摘要
本文从理论上对波阻抗反演的随机逆解法进行了分析推导，认为随机逆解法是一种阻尼最小二乘法，且因阻尼项λ=σ2n／σ2m有其本身的物理意义，决定了它又不是普通意义下的阻尼最小二乘法。通过对该阻尼项采用自适应算法，解决了波阻抗反演中对解空间的定量约束问题；并用模型参数方差对反演结果进行约束，使宽带约束反演的解限制在合理的地球物理参数范围之内。文中给出了利用多口井进行约束反演的实例，特别对波阻抗反演的约束条件进行了研究。
The theoretical analysis of random inverse method for wave impedance inver-sion leads to the conclusion that random inverse method is one damping least squaremethod, which, however, is not general damping least square method becausedamping item λ=σ2n/σ2m has its own physical meaning. Applying adaptive algorithmto this damping item achieves nicely quantitative restriction for solving space inwave impedance inversion. Model parameter variance restricts inversion result tomake widely-restricted inversion solution range in the reasonable interval of geo-physical parameters. The real inversion example using multihole restriction is giv-en, and the restriction condition for wave impedance inversion is analysed particu-larly.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1998年第2期151-160,共10页
Oil Geophysical Prospecting
关键词
宽带约束反演
随机逆
算法
地震勘探
波阻抗
wide-band restriction inversion, random inverse method, restriction condition, adaptive algorithm
