Ground-roll separation of seismic data based on morphological component analysis in two-dimensional domain

• Published in: Applied geophysics Vol. 13; no. 1; pp. 116 - 126
• Main Authors: Xu, Xiao-Hong, Qu, Guang-Zhong, Zhang, Yang, Bi, Yun-Yun, Wang, Jin-Ju
• Format: Journal Article
• Language: English
• Published: Beijing Chinese Geophysical Society 01.03.2016; Springer Nature B.V; School of Computer and Information, Hefei University of Technology, Hefei Anhui 230009, China%School of Mathematics, Hefei University of Technology, Hefei Anhui 230009, China
• Subjects: Algorithms; Dictionaries; Earth and Environmental Science; Earth Sciences; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; Rayleigh waves; Reflected waves; Representations; Seismic studies; Seismic waves; Seismology; Signal processing; Two dimensional; Ground-roll suppression; two-dimensional local discrete cosine transform; morphological component analysis; sparse representation; two-dimensional undecimated discrete wavelet transform
• ISSN: 1672-7975; 1993-0658
• DOI: 10.1007/s11770-016-0546-0

Ground roll is an interference wave that severely degrades the signal-to-noise ratio of seismic data and affects its subsequent processing and interpretation. In this study, according to differences in morphological characteristics between ground roll and reflected waves, we use morphological component analysis based on two-dimensional dictionaries to separate ground roll and reflected waves. Because ground roll is characterized by low-frequency, low-velocity, and dispersion, we select two-dimensional undecimated discrete wavelet transform as a sparse representation dictionary of ground roll. Because of a strong local correlation of the reflected wave, we select two-dimensional local discrete cosine transform as the sparse representation dictionary of reflected waves. A sparse representation model of seismic data is constructed based on a two-dimensional joint dictionary then a block coordinate relaxation algorithm is used to solve the model and decompose seismic record into reflected wave part and ground roll part.The good effects for the synthetic seismic data and application of real seismic data indicate that when using the model, strong-energy ground roll is considerably suppressed and the waveform of the reflected wave is effectively protected.