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Ground roll attenuation using a time-frequency dependent polarization filter based on the S transform |
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| Authors: | Tan Yu-Yang He Chuan Wang Yan-Dong Zhao Zhong |
| Institution: | 1. Institute of Oil & Gas, School of Earth and Space Sciences, Peking University, Beijing 100871, China 2. School of Geosciences, China University of Petroleum(East China), Qingdao 266555, China 3. Geophysical Corporation, Shengli Branch, SINOPEC, Dongying 257086, China |
| Abstract: | The ground roll and body wave usually show significant differences in arrival time, frequency content, and polarization characteristics, and conventional polarization filters that operate in either the time or frequency domain cannot consider all these elements. Therefore, we have developed a time-frequency dependent polarization filter based on the S transform to attenuate the ground roll in seismic records. Our approach adopts the complex coefficients of the S transform of the multi-component seismic data to estimate the local polarization attributes and utilizes the estimated attributes to construct the filter function. In this study, we select the S transform to design this polarization filter because its scalable window length can ensure the same number of cycles of a Fourier sinusoid, thereby rendering more precise estimation of local polarization attributes. The results of applying our approach in synthetic and real data examples demonstrate that the proposed polarization filter can effectively attenuate the ground roll and successfully preserve the body wave. |
| Keywords: | Ground roll S transform spectral matrix polarization attributes polarization filter |
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