改进纵波与转换波时间匹配方法研究

An improved method for P-P and P-SV wave time matching

针对多波地震资料纵、横波匹配方法产生的转换波地震子波的畸变问题,本文提出了一种改进纵波与转换波资料时间匹配的方法。该方法依据傅里叶展式的时标变换定理,对时间匹配后的转换波资料的地震子波进行振幅和相位同时匹配,解决纵波与转换波时间匹配域转换中的转换波地震子波波形畸变问题。文中对实际测井资料合成地震记录进行了研究,结果表明该方法能够对转换波资料进行振幅和相位的同时匹配。含噪声合成数据实验研究结果表明,本文方法也能够改进转换波的时间匹配结果。

As the velocity ratio is changing with time,the time matching from P-SV to PP time domain will distort seismic wavelet which includes waveform stretch and phase delay.To solve this problem,we propose an improved method for P-P and P-SV wave time matching.This method,based on Fourier's time stretch theory,can correct simultaneously wavelet amplitude and phase resulted from the different stretch value with the seismic travel time.The modeling data results of a well log data indicate that the method can correct simultaneously wavelet amplitude and phase.And the method is still stable when the data is noised.