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Three-dimensional controllable source electromagnetic forward modeling method and system

A forward modeling and electromagnetic technology, applied in the field of three-dimensional controllable source electromagnetic forward modeling methods and systems, can solve the problems of consuming large memory and being difficult to apply to ordinary notebooks, achieving the effects of low memory consumption, saving computing memory and improving computing efficiency

Pending Publication Date: 2022-05-27
CENT SOUTH UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-dimensional controllable source electromagnetic forward modeling method and system for the problem that the above-mentioned existing high-speed forward modeling consumes a large amount of memory, is suitable for high-performance servers and computer clusters, but is difficult to apply to ordinary notebooks

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  • Three-dimensional controllable source electromagnetic forward modeling method and system
  • Three-dimensional controllable source electromagnetic forward modeling method and system
  • Three-dimensional controllable source electromagnetic forward modeling method and system

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Embodiment Construction

[0053] The present invention provides a three-dimensional controllable source electromagnetic forward modeling method, which aims to improve forward modeling efficiency and reduce memory consumption. To this end, the model order reduction algorithm based on rational Krylov subspace constructs a Krylov subspace shared by multiple frequencies by selecting the optimal pole, and then projects the large-scale coefficient matrix into the subspace to obtain a reduced order matrix of smaller dimensions, reducing The inverse problem of the order matrix can be solved quickly, and then a rational approximation of the multi-frequency forward problem can be obtained quickly. Under the above-mentioned core mechanism, the present invention further sets the UPML absorption boundary. Due to the good absorption performance of the UPML medium for electromagnetic waves, the entire calculation area is greatly reduced, which further improves the solving speed of the equation and reduces the memory c...

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Abstract

The invention discloses a three-dimensional controllable source electromagnetic forward modeling method and a three-dimensional controllable source electromagnetic forward modeling system. The method comprises the following steps: carrying out grid division on a calculation region containing a measurement region; performing three-dimensional controllable source electromagnetic forward modeling on the basis of an electromagnetic field excited by a field source to obtain corresponding electric field intensity in the measurement area; wherein in the forward modeling process, a rational Krylov subspace is constructed by using a Lanczos algorithm in combination with a single optimal repeated pole; a rational Lanczos approximation expression of the electric field intensity to be solved is constructed by using the rational Krylov subspace; and finally, the electric field intensity is solved based on the rational Lanczos approximation expression. According to the method, 4-6 single-axis anisotropic PML layers are further arranged, meanwhile, UPML parameters of the lowest frequency are fixed, it is guaranteed that a mass matrix and a rotation matrix of a forward equation do not change along with the frequency, memory consumption of forward solving is greatly reduced in the whole forward solving process, and three-dimensional multi-frequency CSEM fast forward solving can be achieved on a common notebook computer.

Description

technical field [0001] The invention belongs to the frequency domain three-dimensional controllable source electromagnetic forward modeling method in the field of exploration geophysics, and particularly relates to a three-dimensional controllable source electromagnetic forward modeling method and system. Background technique [0002] With the needs of national economic construction and the advancement of science and technology, electromagnetic exploration has been paid attention to and developed, and it has played a great role in solving resource and environmental problems, determining deep structures, searching for deep ore bodies, and solving hydrological engineering problems. . [0003] Currently, one-dimensional or two-dimensional forward and inversion methods are mostly used to interpret controlled-source field data. Due to the three-dimensional nature of the actual geological structure, one-dimensional and two-dimensional inversions are likely to cause deviations in ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/12G06F17/16G06F17/17G06F30/23G06F111/10
CPCG06F17/12G06F17/16G06F17/17G06F30/23G06F2111/10Y02E60/00
Inventor 刘寄仁汤井田肖晓任政勇
Owner CENT SOUTH UNIV
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