窗口分数维的初至波自动拾取

Automatic Picking Preliminary Wave Based on Fractal Dimension

地震初至波的拾取技术对石油、矿物资源的开发有着重要作用,目前的拾取方法大都以振幅、频率、相位作为初至波的判断依据。通过对分形理论的研究,结合滑动窗口原理,提出了一种新型的初至波自动拾取方法,该方法把分数维这一概念引入到地震初至波拾取中,通过每个窗口内的曲线变化来反映局部数据的特征——分数维,再依据总体数据特征的变化趋势情况来判断初至波,并确定其到达时刻。实验结果证明该方法优于传统拾取方法,其运算速度快,抗干扰能力强。

Preliminary wave picking technology plays an important role in the development of oil and mineral resources, the current methods of picking technology mostly in the amplitude and frequency and phase are taken as the major judgment for preliminary wave.Through the principles studying of fractal theory,a new kind of primary wave automatic picking method is proposed by sliding window,and the concept of the fractal dimension is introduced into this method to the preliminary wave picking,by each window reflecting the characteristics of the datafractal dimension,and then according to fractal dimension changing of picking primary wave, the arrival time of primary wave is determined. Experimental results show that the proposed method is superior to traditional picking methods,which has good operation speed, strong interference capability.