Three-dimensional numeral simulation method based on arbitrary dipole-dipole device for direct-current induced polarization method

A technology of three-dimensional numerical and simulation methods, which is applied in the fields of measuring devices, electrical digital data processing, and electrical/magnetic exploration, etc., and can solve the problems of inconvenient construction, difficult construction, and difficult current

Active Publication Date: 2018-02-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 1) Due to the use of single-pole-monopole or three-pole devices, it is difficult to supply large currents underground, and only shallow exploration can be carried out. In addition, due to the existence of "infinity" electrodes, field construction is inconvenient;
[0008] 2) All electrodes are connected to the same cable, resulting in inflexible field construction, very strict requirements for electrode ...

Method used

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  • Three-dimensional numeral simulation method based on arbitrary dipole-dipole device for direct-current induced polarization method
  • Three-dimensional numeral simulation method based on arbitrary dipole-dipole device for direct-current induced polarization method
  • Three-dimensional numeral simulation method based on arbitrary dipole-dipole device for direct-current induced polarization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0100] Example 1: 3D IP forward modeling of uplift structure model in horizontal terrain

[0101] Construct a three-dimensional double-layer dielectric uplift structure resistivity model, the first layer dielectric resistivity is 40Ω·m, polarizability is 0, and the thickness is 100m; the second layer dielectric resistivity is 100Ω·m, polarizability is 0; the uplift The structure is 150m away from the top interface, and the thickness is 100m. The top interface is 200m along the x direction and 360m along the y direction. , the resistivity of the lower layer medium is 100Ω·m, and the polarizability is 0.

[0102] Such as Figure 4 Shown is the cross-sectional view of the double-layer medium uplift structure model, in which, Figure 4 Middle (a) is the yz profile, in which the uplift structure is trapezoidal, with a top width of 360m, a bottom width of 760m, and a thickness of 100m; Figure 4 Middle (b) is the xz profile, in which the uplift structure is rectangular, with a wi...

Embodiment 2

[0128] Example 2: 3D IP forward modeling under complex undulating terrain conditions

[0129] designed as Figure 8 The resistivity model of the three-dimensional concave terrain structure shown (model yz profile), the resistivity of the model is 100Ω·m, and the polarization rate is 1%; the concave terrain is 30m away from the horizontal surface, the bottom of the terrain is the positive direction, and the side length It is 800m long; a low-resistance anomalous body with a resistivity of 20Ω·m and a polarizability of 20% is placed below the terrain. The anomalous body is 70m away from the top interface, has a thickness of 40m, and is 200m long along the x and y directions.

[0130] The effect of terrain on the normalized transfer function:

[0131] The normalized resistivity transfer function R ρ and the polarizability-normalized transfer function R η , where the dipole source S1 is located on the surface (such as image 3 shown). Calculated as Figure 9 As shown, compar...

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Abstract

The invention discloses a three-dimensional numeral simulation method based on an arbitrary dipole-dipole device for a direct-current induced polarization method. The three-dimensional numeral simulation method includes the steps of adopting a three-dimensional direct-current induced polarization arbitrary dipole-dipole device to carry out all-region observation and parameter measurement; calculating a specific resistance model of a normalized background electric field of actually measured data; calculating the normalized transmission functions of the specific resistance and polarizability ofthe actually measured data; calculating the normalized transmission functions of the specific resistance and polarizability of a theoretical model. According to the method, under complex conditions, all-region observation of three-dimensional numeral simulation of the three-dimensional direct-current induced polarization arbitrary dipole-dipole device can be achieved without limitation of null lines of an electric field, the distribution of electrodes is flexible, and as for an important exploring area, the density of measurement points can be enhanced freely, the method is capable of adaptingto exploration in a complex environment; more abundant three-dimensional information of an underground target body can be obtained, and preparation conditions can be provided for inversion imaging ofeach anisotropic medium; the method has the advantages of being big in morphological difference, abundant in polarization information, high in resolution ratio, and capable of effectively improving the calculation accuracy of numeral simulation.

Description

technical field [0001] The invention specifically relates to a three-dimensional numerical simulation method based on an arbitrary dipole-dipole device using a direct current excitation method. Background technique [0002] Geophysics is a comprehensive discipline that studies the earth and searches for mineral resources inside the earth through quantitative physical methods (such as seismic elastic waves, gravity, geomagnetism, geoelectricity, geothermal and radioactive energy, etc.). Earth's crust, mantle, core, and atmosphere. In recent years, the development of geophysics has become faster and faster, and people have paid more and more attention to it. [0003] The direct current induced electricity method is a very important detection method in geophysics. DC IP method can be divided into ground DC IP method, borehole DC IP method and tunnel DC IP method according to different excitation and observation conditions. Resource detection, archaeology, environmental and d...

Claims

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Application Information

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IPC IPC(8): G06F17/50G01V3/08
CPCG01V3/08G06F30/20
Inventor 张钱江戴世坤陈龙伟强建科李昆赵东东
Owner CENT SOUTH UNIV
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