【摘要】 速度分析的精度和最大炮检距处的正常时差与反射波视周期的比值有关,同时还受信噪比和静校正量的影响.深层反射正常时差较小,频率较低.信噪比也较差.速度分析难以达到希望的精度.为解决此问题,文中提出一种频率倍增方法用以提高速度分析的精度.这种方法只利用数据的信噪比高的高频成分,把它变换成形式上的高频成分.做法是将复数道分析得到的瞬时相位乘以一个整数,然后与包络合成地震道.用频率倍增后的数据进行速度分析,速度谱峰区显著变窄,噪声影响减小,静校正量的影响也有所减缓.更多还原

【Abstract】 The precision of velocity analysis relates to the ratio between NMO at the maximum offset and the dominant period of a reflection,and it is also affected by S/N ratio and statics problems. It is difficult to obtain the desirable velocity with high precision for deep reflections with small NMO correction、poor S/N ratio and lower frequency. To solve this problem,authors propose a frequency multiplication method for obtaining more accurate velocties. Only the frequency components of data with high S/N ratio are transformed into formal higher frequencies. This method can be described as follows : Instantaneous phase derived from complex trace analysis is multiplied by an integer,then combined the original envelope to obtain a new seismic trace. When the new trace after frequency multiplication is applied in velocity analysis,the peak ranges on velocity spectra become narrower and with less noise interference, the influences of statics is also weaken to certain degree.更多还原