Effect of inaccurate wavelet phase on prestack waveform inversion

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• 作者：Chun-Mei Luo (1) (2)
  Shang-Xu Wang (1) (2)
  San-Yi Yuan (1) (2)
  
  1. State Key Laboratory of Petroleum Resources and Prospecting ; China University of Petroleum ; Beijing ; 102249 ; China
  2. CNPC Key Laboratory of Geophysical Exploration ; China University of Petroleum ; Beijing ; 102249 ; China
  
• 关键词：wavelet ; phase ; prestack inversion
• 刊名：Applied Geophysics
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：11
• 期：4
• 页码：479-488
• 全文大小：2,964 KB
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• 刊物主题：Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Springer Berlin Heidelberg
• ISSN：1993-0658

文摘

Wavelets are critical to inversion methods. Incorrect phase estimation will affect the objective function and cause convergence to local minima, and thus produce biased or incorrect results. Based on two simple models and ignoring all other factors, we studied the variation of the wavelet phase as a function of frequency and its effect on the prestack waveform inversion. Numerical experiments show that an incorrect phase may result in large deviations from the real solution, even if there is a high similarity between the model and real wavelets. The precision of the inversion slightly improves by using the constant-phase rotation; however, the effect of phase inaccuracy is not eliminated, which limits the precision of prestack inversion.