Lithologic Reservoirs ›› 2011, Vol. 23 ›› Issue (6): 93-96.doi: 10.3969/j.issn.1673-8926.2011.06.017

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Three-parameter AVO inversion method based on modified Cauchy distribution

YUAN Huan， WANG Yuchao， SHI Lanting， HU Ziduo，YUAN Gang   

  1. Research Institute of Petroleum Exploration & Development-Northwest， PetroChina， Lanzhou 730020， China
  • Online:2011-12-20 Published:2011-12-20

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Abstract:

Three-parameter AVOwaveforminversion can be used to estimate P-wave velocity reflectivity, S-wave velocity reflectivity and density reflectivity simultaneously. But the method is often ill posed and difficult to get a high resolution result. Based on Bayesian procedure, combined with seismic deconvolution frame, a priori constrained method based on modified Cauchy distribution is proposed. This method has a strong ability of antinoise. It can improve the stability of inversion, recover the sparsity of reflectivity sequence very well, protect information of weak reflection body excellently, and offer a result with high resolution. The simulation test shows that inversion parameters are almost perfectly retrieved quickly.

Key words: coalbed methane, perspectives, ranking, comprehensive evaluation

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