基于单程波算子的全波场最小二乘偏移方法

doi:10.13810/j.cnki.issn.1000-7210.2023.05.011

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Abstract Traditional migration methods are based on the assumption that the wave field reflects once. In fact, complete seismic imaging should be the contribution of all the subsurface wavefields (primaries and multiples). To improve the imaging quality with full wavefield information, this paper studies full wavefield least squares migration (FW-LSM) based on a one-way propagation operator. Firstly, the upper and lower reflection coefficients are introduced to derive the forward operator based on a one-way propagation operator with closed-loop continuation and simulate full wavefield information under the smooth velocity model. Secondly, 2-norm-based least squares error functional and gradient term expressions of the full wavefield are solved to construct the least squares migration according to the inversion framework. Finally, the validity of the proposed method is tested by the lens model and Marmousi model with a water layer. Additionally, multiple inversion iterations suppress crosstalk generated by complex wavefields, and the imaging quality is significantly improved by adopting multiple reflection wave information. This study provides new seismic imaging methods and is of practical and popularization values, especially for seismic data processing in deep marine areas with strong multiples.

Key words： full wavefield least squares migration one-way wave multiple waves seismic imaging

Received: 07 December 2022

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P631

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	Articles by authors
	YE Yueming
	ZHONG Shichao
	FAN Guozhang
	REN Haoran
	WANG Zhaoqi

Cite this article:

YE Yueming,ZHONG Shichao,FAN Guozhang等. Least squares migration of full wavefield based on one-way wave operator[J]. OGP, 2023, 58(5): 1142-1151.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2023.05.011 OR http://www.ogp-cn.com/EN/Y2023/V58/I5/1142

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