基于改进迭代去噪法的多震源地震数据分离

doi:10.11720/wtyht.2019.0044

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Abstract

Compared with single source acquisition method,simultaneous source acquisition technology can greatly increase field acquisition efficiency,and the separation of blended data is the key.When pseudo-segregated records of mixed simultaneous source data are sorted from common gathers to other gathers,the seismic signals of secondary sources show random noise,which can be separated by iterative denoising method.In this paper,the traditional iterative prediction denoising method is improved by adding the last separation result before each denoising to increase the stability of the iterative denoising,and combining with Multidirectional Vector Median Filtering to remove random noise.Through the separation test of simultaneous source mixed data of theoretical model,it is shown that the proposed method has better separation effect and is more robust,and can be operated under the condition of different parameters and maintain certain stability.Finally,the method is applied to the separation of Simultaneous Source Marine Line data,and a better separation result can be obtained.The method has practical application value.

Key words： simultaneous source acquisition separation of the blended data iterative prediction noise power subtraction technique multidirectional vector median filter

Received: 18 January 2019 Published: 25 October 2019

P631.4

Corresponding Authors: Jing-Wang CHENG E-mail: chjw2008@126.com

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	Jian-Hong GUO
	Jing-Wang CHENG
	Zhi-Ruo CHEN
	Bing YANG
	Hao YAN

Cite this article:

Jian-Hong GUO,Jing-Wang CHENG,Zhi-Ruo CHEN, et al. Seismic data separation of simultaneous source based on an improved iterative denoising method[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 1054-1063.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.0044 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/1054

Common offset gather contrast picture
a—traditional single source gather;b—multi-source blended excitation gather

Blended excitation mode and shot time
a—blended mode;b—random excitation of multiple sources

Common-shot gather seismic record
a—the 50^th single source;b—the 110^th single source;c—the 50^th blended source

Comparison of denoising results of common detection point gathers
a—iterative prediction subtraction method(the main source);b—the method of this paper(the main source);c—iterative prediction subtraction method(the secondary source);d—the method of this paper(the secondary source)

Signal-noise ratio iterative curve
a—signal-noise ratio of the main source after separation;b—signal-noise ratio of the secondary after separation

Comparison of denoising results with different filtering parameters

Comparison of separation effect of blended excitation
a—comparison of signal-noise ratio of the main source;b—comparison of signal-noise ratio of the secondary

The separation results of fiftieth blended source
a—the 50^th signal source record separated by this paper method;b—the 110^th signal source record separated by this paper method;c—the 50^th signal source record separated by regular method;d—the 110^th signal source record separated by regular method

Blended acquisition technique for offshore multiple seismic sources
a—actual data of offshore single source excitation;b—blended multi-source data(top 3000 time windows)

The thirty-second common offset gather and denoising results
a—the main source common offset gather;b—denoising results for figure a;c—the secondary source common offset gather;d—denoising results for figure c

Separation record of actual blended source
a—the main source after separation of the 32^nd blended source;b—the secondary source after separation of the 32^nd blended source

Comparison of Separation record of actual blended source
a—partial data of single source excitation at sea 32^nd blended source;b—partial data after separation of 32^nd blended source

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