频率域分解地震记录道中若干影响因素

FACTORS AFFECTING THE DECOMPOSITION OF SEISMIC TRACES IN FREQUENCY DOMAIN

1. 地质部石油物探研究大队;2. 同济大学

1. Research Institute of Geophysical Prospecting for Petroleum, Ministry of Geology;2. Tongji University

由地震记录道转换成虚速度测井曲线,有三个主要环节,本文针对这三个主要环节,讨论了在频率域分解地震记录道时的一些因素的影响。其中有随机噪音和时移对子波提取的影响;子波畸变、采样点和反射点位置的偏离对提取反射系数的影响,以及由此引起的采样率和分辨率问题;还有起始阻抗、密度对虚速度转换的影响。与此同时,本文还探讨了消除这些影响的方法。

There are three key-links in seismic trace converted from pseudo-velocity log. In accordance with these three key-links, the factors that exert an influence on the seismic trace docomposition in frequency domain are examined. Among them, there are the effect of random noise and time shift on wavelet extraction, the effect of wavelet distortion and the deviation of position of sampling and reflecting point on the determination of reflection coefficient, as well as the problems of the sample rate and resolution caused by them, yet, the effect of initial impedance and density on the pseudo-velocity conversion. The way of removing these effect are discussed as well.