Method and device for estimating magnetotelluric parameters

A magnetotelluric and parameter technology, which is applied in the field of estimating magnetotelluric parameters and can solve problems such as poor power spectrum estimation accuracy.

Active Publication Date: 2015-04-29
NO 722 RES INST OF CHINA SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of poor accuracy of power spectrum estimation in the prior art, an embodiment of the present invention provides a method and device for estimating magnetotelluric parameters

Method used

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  • Method and device for estimating magnetotelluric parameters
  • Method and device for estimating magnetotelluric parameters

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Embodiment 1

[0101] Embodiments of the present invention provide a method for estimating magnetotelluric parameters, see figure 1 , the method includes:

[0102] Step 101: Acquire electromagnetic field frequency domain signals of four components.

[0103] In this embodiment, the four components include the electric field in the x direction, the electric field in the y direction, the magnetic field in the x direction, and the magnetic field in the y direction. The time-domain signal of the electromagnetic field of the component is divided into multiple segments in the time domain and obtained by performing Fast Fourier Transform (Fast Fourier Transform, FFT for short).

[0104] Specifically, the multiple electric field frequency domain signals in the x direction are obtained by FFT of the electric field time domain signals in the x direction divided into multiple segments in the time domain, and the multiple electric field frequency domain signals in the y direction are the electric field ...

Embodiment 2

[0187] An embodiment of the present invention provides a device for estimating magnetotelluric parameters, see figure 2 , the device consists of:

[0188] The acquisition module 201 is configured to acquire electromagnetic field frequency domain signals of four components, the four components include an electric field in an x ​​direction, an electric field in a y direction, a magnetic field in an x ​​direction, and a magnetic field in a y direction, and the electromagnetic field frequency domain signals of each component include a plurality of electromagnetic field frequency domain signals Signal, a plurality of electromagnetic field frequency domain signals are obtained by performing fast Fourier transform on the corresponding components of the electromagnetic field time domain signal divided into multiple segments in the time domain;

[0189] The power spectrum determination module 202 is used to determine the power spectrum of the electromagnetic field frequency domain sig...

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Abstract

The invention discloses a method and a device for estimating magnetotelluric parameters, and belongs to the technical field of magnetotelluric sounding. The method comprises the steps that electromagnetic field frequency domain signals of four components are acquired, wherein the four components include an x-direction electric field, a y-direction electric field, an x-direction magnetic field and a y-direction magnetic field, and the electromagnetic field frequency domain signal of each component comprises a plurality of electromagnetic field frequency domain signals; power spectra of the electromagnetic field frequency domain signals of the four components are determined, wherein the electromagnetic field frequency domain signal of the same component has a plurality of auto-power spectra, and the electromagnetic field frequency domain signals of the two same components have a plurality of cross-power spectra; an iterative initial value of impedance and an iterative initial value of admittance are determined by adopting a median filtering algorithm; iteration is performed for several times on the power spectra by adopting the iterative initial value of the impedance and the iterative initial value of the admittance; a mean of the power spectra and updated impedance and admittance are obtained; and the mean of the power spectra and the updated impedance and admittance are output as the magnetotelluric parameters. The method improves the estimation accuracy.

Description

technical field [0001] The invention relates to the technical field of magnetotelluric sounding, in particular to a method and device for estimating magnetotelluric parameters. Background technique [0002] Magnetotelluric mehtod (MT for short) is a method that uses natural electromagnetic fields as field sources, deploys instruments on the ground to measure electromagnetic field signals, analyzes and processes them, and then detects the electrical characteristics of underground materials. [0003] At present, the least square method is generally used to select the initial value of the iteration, and several iterations are performed according to the electromagnetic field signal to determine the power spectrum and impedance of the electromagnetic field signal, and then infer the earth resistivity at different depths (the physical quantity used to represent the characteristics of the earth resistance). to the electrical characteristics of underground materials. [0004] In th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/08
Inventor 曾歌明张杨勇张斌刘谋荣张亚丽
Owner NO 722 RES INST OF CHINA SHIPBUILDING IND
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