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Near source region frequency domain electromagnetic detection method and device, electronic equipment and storage medium

An electromagnetic detection and frequency domain technology, applied in the field of geophysical exploration, can solve problems such as unavailability, difficulty in extracting terrestrial electrical information, near-region electromagnetic field does not have plane wave properties, etc., to shorten the sending and receiving distance and improve the effect of formation resolution

Pending Publication Date: 2022-05-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the electromagnetic field in the near area does not have plane wave properties, traditional methods cannot use
In fact, when the observation distance is greater than 1 times the skin depth, the electromagnetic field has the ability to detect the earth, but when it is closer to the emission source, the anomalous field induced by the earth is covered by the strong primary field generated by the emission source , it is not easy to extract the geoelectricity information from

Method used

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  • Near source region frequency domain electromagnetic detection method and device, electronic equipment and storage medium
  • Near source region frequency domain electromagnetic detection method and device, electronic equipment and storage medium
  • Near source region frequency domain electromagnetic detection method and device, electronic equipment and storage medium

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Embodiment 1

[0044] Such as figure 1 As shown, the present invention provides a method for electromagnetic detection in the frequency domain of the near-source region, comprising:

[0045] Step S1, arranging the emission source of the observation point;

[0046] Step S2, obtaining the total vertical magnetic field strength of the observation point;

[0047] Step S3, according to the length of the emission source, the emission current and the coordinates of the observation point, obtain the primary vertical magnetic field intensity generated by the emission source at the observation point;

[0048] Step S4, using the total vertical magnetic field strength to subtract a vertical magnetic field strength to obtain the purely induced vertical magnetic field strength at the observation point;

[0049] Step S5, using the inversion technique to extract formation resistivity and depth information from the purely induced vertical magnetic field strength.

[0050] As an implementation manner of th...

Embodiment 2

[0068] The present invention also provides an electromagnetic detection device in the frequency domain near the source region, including:

[0069] Obtaining module, is used for obtaining the vertical magnetic field intensity of observation point;

[0070] The first calculation module is used to obtain the primary field intensity generated by the emission source at the observation point according to the length of the emission source, the emission current and the coordinates of the observation point;

[0071] The second calculation module is used to subtract the primary field strength from the vertical magnetic field strength to obtain the pure induction field strength at the observation point;

[0072] The inversion module is used to extract the formation resistivity and depth information from the pure induction field strength by using inversion technology.

[0073] As an implementation manner of this embodiment, the distance between the observation point and the emission sour...

Embodiment 3

[0078] An embodiment of the present invention provides an electronic device, specifically, the electronic device includes a processor and a storage device; a computer program is stored on the storage device, and when the computer program is run by the processor, it performs electromagnetic detection in the near-source region frequency domain method.

[0079] The present invention also provides a storage medium, the storage medium stores machine-executable instructions, and when the machine-executable instructions are invoked and executed by a processor, the machine-executable instructions cause the processor to realize the near-source region Frequency domain electromagnetic detection method.

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Abstract

The invention discloses a near-source region frequency domain electromagnetic detection method and device, electronic equipment and a storage medium. The method comprises the steps that the vertical magnetic field intensity of an observation point is acquired; according to the length of the emission source, the emission current and the coordinates of the observation point, obtaining the primary field intensity generated by the emission source at the observation point; subtracting primary field intensity from the vertical magnetic field intensity to obtain pure induction field intensity of the observation point; and stratum resistivity and depth information is extracted from the pure induction field intensity by using an inversion technology. By adopting the technical scheme of the invention, the primary field generated by the emission source can be eliminated, and the earth electrical information only induced by the earth can be obtained.

Description

technical field [0001] The invention belongs to the technical field of geophysical exploration, and in particular relates to an electromagnetic detection method and device, electronic equipment, and a storage medium in a near-source region frequency domain. Background technique [0002] Traditional artificial source frequency detection methods generally observe a set of orthogonal horizontal electric and magnetic field components, and require the observation distance to meet the requirements of the far zone, that is, greater than 6 times the skin depth, to ensure that the electromagnetic wave is similar to a vertically incident plane wave. Because the electromagnetic field in the near area does not have the property of plane wave, the traditional method cannot be used. In fact, when the observation distance is greater than 1 times the skin depth, the electromagnetic field has the ability to detect the earth, but when it is closer to the emission source, the anomalous field i...

Claims

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Application Information

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IPC IPC(8): G01V3/08G01V3/38
CPCG01V3/08G01V3/38Y02A90/30
Inventor 陈卫营薛国强宋婉婷雷康信吕鹏飞
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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