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fei xian xing sao miao
Author(s): Harry Mayne
Pages: 321-
328
Year: 1984
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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