一种基于修正Cauchy分布的高分辨率AVO三参数反演方法  

Three-parameter AVO inversion method based on modified Cauchy distribution

作　　者：袁焕[1] 王宇超[1] 石兰亭[1] 胡自多[1] 袁刚[1] 

机构地区：[1]中国石油勘探开发研究院西北分院

出　　处：《岩性油气藏》2011年第6期93-96,共4页Lithologic Reservoirs

基　　金：国家"973"项目"非均质储层预测"(编号:2007CB209604)资助

摘　　要：AVO三参数波形反演可以同时获取纵、横波反射率和密度反射率3个参数。但AVO三参数反演问题通常是"病态"的,而且不易得到高分辨率的反演结果。该文基于贝叶斯反演理论,结合反褶积数学框架,提出了一种改进的基于修正Cauchy分布的先验约束方法。从数值模拟的结果看,该方法不仅提高了反演的稳定性,很好地恢复了反射率序列的稀疏性,而且较好地保护了弱反射体信息,能够快速得到较可靠的高分辨率反演结果。Three-parameter AVO waveform inversion 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.

关 键 词：AVO三参数 波形反演 修正Cauchy分布 高分辨率 

分 类 号：P631.4[天文地球—地质矿产勘探]