Three-dimensional magnetotelluric forward value simulation method
A magnetotelluric and numerical simulation technology, applied in CAD numerical modeling, electrical/magnetic exploration, geophysical measurement, etc. Effect
Active Publication Date: 2021-10-26
CENT SOUTH UNIV
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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
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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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The invention discloses a three-dimensional magnetotelluric forward value simulation method. The method comprises the following steps of firstly, constructing a resistivity distribution model according to a target geologic body, then coarsening the resistivity distribution model through a multi-grid method, and dispersing a double-rotation equation on the coarse and fine grids through a staggered grid finite difference method to obtain a coefficient matrix; performing four-color partitioning processing on the discretized double-rotation equation, calculating the boundary conditions of the target geologic body model through a two-dimensional finite difference method, calculating a right-end item of the double-rotation equation on the fine grids, and finally solving by using a multi-grid method based on four-color partitioning Gauss-Seid smoothing; and changing a polarization mode and repeating the above process, and calculating the apparent resistivity and impedance phase of a corresponding measuring point according to an electric field component and a magnetic field component in different polarization modes. According to the method, the line block Gauss-Seid smoothing technology is adopted, the high-frequency residual components on the coarse and fine grids are effectively removed, the calculation efficiency of the multi-grid method is improved, and the purpose of rapid convergence is achieved.
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 ...
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Login to View More 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