponding to each frequency point; (7) and performing data combination on the apparent resistivity values and the impedance phase values of all the frequency points to obtain a full-band electromagnetic sounding curve without a near-field effect. According to the deep resource electromagnetic detection method, the high-frequency signals of the mobile transmitting source are collected, the low-frequency signals emitted by the high-power fixed source are received, and the signals of the mobile transmitting source and the high-power fixed source are uniformly processed, so that the near-field effect in the CSAMT method is effectively solved, and the controllable source electromagnetic method data which does not contain near-field influence and reflects underground real electrical characteristics in a full-band manner is obtained.

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...

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Application Information

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Patent Type & Authority Applications(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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