基于模拟退火法的磁共振测深多源谐波噪声压制方法

doi:10.11720/wtyht.2022.1158

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Abstract

When the magnetic resonance sounding (MRS) method is applied in an environment with high electromagnetic noise, the signal-to-noise ratio of the measured data is often reduced due to the interference of electromagnetic noise. As a result, it is difficult to accurately determine the aquifer distribution using the inversion results, thus reducing the application effects of the method. In this paper, aiming at the common problem of multi-source harmonic noise interference in the field data acquisition using the MRS method, this paper derives the grid search simultaneous removal method based on the model denoising and further proposes the more efficient simulated annealing simultaneous removal method. The simulation results show that both methods can effectively suppress multi-source harmonic noise. Compared with the grid search simultaneous removal method, the efficiency of the simulated annealing simultaneous removal method is improved by 2.35 times in the case of double fundamental frequency harmonics, which greatly reduces the time cost of the denoising process. Meanwhile, the simulated annealing simultaneous removal method allows for great denoising effects of multi-source harmonic noise. Finally, the proposed denoising algorithm was applied to a field example. The comparison of the inversion results and borehole data shows that the simulated annealing simultaneous removal method can effectively suppress the multi-source harmonic noise in the measured data obtained using the MRS method and can significantly improve the application effects of the method.

Key words： simulated annealing magnetic resonance sounding multi-source harmonic denoising

Received: 23 March 2021 Published: 25 February 2022

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	Articles by authors
	Liang CHEN
	Li-Heng FU
	Dong CAI
	Fan LI
	Zhen-Yu LI
	Kai LU

Cite this article:

Liang CHEN,Li-Heng FU,Dong CAI, et al. Suppression method of multi-source harmonic noise in magnetic resonance sounding based on simulated annealing method[J]. Geophysical and Geochemical Exploration, 2022, 46(1): 141-149.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2022.1158 OR https://www.wutanyuhuatan.com/EN/Y2022/V46/I1/141

Transmitting and receiving NMR signal in time domain of MRS

Spectrum characteristics of harmonic noise with double fundamental frequencies

Harmonic fundamental frequency grid search in frequency space

Time domain diagram of double fundamental frequency harmonics processed by grid search simultaneous removal method

Fundamental frequency search path of simulated annealing simulated annealing

迭代次数	RMSE/nV	E₀/nV	$T 2 *$ /ms	t/s
10	67.16±22.96	177.12±4.01	1038.44±522.84	3.19±0.29
30	37.89±23.20	184.84±8.65	489.32±175.95	8.89±0.68
50	26.72±21.20	186.83±8.86	465.99±78.27	13.76±0.74
75	22.42±5.56	188.93±3.68	366.05±28.97	20.05±0.86
100	15.69±3.77	193.06±2.04	334.47±13.16	25.68±0.88
150	14.60±3.71	193.64±2.25	330.44±11.83	38.45±1.78
200	13.14±3.54	194.33±1.71	325.34±11.36	50.40±1.89
500	11.46±2.61	195.10±1.75	320.59±7.54	123.76±4.18

Denoising effect of simulated annealing simultaneous removal method with different number of iterations

Simulated annealing simultaneous removal method suppressing Multi- source harmonic noise

Effect of simulated annealing simultaneous removal method in measured data processing

Envelope and fitting curve of each pulse moment after denoising

Measured data, inversion results and drilling results of a sounding point by MRS method in River Beach, Tianmen

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