A 3D MT Forward Numerical Simulation Method

A magnetotelluric and numerical simulation technology, applied in CAD numerical modeling, electrical/magnetic exploration, geophysical measurement, etc., can solve problems such as low calculation efficiency, achieve fast calculation efficiency, accurate numerical simulation results, and speed up calculation efficiency Effect

Active Publication Date: 2021-11-30
CENT SOUTH UNIV
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Problems solved by technology

However, its calculation efficiency largely depends on the smoothing algorithm, and for the double-curl equation of the electromagnetic field, the calculation efficiency of the common smoothing algorithm is also low

Method used

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  • A 3D MT Forward Numerical Simulation Method
  • A 3D MT Forward Numerical Simulation Method
  • A 3D MT Forward Numerical Simulation Method

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Embodiment 1

[0142] In order to test the method proposed by the present invention, design such as image 3 The details of the low-high resistivity combined anomalous body model shown are as follows: there are low-resistivity anomalous bodies and high-resistive The combined anomalous bodies arranged horizontally in the direction are all 10km×10km×10km in size, the buried depth is 10km, and the interval is 10km; the air layer resistivity of the three-dimensional low-high resistance combined anomalous body model is , the background resistivity in the large formation is 100 , the resistivity of the low-resistance anomalous body is 10 , the resistivity of the high-resistance anomalous body is 1000 . Take the projection point of the midpoint between two abnormal bodies on the ground as the coordinate origin O, and the survey line is , Set 25 measuring points evenly spaced within the range of -25.5km to 25.5km.

[0143] If 32 × 32 × 32 cuboid units with a size of 2.5 km × 2.5 km × 2....

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Abstract

This application discloses a three-dimensional magnetotelluric forward numerical simulation method. Firstly, the resistivity distribution model is constructed according to the target geological body, and then the resistivity distribution model is coarsened by the multi-grid method, and the coarse-fine mesh is discretized by the staggered-grid finite difference method. The double-curl equation on the grid is obtained to obtain the coefficient matrix, and then the discretized double-curl equation is processed by 4-color blocks, and the boundary conditions of the target geological body model are calculated by the two-dimensional finite difference method, and the fine grid is calculated. The right-hand term of the upper double-curl equation is finally solved by using the multigrid method based on 4-color block Gauss-Seider smoothing; change the polarization mode and repeat the above process, according to the electric field component and magnetic field component in different polarization modes, Calculate the apparent resistivity and impedance phase of the corresponding measuring point. This application adopts the Gauss-Seider smoothing technology of line block, effectively removes the high-frequency residual components on the coarse and fine grids, improves the calculation efficiency of the multi-grid method, and achieves the purpose of rapid convergence.

Description

technical field [0001] The invention relates to the technical field of geophysics, in particular to a three-dimensional magnetotelluric forward numerical simulation method. Background technique [0002] Magnetotelluric prospecting is a method that utilizes the widely distributed natural variable electromagnetic field (10 -4 ~10 4 Hz) for the study of deep geological structures, because of its advantages of large detection depth, high work efficiency, and low expenditure cost, it is widely used in engineering exploration, metal and oil and gas resource exploration, and deep geodynamics research. Carrying out electromagnetic 3D forward and inversion accurately is the prerequisite for its wide application. [0003] In the forward numerical simulation of the three-dimensional electromagnetic method, it is necessary to solve the double-curl equation involving the curl of the magnetic field and the curl of the electric field, but this equation has abundant null spaces, and when ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G01V3/38G06F111/10
CPCG06F30/23G01V3/38G06F2111/10
Inventor 杨刚强柳建新郭荣文王永斐
Owner CENT SOUTH UNIV
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