微地震信号的变速FK滤波-自适应极化滤波方法

The seismic signal technology with variable velocity FK filtering-the auto-adapted polarization filtering

针对微地震信号的特点,研究了变速FK滤波-自适应极化滤波方法.在设计FK滤波因子时,通过计算相邻道滑动时窗内信号的互相关系数,确定时窗内信号的视速度范围,实现变速FK滤波;对时窗内的信号进行二维FFT变换时,分别在时窗的纵横向上补零充位,消除信号在二维变换时造成的时空域的混跌和泄漏;在设计自适应极化滤波因子时,针对复杂波场中波的偏振方向的不确定性问题,本文通过计算相部道信号偏振投影的最大互相关系数,确定波的跟踪分量;把波的跟踪分量作为极化滤波因子里的期望方向,改进常规滤波因子,实现自适应极化滤波.对理论模型和实际资料的处理结果表明,该方法理论正确,实际资料的处理效果也得到了明显的改善.

In view of the characteristic micro-seismic FK filtering-the auto-adapted polarization filtering signal, this article has designed the method of variable velocity When we design the FK filter factor, we determine the signal speed range in each aperture through computation of the signal mutual correlation coefficient at glide aperture in the adjacent channel. In order to remove the alias and divulging which is created by the two-dimensional fft transformation when we make the two-dimensional fft transformation to the window, we make the zero sufficient position in vertical and horizontal direction in the time window. In view of question which complex wave field wave expectation direction is indefinite when we design the auto-adapted polarization filtering factor, we compute adjacent channel polarization projection mutual correlation coefficient to confirm wave track component and then choose expectation direction in the convention polarization filtering factor for the track component direction. And then we realize the auto-adapted polarization filtering. The effect has the distinct improvement when this method is used to process the theoretical model and actual material.