ARTICLE

P-P wave and P-S converted wave separation and de-noising combining with SVD and f-k filtering

HONGYAN SHEN1,2 LI PAN2 QINGCHUN LI3 YUEYING YAN1 BAOWEI ZHANG4
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2 Mewbourne College of Earth and Energy, University of Oklahoma, Norman, OK 73019, U.S.A.,
4 Langfang Geophysical and Geochemical Exploration Institute, Langfang, Hebei 065000, P.R. China.,
JSE 2016, 25(2), 147–162;
Submitted: 4 February 2015 | Accepted: 20 December 2015 | Published: 1 April 2016
© 2016 by the Authors. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution -Noncommercial 4.0 International License (CC-by the license) ( https://creativecommons.org/licenses/by-nc/4.0/ )
Abstract

Shen, H., Pan, L., Li, Q., Yan, Y. and Zhang, B., 2016. P-P wave and P-S converted wave separation and de-noising combining with SVD and f-k filtering. Journal of Seismic Exploration, 25: 147-162. Wave model separation and de-noising of P-P waves and P-S converted waves is a vital task in seismic data processing. In a multi-mode seismic wave field, P-P waves have the dissimilar characteristics in comparison with other seismic signals: the energy is relatively strong, and the propagation law and coherence are more obvious to be observed (with a hyperbolic law). As for P-S converted events, they have large differences in velocity and frequency characteristics compared to other seismic wave modes. This article puts forward a P-P wave, P-S converted wave separation and de-noising workflow by combining Singular Value Decomposition (SVD) and f-k filtering. First, align P-P waves by NMO correction to make they achieve the best coherence in the transverse direction. Then, by extracting the singular values of the P-P waves through SVD, the P-P waves can be separated. Finally, by using an f-k filtering method, P-S converted waves and other noises can be separated. In this way, the complementary advantages of the SVD and the f-k filtering techniques are combined in wave field separation and de-noising, and can avoid the ineffectiveness in separation the P-P waves and P-S converted waves by only SVD or only an f-k filtering technique. Model and actual seismic data have been processed with this method, and good results have been achieved.

Keywords
Singular Value Decomposition (SVD)
f-k filtering
P-P waves
P-S converted waves
seismic wave field separation
de-noising
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Journal of Seismic Exploration, Electronic ISSN: 0963-0651 Print ISSN: 0963-0651, Published by AccScience Publishing