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fei xian xing sao miao
Author(s): 
Pages: 321-328
Year: Issue:  4
Journal: Oil Geophysical Prospecting

Keyword:  非线性扫描高频成分地层衰减石油地球物理勘探分贝可控震源瞬时频率时间函数频谱分析扫描信号;
Abstract: All the conventional vibrators use the sweep signal of which the instantaneous frequency shows linear change with time.If a proper non- linear change of the instantaneous frequency is realized,we can get a frequency spectrum whose input is the mean of the reciprocals of bed attenuation coefficients.The time function of the frequency speetrum is a logarithmic sweep signal,whose amplitudes in 10—100Hz band may be increased by 20 db.This sweep signal has desired advantages:more high frequency content,less harmonic and low frequency contents,and hi- gher formation resolution.
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