波阻抗初值选择与地震道反演的多解性

基于褶积模型的地震道反演中，由于存在波阻抗与反射系数的递推关系式，所以反演结果必定受到波阻抗递推公式的影响，特别是要受到第一个波阻抗值即初值的影响。初值选择不同会出现反演的多解性；初值选择不当，会导致低频分量，相对波阻抗及岩层厚度的错误，产生地震解释的陷阱。

Choice of initial wave impedance value and the multisolution of seismic trace inversion

Because of the recursion relation between wave impedance and reflection coefficient in seismic trace inversion based on convolution model, the inversionresult must be influenced by wave impedance recursion formula, particularly,the initial value of wave impedance. Different initial wave impedance values bring multisolution of inversion. Improper initial value will result in errors of low frequency component, relative wave impedance and stratum thickness to cause pitfalls of seismic data interpretation. Certain influence due to initial de-viation is proved by some modeling computations of band-limited inversion,sparse pulse inversion and wide-band restrictive inversion. This article de-scribes a practical method for choosing correct initial value to reduce the influ-ence resulting from initial value deviation.