电磁驱动可控震源激发信号估计方法研究

电磁驱动可控震源应用中,常规方法采用基板附近信号估计激发信号。研究发现,复杂地质条件下,该方法估计结果误差较大。因此,提出利用直达波与其他地震波到时不一致的特征,通过匹配滤波技术从震源基板附近信号中提取直达波来估计震源激发信号的新方法。数值模拟研究表明,方法估计的激发信号与理想激发信号相关系数为0.957 4,达到高度线性相关,说明方法适用于复杂地质条件下电磁驱动可控震源激发信号的高精度估计。

Study on the Estimation Method of Excitation Signal in Electromagnetic Seismic Vibrator

The conventional method using the signal near base-plate to estimate the excitation signal of electromagnetic seismic vibrator. The study finds that when the geological structure is complex, the estimation result using conventional method has error. So the paper proposes a new method that according to the different arrival time among direct wave and other seismic waves,extracting the direct wave from the signal near base-plate by matched filter technology to estimate the excitation signal. Research on simulation data demonstrates that, the correlation coefficient between the estimation excitation signal and ideal excitation signal is 0.9574, up to highly linear correlation. The method can be used for high precision estimation of excitation signal in electromagnetic seismic vibrator when the geological structure is complex.