Magnetotelluric forward modeling method and device based on ground-air decomposition strategy and storage medium

Abstract

The invention discloses a magnetotelluric forward modeling method and device based on a ground-air decomposition strategy and a storage medium. The method comprises the following steps: constructing ageoelectric geometric model for solving a three-dimensional MT of a region according to digital terrain data (DEM); discretizing the geoelectric geometric model into a series of tetrahedron units; obtaining an integral weak solution form satisfied by A-phi-psi coupling potential three-dimensional MT forward modeling based on a ground-air decomposition strategy, and performing node discretization-based conversion on the integral weak solution form to obtain a sparse linear equation set; loading a right-end term of the incident field placed in the sparse linear equation set and solving the sparse linear equation to obtain a vector bit A, a scalar bit phi and a scalar bit psi of each node of the tetrahedron unit in the solving area; calculating parameters of the observation point according to the vector bit A, the scalar bit phi and the scalar bit psi. The method has a promotion effect on large-scale three-dimensional magnetotelluric method inversion research, and has important practicalsignificance and value for promoting subject development and improving the academic level of electromagnetic method data interpretation.

Description

technical field [0001] The invention belongs to the technical field of applied geophysics, and in particular relates to a magnetotelluric forward modeling method, device, and storage medium based on an earth-space decomposition strategy. Background technique [0002] The magnetotelluric method (MT) is a geophysical exploration method that uses natural alternating electromagnetic field sources to detect the electrical structure of the earth's interior. It is widely used in mineral resource exploration, oil and gas and natural gas resource exploration, geothermal resource exploration and deep geology. Research in the field of structural detection and other fields, and achieved good application results. [0003] At present, any complex field exploration environment will directly affect the accuracy of magnetotelluric data interpretation, such as the exploration area transitioning from a gentle area to a complex mountainous area; secondly, the emergence of large-scale three-dime...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a magnetotelluric forward modeling method based on the ground-space decomposition strategy, which is based on the ground-space decomposition strategy A-Φ-Ψ coupling potential Realized three-dimensional MT adaptive finite element forward modeling, which can realize efficient and high-precision forward calculation. This technology overcomes the problems of poor condition number, low solution efficiency and poor precision faced by traditional MT solution systems, and has high efficiency, high precision and The ability of high stability provides the core driving force for the inversion and interpretation of large-scale 3D magnetotelluric measured data

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