【摘要】 本文提出一种角度部分叠加资料同时反演纵波和横波速度的方法.以角度部分叠加资料为基础,利用地震波振幅随入射角变化与弹性参数间的数学关系,基于非线性最优化理论,通过将最小平方问题转化为大型带状矩阵的求解问题,采用逐道外推技术依次求得该角度剖面的每个点纵波和横波速度值,利用地震波速度在各向异性介质中与入射角的关系,进一步得到地震波零入射角纵、横波速度,从而可以求得纵横波速度比及泊松比,为地震资料的岩性及含油气性解释提供了丰富的参数信息.为保证反演的稳定性,降低多解性,采用测井、叠后构造层位解释结果的共同约束,并做好叠前去噪以及振幅保持处理.更多还原

【Abstract】 This work proposes a method to inverse P and S wave velocity simultaneously using partially stacked angle data.This method is based on partially stacked angle data and the relationship between the variations of seismic wave amplitudes with incidence angles and the elastic parameters.According to the non-linear optimization theory,the least square problem is converted into the solution issue of large-sized band-shape matrix.Using the extrapolation gather by gather,the values of P and S wave velocities at each point on the angle profile are calculated sequentially.Then,in terms of the relationship between seismic wave velocities and incidence angles in anisotropic media,the P and S wave velocities for the case of vertical incidence are determined.Further more,ratios of P and S wave velocities and Poisson’s ratio are obtained which provide abundant parameter information for lithologic and hydrocarbon-bearing interpretations of seismic data.To ensure stability of inversion and reduction of multi-solution possibility,this method employs the joint constraints of well logging and poststack structural layer interpretations,and makes prestack noise elimination and amplitude preservation as much as possible.更多还原