基于SVD的小尺度地质体地震绕射波成像

doi:10.11720/wtyht.2019.1306

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Abstract

Diffraction originating from small-scale bodies is treated as noise in routine processing;however,it contains much information about the small-scale geological bodies,which may improve the resolution of the image.The first step of diffraction imaging is separating diffraction from the full record,since the energy of the diffraction is much weaker than the reflection.In this paper,the authors studied diffraction imaging which was separated directly on shot gather by using SVD algorithm.Compared with other separation methods,the theory and achievement of the separation directly on shot gather are easier.Numerical results show that SVD can separate diffraction from the full record well,even when noise is added to the data.The key of the method is to solve the problem as to which parts of the singular values should be intercepted while the remains could be used to reconstruct the wave-field,which requires testing various kinds of data.The results of the diffraction wave imaging are useful for the identification of small-scale geological bodies,and integrating diffraction wave imaging results with full wave imaging results can lead to a better interpretation.

Key words： small-scale body seismic diffraction imaging SVD

Received: 21 August 2018 Published: 25 October 2019

P631.4

Corresponding Authors: Bin LIU E-mail: liugele@163.com

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	Jun XU
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Cite this article:

Jun XU,Bin LIU,Qing-Xian ZHAO. Seismic imaging of small-scale geological body using diffraction wave based on SVD algorithm[J]. Geophysical and Geochemical Exploration, 2019, 43(5): 1074-1082.

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https://www.wutanyuhuatan.com/EN/10.11720/wtyht.2019.1306 OR https://www.wutanyuhuatan.com/EN/Y2019/V43/I5/1074

numerical model for small-scale bodies

Parameters of the small-scale bodies

Shot record before (a) and after (b) NMO

The distribution of singular value after SVD used in 8th shot record

The distribution of individual singular value's energy(a) and accumulative singular value's energy(b) in 8^th shot record

Diffraction wave extracted with different cut-off parameters
a—60%;b—70%;c—80%;d—90%

The original 8^th shot record (a),diffraction (b) and the difference (c) between figure a and figure b

The separation result when 25% noise is presented

The separation result when 50% noise is presented

The separation result when 100% noise is presented

Full wave-field imaging(a) and diffraction imaging for data with(c) and without(b) noise

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