Robust adaptive polarization analysis method for eliminating ground roll in 3C land seismics
Chen Hai-Feng1,2,3, Li Xiang-Yang1,2,3,4, Qian Zhong-Ping2, and Zhao Gui-Ling2
1. State Key Laboratory of Petroleum Resource and Prospecting, China University of Petroleum (Beijing), Beijing 102249, China.
2. BGP Inc., CNPC, Zhuozhou, Hebei 072751, China.
3. CNPC Key Laboratory of Geophysical Prospecting, China University of Petroleum (Beijing), Beijing 102249, China.
4. Edinburgh Anisotropy Project, British Geophysical Survey, Edinburgh, U. K.
Abstract To improve the data quality of converted waves, and better identify and suppress the strong ground-roll interference in three-component (3C) seismic recordings on land, we present an adaptive polarization filtering method, which can effectively separate the ground-roll interference by combining complex polarization and instantaneous polarization analysis. The ground roll noise is characterized by elliptical plane polarization, strong energy, low apparent velocity, and low frequency. After low-pass filtering of the 3C data input within a given time-window of the ground roll, the complex covariance matrix is decomposed using the sliding time window with overlapping data and length that depends on the dominant ground-roll frequency. The ground-roll model is established using the main eigenvectors, and the ground roll is detected and identified using the instantaneous polarization area attributes and average energy constraints of the ground-roll zone. Finally, the ground roll is subtracted. The threshold of the method is stable and easy to select, and offers good ground-roll detection. The method is a robust polarization filtering method. Model calculations and actual data indicate that the method can effectively identify and attenuate ground roll while preserving the effective signals.
The research is supported by the National Natural Science Foundation of China (No. 41074080) and the Important National Science & Technology Speci?c Projects (No. 2011ZX05019-008).
About author: Chen Hai-Feng is a PhD student at the China University of Petroleum (Beijing), as well as a senior engineer in the Geophysical R&D Center, BGP, CNPC. He received his BS (2001) from the Southwest Petroleum Institute and MS (2004) from the University of Petroleum (Beijing). His research mainly focuses on multicomponent seismic exploration technology research and geophysical software development. He is a member of SEG.
Cite this article:
CHEN Hai-Feng,LI Xiang-Yang,QIAN Zhong-Ping et al. Robust adaptive polarization analysis method for eliminating ground roll in 3C land seismics[J]. APPLIED GEOPHYSICS, 2013, 10(3): 294-304.
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