三维三分量地震资料联合反演方法应用研究

3D3C seismic joint inversion applications

文中基于三维三分量地震资料联合反演的基本原理,通过测井资料分析、交会图分析、初始模型的建立,利用纵波、转换波联合反演得到了纵波阻抗、横波阻抗、纵横波速度比、泊松比、λρ、μρ等属性体(λ、μ为拉梅系数,ρ为密度)。其中纵横波速度比属性对于反映气层分布较为准确,并显示低异常;λρ属性对反映油层分布较为准确,并表现为低λρ值。实际资料处理结果表明,利用纵波、转换波联合反演得到的储层预测结果与井资料符合率达80%,因此这些属性可作为储层分布范围划分的重要依据。

In this paper,some attributes,including P-and S-wave impedances,P-and S-wave velocity ratio,Poisson's ratio,λρ and μρ,have been calculated using 3D3C seismic joint inversion with well logging data,cross-plot analysis and an initial model.The P-and S-wave velocity ratio is sensitive to gas reservoir distribution,and λρ is sensitive to oil reservoir distribution.Our application results show that reservoir prediction based on P and PS wave joint inversion has 80% coincidence with the drilled well data.So these attributes obtained by the joint inversion can be used in reservoir distribution prediction.