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Method and system for displaying quasi-seismic profile of electromagnetic data based on normalized function

A technology of electromagnetic data and seismic section, applied in radio wave measurement system, electrical/magnetic exploration, geophysical measurement, etc., can solve inversely proportional reduction, Carnia apparent resistivity formula is not applicable, and it is difficult to guarantee data quality And other issues

Active Publication Date: 2022-07-01
青海省第三地质勘查院
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Problems solved by technology

[0003] However, the Kania apparent resistivity profile in the traditional controllable source electromagnetic method generally only reflects the abnormal response law of the "far zone". From the expressions of the components of the electric field and magnetic field, it can be seen that the strength of the signal is equal to the transmitting and receiving distance of 3 power (E x ), or even to the 4th power (H z ) decreases inversely proportional to
Therefore, the "far zone" electromagnetic signal is weak and the signal-to-noise ratio is low. Under the condition of the same power supply, it is difficult to guarantee the data quality
[0004] Secondly, the Carnia apparent resistivity formula is not applicable to the "near zone" and "transition zone", and it is difficult to reflect the abnormal response characteristics of the "transition zone" and "near zone", so it is difficult to make full use of the data in the whole region to realize electromagnetic detection
[0005] Finally, the traditional display method of apparent resistivity contours is processed by regular grids, which highlights the overall abnormal characteristics of the section, but it is difficult to reflect the abnormal response variation law of different frequencies of single-channel data

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  • Method and system for displaying quasi-seismic profile of electromagnetic data based on normalized function
  • Method and system for displaying quasi-seismic profile of electromagnetic data based on normalized function
  • Method and system for displaying quasi-seismic profile of electromagnetic data based on normalized function

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Embodiment 2

[0066] A kind of electromagnetic data pseudo-seismic section display method based on normalization function of the present invention is adopted, and the present invention is described in detail by taking theoretical model data (normalized electromagnetic anomaly data of uniform layered medium) as an example:

[0067] In the cylindrical coordinate system, the electromagnetic field component expression in the frequency domain that only considers the grounding conductor power supply on the horizontal layered earth is (He Jishan, 1990; Tang Jingtian et al., 2005):

[0068]

[0069] In the formula, E r , H r , H z is the electromagnetic field component, I is the power supply current amplitude, dL is the length of the dipole source, r is the transceiver distance, is the angle between the dipole and the transceiver distance, μ is the free space permeability, ω is the circular frequency, k is the wave number, R and R * The expression is:

[0070]

[0071] Convert the ...

Embodiment 3

[0088] A uniform layered medium model is designed to illustrate the method for displaying the quasi-seismic section of the electromagnetic data of the normalized function in this embodiment. Calculation parameters: select 51 frequency parameters at medium intervals in the logarithmic interval, and the highest frequency is 10 4 Hz, minimum frequency is 10 -1 Hz; the horizontal electric dipole source is arranged along the y direction at the origin of the surface coordinates, the dipole distance is 1m, the emission current amplitude is 1A, the sending and receiving distance is from 200m to 20km, and the samples are uniformly sampled at 200m intervals.

[0089] 1. Low-resistance thin layer model

[0090] Design an H-type three-layer geoelectric model (this H-type three-layer geoelectric model is a low-resistance thin-layer model) See figure 2 , the resistivity of the three layers is 100Ω·m, 20Ω·m and 100Ω·m in turn, the thickness of the first layer is fixed at 1000m, the thickn...

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Abstract

The invention relates to a method and system for displaying pseudo-seismic section of electromagnetic data based on a normalization function. Wherein, the method for displaying the seismic profile includes: S1, obtaining the normalized data of the electric field or magnetic field data collected according to the preset information through a normalization function; the preset information includes: the number of measuring points , the number of frequency points of each geodesic, the distance between the measuring points, the frequency spacing in the log10 domain, and the magnification of the electric field or magnetic field data amplitude; S2. Based on the normalized data, synthesize the electromagnetic profile of the seismic profile. Based on the normalized electromagnetic data, the present invention adopts the seismic-like time or depth profile display mode to obtain the normalized value of the electric field or magnetic field data through the normalization function (the normalized value reflects its abnormal response), Furthermore, it can be displayed in the form of a seismic-like profile, which can not only reflect the abnormal response characteristics of the two-dimensional or three-dimensional data in the whole area, but also reflect the abnormal change law of each data trace.

Description

technical field [0001] The present invention relates to the technical field of seismic section display, in particular to a method and system for displaying a pseudo-seismic section of electromagnetic data based on a normalized function. Background technique [0002] The traditional apparent resistivity profile generally calculates the apparent resistivity according to the Carnia formula, and displays the abnormal response amplitudes of apparent resistivity at different frequencies in the form of contour lines. [0003] However, the Kania apparent resistivity profile in the traditional controllable source electromagnetic method generally only reflects the abnormal response law of the "far zone". From the expressions of the various components of the electric field and the magnetic field, it can be seen that the strength of the signal is related to the sending and receiving distance 3 power (E x ), even the fourth power (H z ) decreases inversely proportionally. Therefore, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01V3/38G01V3/08
CPCG01V3/38G01V3/08
Inventor 王金海才智杰詹俊林佳富钟明峰赵丽萍
Owner 青海省第三地质勘查院
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