Frequency-wavenumber implementation for P- and S-wave separation from multi-component seismic data

Zhiyuan Li; Xiaona Ma; Chao Fu; Bingluo Gu; Guanghe Liang

doi:10.1071/EG14047

ISSN: 0812-3985
E-ISSN: 1834-7533

Frequency-wavenumber implementation for P- and S-wave separation from multi-component seismic data
Authors Zhiyuan Li^a,d, Xiaona Ma^a,b, Chao Fu^c, Bingluo Gu^a,b and Guanghe Liang^a
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^a Institute of Geology and Geophysics, Chinese Academy of Sciences, No. 19, Beitucheng Western Road, Chaoyang District, Beijing 100029, China. ^b College of Earth Sciences, University of Chinese Academy of Sciences, No. 19A, Yuquan Road, Beijing 100049, China. ^c Shenhua Geological Exploration Co. Ltd, No. 22, West Riverside Road, Dongcheng District, Beijing 100011, China. ^d Corresponding author. Email: [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: Exploration Geophysics, Volume 47, Issue 1, Mar 2016, p. 32 - 43
DOI: https://doi.org/10.1071/EG14047
- Received: 05 May 2014
- Accepted: 04 Feb 2015
- Published online: 01 Mar 2016

Abstract

In this paper, we present a frequency-wavenumber domain scheme to separate P- and S-waves from multi-component seismic data at the free surface. Based on the relationship between the P- and S-wave separated elastic equation, and the divergence and curl operators, we modify the equation to make it applicable to surface seismic data. In the modified equation, the P-wavenumber is chosen to reject the P-waves, and the S-wavenumber is chosen to eliminate the S-waves. The changes in the P-S amplitude ratio caused by the wavenumber choice are corrected. For the free surface condition, an up-going wavefield separation filter is introduced into the modified equation, which can remove the free surface effects from the surface seismic data. In the case of a free surface exhibiting lateral heterogeneity, the seismic data are first transformed into the frequency domain using the fast Fourier transform (FFT), and then are transformed into the wavenumber domain using the discrete Fourier transform (DFT). In the second transform using the DFT, the modified equation is used to separate the P- and S-waves. Numerical tests on synthetic data for three models demonstrate the good performance and accuracy of the scheme.

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/content/journals/10.1071/EG14047

Frequency-wavenumber implementation for P- and S-wave separation from multi-component seismic data

Exploration Geophysics 47, 32 (2016); https://doi.org/10.1071/EG14047

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Article Type: Research Article

Keyword(s): divergence and curl; frequency-wavenumber domain; multi-component seismic data; P- and S-wave separation

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Frequency-wavenumber implementation for P- and S-wave separation from multi-component seismic data

Abstract

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