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Controllable source electromagnetic simulation wave number sequence optimization method based on elimination strategy

A technology of electromagnetic simulation and optimization method, which is applied in design optimization/simulation, complex mathematical operation, special data processing application, etc. It can solve the problem that the optimal wave number selection method cannot be proposed and cannot meet the calculation accuracy requirements of ocean controllable source electromagnetic forward modeling. and other problems, to achieve the effect of improving speed and computing efficiency, fast computing speed and high efficiency

Pending Publication Date: 2021-07-30
OCEAN UNIV OF CHINA
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Problems solved by technology

The above methods only obtain the optimal wave number sequence in the direct current method, which cannot meet the calculation accuracy requirements of ocean controllable source electromagnetic forward modeling
Shen Jinsong (2008) analyzed the numerical simulation of the electromagnetic response in the frequency domain in two-dimensional media, and analyzed the influence of the optimal value range of the wave number and the number of value points on the numerical simulation results in the two-dimensional frequency domain, and believed that the selection and value of the wave number sequence range It has a great influence on the numerical simulation results, but no specific optimal wavenumber selection method is proposed

Method used

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  • Controllable source electromagnetic simulation wave number sequence optimization method based on elimination strategy
  • Controllable source electromagnetic simulation wave number sequence optimization method based on elimination strategy
  • Controllable source electromagnetic simulation wave number sequence optimization method based on elimination strategy

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Embodiment 1

[0028] The invention provides a controllable source electromagnetic simulation wavenumber sequence optimization method based on elimination strategy. The method adjusts the relative position of each node of the wavenumber sequence by solving the problem of optimizing the electromagnetic field response of the wavenumber simulation and the minimum value of the target data, based on redundancy The elimination strategy of wave number gradually eliminates redundant wave numbers by optimizing wave number algorithm 1 and optimizing wave number algorithm 2, and finally obtains an optimized wave number sequence. Therefore, the optimized wavenumber sequence composed of a small number of wavenumber nodes is used to obtain simulation results with high precision, which greatly improves the speed and efficiency of simulation calculation.

[0029] see figure 1 , a wavenumber sequence optimization method for controllable source electromagnetic simulation based on elimination strategy, which ...

Embodiment 2

[0061] As we all know, the case of resistivity anisotropy is more complicated than that of resistivity isotropy. When ocean controllable source forward modeling performs wave number domain and time domain conversion, the case of resistivity anisotropy needs a relatively denser wave number sequence to obtain Same Fourier transform calculation accuracy as resistivity isotropy. In order to illustrate the effectiveness and adaptability of this algorithm, a more complex case of resistivity anisotropy will be selected for discussion in the optimal wavenumber calculation example.

[0062] see figure 2 , is a schematic diagram of the structure of the one-dimensional resistivity anisotropy model. In order to compare the accuracy of different wavenumber sequences, based on figure 2 The model shown is taken as an example to carry out forward calculation with different wavenumber sequences. It is assumed that the seawater layer with a depth of 300m is isotropic in resistivity, and its...

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Abstract

The invention provides a controllable source electromagnetic simulation wave number sequence optimization method based on an elimination strategy. The method comprises the following steps: initializing an input variable; adjusting the position of a wavenumber sequence node based on a least square fitting method; eliminating the redundant wave number of the minimum spacing position by using an optimized wave number algorithm I; eliminating a redundant wave number at a non-minimum spacing position by using an optimized wave number algorithm II; judging whether the optimized wavenumber sequence is the same as the initial wavenumber sequence or not; and outputting a final optimized wavenumber sequence. The obtained optimized wavenumber sequence can have more reasonable position distribution compared with a traditional wavenumber sequence obtained at a logarithm equal interval, and the number of nodes included on the premise that the same calculation precision is obtained is smaller, so that the simulation calculation speed and the calculation efficiency can be improved. Compared with an existing wave number optimization algorithm, the algorithm provided by the invention has the characteristics of high calculation speed, high efficiency and adaptability to simulation of a complex resistivity anisotropy model.

Description

technical field [0001] The invention relates to the technical field of marine geophysical numerical simulation, in particular to an optimization method for controllable source electromagnetic simulation wave number sequence based on an elimination strategy. Background technique [0002] Controlled source electromagnetic method (CSEM) is a geophysical method widely used in resource exploration. A large number of model simulation operations are required for controllable source electromagnetic data processing, inversion and interpretation, and the realization process involves the conversion of the solution domain, such as wave number-space domain conversion. For the simulation of complex anisotropic layered media and 2.5-dimensional numerical simulation, it is necessary to calculate the corresponding response of the wave number sequence, and then use the digital filtering algorithm to realize the wave number-space domain conversion. Therefore, the number and distribution of wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F17/18
CPCG06F30/20G06F17/18
Inventor 罗鸣李予国裴建新刘颖封常青
Owner OCEAN UNIV OF CHINA
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