Three-dimensional magnetotelluric anisotropy inversion method based on non-structural finite element method

An anisotropic and magnetotelluric technology, applied in instrumentation, design optimization/simulation, calculation, etc., can solve problems such as geological space inconsistency, low calculation efficiency, errors, etc., and achieve the effect of saving memory and high precision
CN113221393AActive Publication Date: 2021-08-06JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JILIN UNIV
Publication Date
2021-08-06

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Abstract

The invention discloses a three-dimensional magnetotelluric anisotropy inversion method based on a non-structural finite element method. The three-dimensional magnetotelluric anisotropy inversion method comprises the following steps: (1) obtaining and screening magnetotelluric sounding data with anisotropic characteristics for inversion; (2) constructing a conductivity tensor model by adopting a non-structural finite element method; (3) constructing a magnetotelluric regularization inversion objective function under the anisotropic medium condition; (4) performing forward modeling on the conductivity tensor model to obtain a predicted total impedance tensor corresponding to model response, and calculating a product of transpose and a vector of a sensitivity matrix along with forward modeling; (5) calculating the gradient of the magnetotelluric regularization inversion objective function; (6) calculating a model parameter update quantity by adopting an L-BFGS algorithm, and updating the model parameters according to the model parameter update quantity; (7) iteratively executing the step (4) to the step (6) until an iteration termination condition is reached, obtaining a parameter-optimized conductivity tensor model, and realizing three-dimensional magnetotelluric anisotropy inversion.
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Description

technical field

[0001] The invention belongs to the technical field of geophysical electromagnetic method inversion, and in particular relates to a three-dimensional magnetotelluric anisotropy inversion method based on an unstructured finite element method. Background technique

[0002] The magnetotelluric method can effectively detect the geoelectric structure deep in the earth by using natural low-frequency signals, and has the advantages of low cost, convenient work, no shielding by high-resistivity layers, and a wide range of exploration depths. It has been widely used in deep geological surveys, Exploration of underground resources such as minerals.

[0003] The purpose of magnetotelluric inversion is to deduce the real geoelectric structure distribution of the underground space through the electromagnetic response measured on the earth's surface, and to assist geological interpreters to obtain more accurate geological structure judgments. Regarding the magnetotelluric...

Claims

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