Magnetotelluric three-dimensional forward modeling method based on spherical coordinate system

A magnetotelluric and spherical coordinate system technology, applied in the field of geophysical exploration, can solve the problems of inability to match the earth model and low accuracy, achieve good application effects, accurate impedance, and overcome calculation deviations

Active Publication Date: 2019-07-30
CHENGDU UNIVERSITY OF TECHNOLOGY
View PDF4 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The 3D forward modeling of geomagnetic sounding based on finite difference in the spherical coordinate system disclosed in this journal literature, in which geomagnetic sounding only observes and analyzes magnetic field signals to detect the deep electrical structure of the earth, and its effective signal fre

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Magnetotelluric three-dimensional forward modeling method based on spherical coordinate system
  • Magnetotelluric three-dimensional forward modeling method based on spherical coordinate system
  • Magnetotelluric three-dimensional forward modeling method based on spherical coordinate system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A three-dimensional magnetotelluric forward modeling method based on a spherical coordinate system, comprising the following steps:

[0035] a. Establish the magnetotelluric control equation;

[0036] b. In the spherical coordinate system, along r, θ, In the direction of the three coordinate axes, several parallel spherical surfaces are divided into several small inverted quadrangular prism grid units at different intervals;

[0037] c. Set the parameters of the spherical coordinate model, including grid node coordinates, elements, node numbers and element resistivity, and construct spherical coordinate interleaved grid elements with discrete magnetic fields;

[0038] d. Circulate the single frequency, numerically discretize the magnetotelluric governing equation in step a in the spherical coordinate staggered grid cell in step c, obtain the coefficient matrix and the right-hand term, and assemble them into the linear equation system;

[0039] e. Solve linear equatio...

Embodiment 2

[0043] A three-dimensional magnetotelluric forward modeling method based on a spherical coordinate system, comprising the following steps:

[0044] a. Establish the magnetotelluric control equation;

[0045] b. In the spherical coordinate system, along r, θ, In the direction of the three coordinate axes, several parallel spherical surfaces are divided into several small inverted quadrangular prism grid units at different intervals;

[0046] c. Set the parameters of the spherical coordinate model, including grid node coordinates, elements, node numbers and element resistivity, and construct spherical coordinate interleaved grid elements with discrete magnetic fields;

[0047] d. Circulate the single frequency, numerically discretize the magnetotelluric governing equation in step a in the spherical coordinate staggered grid cell in step c, obtain the coefficient matrix and the right-hand term, and assemble them into the linear equation system;

[0048] e. Solve linear equatio...

Embodiment 3

[0052] A three-dimensional magnetotelluric forward modeling method based on a spherical coordinate system, comprising the following steps:

[0053] a. Establish the magnetotelluric control equation;

[0054] b. In the spherical coordinate system, along r, θ, In the direction of the three coordinate axes, several parallel spherical surfaces are divided into several small inverted quadrangular prism grid units at different intervals;

[0055] c. Set the parameters of the spherical coordinate model, including grid node coordinates, elements, node numbers and element resistivity, and construct spherical coordinate interleaved grid elements with discrete magnetic fields;

[0056] d. Circulate the single frequency, numerically discretize the magnetotelluric governing equation in step a in the spherical coordinate staggered grid cell in step c, obtain the coefficient matrix and the right-hand term, and assemble them into the linear equation system;

[0057] e. Solve linear equatio...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a magnetotelluric three-dimensional forward modeling method based on a spherical coordinate system, and belongs to the technical field of geophysical exploration. The method comprises the following steps: a, establishing a magnetotelluric control equation; b, dividing the spherical coordinate system into a plurality of small inverted quadrangular prism grid units; c, setting spherical coordinate model parameters, and constructing a spherical coordinate staggered grid unit with a discrete magnetic field; d, cycling a single frequency, and performing numerical dispersionon the magnetotelluric control equation in the spherical coordinate staggered grid unit; e, solving a system of linear equations; and f, calculating impedance via a spherical coordinate tensor impedance formula, and then substituting the impedance into a Kania apparent resistivity calculation formula to figure out the apparent resistivity and phase at a measuring point. By adoption of the magnetotelluric three-dimensional forward modeling method disclosed by the invention, the interference of the earth curvature on the magnetotelluric three-dimensional deep detection can be effectively overcome, calculation errors caused by the earth curvature are avoided, the magnetotelluric three-dimensional forward modeling method is suitable for the numerical simulation of magnetotelluric three-dimensional forward modeling, and can be better matched with an earth model, and the accuracy is high.

Description

technical field [0001] The invention relates to the technical field of geophysical exploration, in particular to a three-dimensional magnetotelluric forward modeling method based on a spherical coordinate system. Background technique [0002] Magnetotelluric sounding is the main method to detect the deep electrical structure of the earth. By synchronously observing the electric field and magnetic field components on the surface, and qualitative or quantitative analysis, the electrical structure model of the earth within a certain depth range can be obtained. , Deep geological structure detection, geothermal and groundwater resource investigation, earthquake prediction and geological disaster prevention and other fields are widely used. [0003] Forward modeling is the core of geophysical methods. The essence of 3D forward modeling of magnetotellurics is to find the numerical solution of the 3D electromagnetic diffusion equation in complex media. The main calculation methods...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01V3/38G01V3/40
CPCG01V3/38G01V3/40
Inventor 王绪本罗威
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap