VTI介质多波各向异性参数分析

Anisotropic parameter analysis of multi-component data in VTI media

在地震数据处理中,通过各向同性参数分析无法校平大炮检距地震记录,会引起动校拉伸、叠加结果失真,而通过各向异性参数分析,能实现对大炮检距地震反射资料的有效处理。本文针对VTI介质中PP波和PSV波各向异性参数分析过程,提出充分利用多波数据信息丰富的优势,采用预估—分析—提取的策略限定各向异性参数的范围,简化各向异性参数分析的流程,达到提高多波各向异性参数提取精度和分析效率的目的;并通过优化参数谱,增强各向异性参数谱的分辨率。通过理论模型和实际资料验证了方法的正确性和可行性。

Using isotropic parameter analysis to correct seismic gathers with long-offset data can result in normal moveout stretching and stack distortion.But anisotropic parameter analysis can effectively process reflections of gathers with long-offset.In this article,we illustrate anisotropic parameter analysis of PP data and PSV data.In anisotropic parameter analysis of PSV data,we take an estimation-analysis-pickup flow to limit the range of value of anisotropic parameters,and simplify the procedure of anisotropic parameter analysis by making full use of multi-component seismic records,which improves accuracy and efficiency of anisotropic parameter analysis.By optimized calculation of anisotropic parameter spectrum,the spectrum resolution can be improved.Tests on model and real datasets prove the validity and feasibility of the proposed method.