各向异性介质弹性波高斯束偏移方法

doi:10.13810/j.cnki.issn.1000-7210.2020.04.012

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Abstract Elastic wave Gaussian beam migration is a multi-component seismic imaging method with higher imaging accuracy and computational efficiency. By now more researches have focused on acoustic and elastic imaging of isotropic media and acoustic imaging of anisotropic media,but less on elastic wave migration of anisotropic media. This paper proposes the ray tracing equation of elastic wave in anisotropic media,derives the forward and backward continuation formulas of the elastic wave field in anisotropic media based on the Kirchhoff-Helmholtz integration of 2D anisotropic elastic wave and using the Green tensor characterized by elastic dynamics,and establishes an elastic Gaussian beam migration method for multicomponent seismic data of anisotropic media. In addition,the weight function is introduced into the imaging formula to suppress the crosstalk caused by different waveforms; and the sign function is introduced to facilitate the polarity inversion during converted wave imaging. Applications on a TTI sag model and a TTI multilayer model show that the imaging results of anisotropic elastic Gaussian beam migration have higher SNR,more continuous seismic events,and more accurate structural position than the similar isotropic migration. With multicomponent seismic data,and information of P-wave and S-wave fields,the method provides the imaging result with higher resolution. Moreover,it has better adaptability than the conventional imaging method based on scalar wave field.

Key words： anisotropic media ray tracing elastic wave polarity correction crosstalk Gaussian beam migration

Received: 19 December 2019

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P631

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	Articles by authors
	DU Xiangdong
	HAN Wenming
	CAO Xiangyang
	ZHANG Yingde
	ZHANG Shixin
	LIU Qiang

Cite this article:

DU Xiangdong,HAN Wenming,CAO Xiangyang等. Elastic Gaussian beam migration in anisotropic media[J]. OGP, 2020, 55(4): 804-812,830.

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http://www.ogp-cn.com/EN/10.13810/j.cnki.issn.1000-7210.2020.04.012 OR http://www.ogp-cn.com/EN/Y2020/V55/I4/804

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