Invited Papers from the 12th International Conference on Theoretical and Computational Acoustics (ICTCA 2015); Guest Editor: Yuefeng SunNo Access

Time Frequency Wavenumber Analysis of Surface Waves and Signal Enhancement Using S-Transform

Zhao Zhang

Geology and Geophysics Department, Texas A&M University, College Station, Texas 77840, USA

E-mail Address: zhao.zhang2008@gmail.com

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Yuefeng Sun

Geology and Geophysics Department, Texas A&M University, College Station, Texas 77840, USA

E-mail Address: sun@geos.tamu.edu

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, and

Karl Berteussen

The Petroleum Institute, P. O. Box 2533, Abu Dhabi, United Arab Emirates

E-mail Address: kberteussen@pi.ac.ae

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https://doi.org/10.1142/S0218396X1540010XCited by:0 (Source: Crossref)

Abstract

Highly dispersive surface waves resulting from the combination of strong lateral seafloor heterogeneities, shallow water depths and hard sea bottom severely degrade seismic reflection data quality. Considering that seismic signals are nonstationary and surface waves have various spectra over time, we proposed S-transform-based time frequency wavenumber analysis technique which allows the dynamic analysis of spectrum over time. The data is first transformed from the time-space domain to the time-wavenumber domain through one-dimensional Fourier transform over the spatial variable, then the variable-factor S-transform is applied over time. Nonstationary filtering is then designed to identify and separate surface waves in complex wavefields, based on its low frequency and low velocity properties, in the time-frequency-wavenumber (TFK) domain. Application to field data illustrates that with this technique, not only is the surface wave effectively suppressed, but also the reflective signals are enhanced, which confirm the validity of the method.

Abstract of the first part of the paper was presented at the 73rd Annual Meeting of the Society of Exploration Geophysics, Denver, USA in September 2010. The second part was presented at the 75th Annual Meeting of the Society of Exploration Geophysics, Las Vegas, USA in November 2012.

Keywords:

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