摘要
广义S变换能根据实际地震信号的频率分布特点和时频分析的侧重点灵活地调节窗函数随频率的变化趋势,加快或减慢窗时宽随频率的变化速度,使窗函数的振幅呈现多种非线性变化特征,更好地适应具体信号的分析和处理。在广义S变换实现时引入窗函数库、弦函数库、快速傅里叶反变换,使运算简洁、易行、高效,通过选取合适的参数组合,对得到的时频谱进行能量重新分配、重构,得到高分辨率地震信号。理论模型和实际资料处理结果表明,该方法能够有效增强地震信号时域和频域的分辨率,使地震剖面的构造特征和岩性特征更为清晰。
Generalized S transform(GST)can flexibly adjust the change trend of the fundamental window function according to the frequency distribution characteristics and the time-frequency emphasis of seismic data.This transform can also quicken orslow the time-bandwidth change along with the frequency to make the amplitude of the fundamental window function present various nonlinear changes.This will be very helpful for adapting to signal analysis and processing.We introduce window function database,sin(cosin)function database and IFFT in the GST method,the calculation of which is simple,convenient and effective.Then we redistribute the energy of the time-frequency spectrum,and reconstruct signals to obtain the high-resolution seismic data.Test results on model and real seismic data indicate that this method can availably improve seismic signal resolution both in time and frequency domain,and make structural and the lithologic characteristics on seismic sections much clearer.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
2014年第1期82-88,302,共7页
Oil Geophysical Prospecting
基金
国家重大专项(2011ZX05006-006)
(2011ZX05009)
国家"973"项目(2011CB201104)联合资助
关键词
时频分析
广义S变换
高分辨率处理
time-frequency analysis,generalized S transform(GST),high resolution processing
