可控震源零相位转换问题探讨

A tentative discussion on zero phase transformation of vibroseis data

当前对于可控震源零相位资料小相位转换存在较大争议,是否为必需流程?何时进行转换?转换后对地震子波的影响如何?本文通过对可控震源的扫描信号自相关子波、模拟大地吸收后可控震源的子波和实际可控震源采集数据做小相位转换处理分析,发现相位转换过程中的相位漂移现象不可避免,并明确给出修改方法,一定程度上解决了相位漂移的问题;文章肯定了相位转换的必要性,同时给出处理次序。

The transformation of zero phase into small phase in vibroseis seismic data processing is a problem of controversy： Is it a necessary process？ when will is be conducted ？ What is its influence on seismic wavelet？ The authors analyzed small phase transformations of the autocorrelation wavelet sweep signal of vibroseis,the simulated earth absorbed wavelet and the practical vibroseis data wavelet. The authors have found that phase drift phenomenon is inevitable in the phase transformation process,and propose the modification method,which can to some extent solve the problem of the phase-shift. The authors affirmed the necessity of phase transformation,and put forward the optimal order to conduct the processing.