Ore body position determination method and system based on complex resistivity parameters

A technology of complex resistivity and determination method, applied in the field of complex resistivity data processing, can solve the problems of poor fitting of electrical dispersion data, inaccurate ore body position, and unsatisfactory effects of the four parameters of the Cole-Cole model. To achieve the effect of improving the accuracy and improving the resolution

Active Publication Date: 2021-02-23
BEIJING RES INST OF URANIUM GEOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the Dias model can better describe the influence of various polarization mechanisms, but the model has many parameters and has strong multiple solutions, and it is rarely used in the actual complex resistivity method inversion; The electrical dispersion data whose dispersion range exceeds two orders of magnitude is poorly fitted, so it is greatly limited in actual data processing; currently, the Cole-Cole model is most widely used in complex resistivity inversion. The effect of the four parameters of the Cole-Cole model obtained by derivation is not particularly ideal, among which the inversion effect of zero-frequency resistivity and polarizability is better, and the inversion effect of frequency correlation coefficient and time constant is poor
Therefore, when determining the ore body position according to the zero-frequency resistivity, polarizability, frequency correlation coefficient and time constant, the obtained ore body position may not be accurate

Method used

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  • Ore body position determination method and system based on complex resistivity parameters
  • Ore body position determination method and system based on complex resistivity parameters
  • Ore body position determination method and system based on complex resistivity parameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Such as figure 1 As shown, a kind of orebody position determination method based on complex resistivity parameter provided by the present invention comprises:

[0066] Step 101: Obtain a Cole-Cole model.

[0067] Step 102: Reparameterize the Cole-Cole model to obtain a reparameterized Cole-Cole model. Step 102 specifically includes:

[0068] The time constant in the Cole-Cole model is replaced by a set time constant, and the polarizability in the Cole-Cole model is replaced by a phase angle to obtain a reparameterized Cole-Cole model. The time constant in the Cole-Cole model is replaced by a set time constant, the polarizability in the Cole-Cole model is replaced by a phase angle, and a reparameterized Cole-Cole model is obtained, which specifically includes:

[0069] Replace the time constant in the Cole-Cole model and the polarizability in the Cole-Cole model according to the following formula:

[0070]

[0071]

[0072]

[0073]

[0074] Among them, m...

Embodiment 2

[0096] The present invention also provides a specific method for determining the position of an ore body based on complex resistivity parameters, which reparameterizes the classic Cole-Cole model, including the following steps:

[0097] (1) Pelton et al. have proved that the Cole-Cole model can indeed describe the IP effect approximately by measuring a large number of rock and ore specimens and outcrops. The mathematical expression of the complex resistivity is:

[0098]

[0099] where ω is the angular frequency, ρ o is called the zero-frequency resistivity, m 0 is called the polarizability, τ is called the time constant, c is called the frequency correlation coefficient, ρ(ω) is the complex resistivity, and i is the imaginary part of the complex number. The angular frequency, zero frequency resistivity, polarizability, time constant and frequency correlation coefficient are collectively referred to as Cole-Cole model or complex resistivity spectrum parameters.

[0100] D...

Embodiment 3

[0179] Such as Figure 7 As shown, a kind of orebody position determination system based on complex resistivity parameter provided by the present invention comprises:

[0180] The obtaining module 201 is used to obtain the Cole-Cole model.

[0181] The reparameterization module 202 is configured to reparameterize the Cole-Cole model to obtain a reparameterized Cole-Cole model.

[0182] The sensitivity determination module 203 is configured to determine the sensitivity of the re-parameterized Cole-Cole model by using the complex resistivity value in the re-parameterized Cole-Cole model according to the re-parameterized Cole-Cole model.

[0183] The parameter inversion value determination module 204 is configured to use the sensitivity to perform inversion using the damped least squares inversion theory to obtain parameter inversion values ​​in the re-parameterized Cole-Cole model.

[0184] The ore body determination module 205 is configured to determine the position of the or...

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Abstract

The invention discloses an ore body position determination method and system based on complex resistivity parameters, and relates to the technical field of complex resistivity data processing. The orebody position determination method comprises the steps of: acquiring a Cole-Cole model; performing re-parameterization on the Cole-Cole model to obtain a re-parameterized Cole-Cole model; according to the re-parameterized Cole-Cole model, determining the sensitivity of the re-parameterized Cole-Cole model by using a complex resistivity value in the re-parameterized Cole-Cole model; performing inversion by using the sensitivity and a damping least square inversion theory to obtain a parameter inversion value in the re-parameterized Cole-Cole model; and determining the position of an ore body according to the parameter inversion value. The ore body position determination method and the system provided by the invention can improve the accuracy rate of determining the position of the ore bodyby using a complex resistivity model.

Description

technical field [0001] The invention relates to the technical field of complex resistivity data processing, in particular to a method and system for determining the position of an ore body based on complex resistivity parameters. Background technique [0002] Many researchers at home and abroad use different parameter combinations to describe the linear time-invariant system, reasonably express the conduction mechanism of various rocks (ores), and successively propose a variety of equivalent circuit models. In recent years, new complex resistivity models have been proposed, or improved models based on proven models. Among them, the Dias model can better describe the influence of various polarization mechanisms, but the model has many parameters and has strong multiple solutions, and it is rarely used in the actual complex resistivity method inversion; The electrical dispersion data whose dispersion range exceeds two orders of magnitude is poorly fitted, so it is greatly lim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/38
CPCG01V3/38
Inventor 张志勇刘祜汪硕黄笑王寒冰王春阳
Owner BEIJING RES INST OF URANIUM GEOLOGY
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