摘要
基于襟怀褶积模型的地震道反演中，由于存在波阻抗与反射系数的速推关系式，所以反演结果必定受到波阻抗逆推公式的影响，特别是要受到第一个波阻抗值即初值的影响。初位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，产生地震解释的陷附。本文用带限反演、稀疏脉冲反演和宽带约束庆演方法模型试算，阐明了初值偏差的影响，并提出了实际反演中，选准初值以降低初估偏差影响的实用方法。
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.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1999年第3期332-340,共9页
Oil Geophysical Prospecting
关键词
波阻抗
初值
多解性
地震道反演
地震勘探
wave impedance, initial value, low frequency component,marked bed, standardization, multisolution
