Resistivity measurement method based on vertical components of electromagnetic field

A vertical component and measurement method technology, applied in the fields of earth science and geophysics, can solve problems such as difficult to accurately reflect, and achieve the effects of high implementation efficiency, improved resolution, and high resolution

Inactive Publication Date: 2019-06-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It responds obviously to substances with large electrical contrast, large volume, and shallow burial, and it is difficult to identify objects with small electrical contrast or deep burial. This is determined by the inherent defects of the resistivity expression defined by the horizontal component of the e

Method used

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  • Resistivity measurement method based on vertical components of electromagnetic field
  • Resistivity measurement method based on vertical components of electromagnetic field
  • Resistivity measurement method based on vertical components of electromagnetic field

Examples

Experimental program
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Effect test

Embodiment 1

[0052] The invention provides a resistivity measurement method based on the vertical component of the electromagnetic field, and the implementation process for the case of one-dimensional and two-dimensional media is as follows:

[0053] (1) Measure the vertical component E of the electric field z and the vertical component H of the magnetic field z time series, such as figure 1 shown;

[0054] (2) Calculate the vertical impedance at a given frequency

[0055] (3) Obtain the resistivity ρ at a given frequency EH⊥ :

[0056]

[0057] Case 1

[0058] The vertical component E of the electric field measured under the 2D model z and the vertical component H of the magnetic field z And the apparent resistivity calculated by formula (11) is as follows:

[0059] Frequency (Hz) h z (×10 -2 nT)

Embodiment 2

[0061] The invention provides a resistivity measurement method based on the vertical component of the electromagnetic field, and the implementation process for the three-dimensional medium is as follows:

[0062] (1) Measure the vertical component E of the electric field z and the vertical component H of the magnetic field z time series of

[0063] (2) Calculate the vertical impedance at a given frequency

[0064] (3) Obtain the resistivity ρ at a given frequency EH⊥ :

[0065]

[0066] in,

[0067] Case 2

[0068] The vertical component E of the electric field measured under the 3D model z and the vertical component H of the magnetic field z And the apparent resistivity calculated by formula (13) is as follows:

[0069] Frequency (Hz) h z (nT)

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Abstract

The present invention discloses a resistivity measurement method based on vertical components of an electromagnetic field, belonging to the fields of earth sciences and physical geography. According to the method, under the excitation of a vertical incident plane to the vertical components of the electromagnetic field, the upper and lower sides of the boundary have inductive charges to cause a discontinuous electric field and changed vertical components of the field, the change appears at the upper and lower sides of the boundary so as to accurately reflect the positions of the upper and lowerboundaries of an object. The [Rho]EH T-inverted definition equation provided by the invention improves the resolution capability for the upper and lower interfaces of an electricity anomalous body due to direct reference of the discontinuity of the electric field on the upper and lower interfaces, and the resolution capability is only related to the electricity contrast ratio and the burying of the anomalous body and is not related to the size of the anomalous body so as to have important meaning for accurate detection of a small anomalous body in a superficial layer and the depth fine detection of the mineral resources in the engineering geophysics. The resistivity measurement method based on vertical components of an electromagnetic field is not better sensitive to the noise response inthe impedance Z than a Cagniard resistivity formula.

Description

technical field [0001] The invention belongs to the fields of earth science and geophysics, and in particular relates to a resistivity measurement method based on the vertical component of an electromagnetic field. Background technique [0002] In the 1920s, French scholars C. Schlumberger and M. Schlumberger (C.&M.Schlumberger) brothers first studied and tested the DC resistivity method, and defined it through the device coefficient and the observed potential and current. Representation of apparent resistivity. The AC resistivity method in the modern sense—Magnetotelluric (MT), uses the observed horizontal electric field and the horizontal magnetic field orthogonal to it to define the resistivity expression, which is called "Carniard resistance". rate”, which laid the theoretical foundation of the magnetotelluric method; at the same time, due to the large detection depth of the magnetotelluric method, it has developed rapidly in practical applications and is widely used in...

Claims

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Application Information

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IPC IPC(8): G01V3/08
Inventor 严家斌
Owner CENT SOUTH UNIV
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