摘要
本文基于速度分析原理和傅里叶变换特点，假设相邻地震道来自地下同一反射界面的反射波波形基本不变，提出一种新的速度分析方法。该法首先要求沿着由t1时间和叠加速度决定的双曲延迟数据中提取向量序列，进行快速傅氏变换，将时间域数据转换到频率域然后用频率域数据实现噪声、信号的分解。其中频谱的非零频率信息可提取噪声能量，频谱的零频率信息可提取信号能量。据此，还可以估计出信噪比及速度检测因子，实现高分辨率速度分析。分析时窗不应大于所分析于波主能量的延续时间。t0时间增量不应大于半时窗长度，增量愈小，分辨率愈高。
In terms of velocity analysis principle and Fourier transform characteristic, I advance a new velocity analysis method on the assumption that adjacent-trace wave-forms from the same reflector are nearly the same. According to the method,vector sequences are derived from hyperbolic delay data depending on to times and stack ve-locities so that fast Fourier transform is made to convert the time-domain data into the frequency-domain data,by which people can separate signals from noises. Then,noise energy can be abstracted from the nonzero frequency information of the spec-trum,and signal energy from zero frequency information. What is more,both signal-noise ratio and velocity detection factor can be estimated to achieve high-resolution velocity analysis- Matters needing attention are as follows: time window is not longer than the duration during which we analyse the main energy of wavelets;to in-crement is not bigger than half time-window length,smaller increment resulting in higher resolution.
出处
《石油地球物理勘探》
EI
CSCD
北大核心
1995年第3期329-336,共8页
Oil Geophysical Prospecting
基金
国家自然科学基金会
中国科学院资助
中国石油天然气总公司资助
大庆石油管理局资助
关键词
速度分析
傅里叶变换
高分辨率
地震数据处理
velocity spectrum, velocity analysis, Fourier transform, high resolution
