Three-dimensional Numerical Simulation Method Based on Arbitrary Dipole-Dipole Device

A technology of three-dimensional numerical and simulation methods, applied in CAD numerical modeling, measuring devices, electrical/magnetic exploration, etc., can solve problems such as limited three-dimensional information, inconvenient construction, and too dense measurement data

Active Publication Date: 2021-04-23
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 layout, and difficult to construct in areas with complex terrain;
[0009] 3) The measurement data may be too dense, resulting in a waste of construction resources
[0010] Although the construction method of forming a 3D survey network with 2D survey lines is simple and feasible, it is difficult to obtain high-precision imaging results due to the limited 3D information of underground targets acquired by 2D survey lines.

Method used

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  • Three-dimensional Numerical Simulation Method Based on Arbitrary Dipole-Dipole Device
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  • Three-dimensional Numerical Simulation Method Based on Arbitrary Dipole-Dipole Device

Examples

Experimental program
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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] like 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 width...

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 numerical simulation method of a direct current excitation method based on an arbitrary dipole-dipole device. Calculation of electric field of background resistivity model; calculation of normalized transfer function of resistivity and polarizability of measured data; calculation of normalized transfer function of resistivity and polarizability of theoretical model. The method of the present invention can realize the whole-area observation three-dimensional numerical simulation of the three-dimensional DC IP arbitrary dipole-dipole device under complex conditions, and is not limited by the zero line of the electric field. It is suitable for exploration in complex environments; it can obtain more abundant three-dimensional information of underground targets, and provides preparatory conditions for inversion imaging of anisotropic media; and the method of the present invention has large shape differences, rich polarization information and high resolution It can effectively improve the calculation accuracy of numerical 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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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G01V3/08G06F111/10
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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