基于相位扫描的地震子波提取方法研究

SEISM WAVELET EXTRACTION BASEd ON PHASE SCAN

以常相位假设为基础,通过计算随信号相位发生变化的目标函数值来对地震记录进行相位扫描,以寻求最能逼近子波真实形态的常相位值,并应用此相位及地震记录的振幅谱合成地震子波,达到地震子波提取的目的。在以往通用目标函数的基础上,增加了对信号相位特征反映更为敏感的绝对峰度准则目标函数,并在统计平均意义下,采用多目标联合扫描的方式求取信号相位,使其更能准确、真实地反映子波的相位特征,同时也能提高抗干扰能力。模拟试验证实了该方法的可行性和有效性,进一步通过对实际资料的子波估计以及应用估计的子波进行反褶积处理的结果论证了该方法的实用价值。

Take consistent phase supposition as foundation, changes the object function value is changed through computing the signal phase to scann the phase of seismic record, the approach to the wavelet real shape constistent phase value sought, and the phase and the recorded amplitude spectrum synthesis seismic wavelet used, wavelet extraction realized. On the basis of common object function, new object function which more sensitive to the signal phase characteristic is added. And the way that multi-objective union scanning is applied to seek for statistical average , make wavelet phase characteristic more accurately and really, improve anti-interference ability at the same time.The practical value of method has been proved by estimating wavelet from practical data and deconvolution.