强工频干扰波的提取与消除方法

Extraction and removal of strong power interference

Faculty of Resource and Information, University of Petroleum, Beijing 102200, China

针对强工频干扰问题, 提出了在时间域内提取单频干扰的共轭梯度方法。采用串联方法消除工频干扰及其谐波, 即逐个提取单频干扰波, 然后从地震记录中减去该单频干扰波, 最终达到消除工业电干扰的目的。理论记录试算和实际资料处理结果表明, 即使是对于常规滤波方法难以消除的极强的工频干扰, 该方法仍然获得了较好的效果。在工频干扰较强的情况下, 陷波滤波方法将导致信号起跳时刻模糊, 而本方法则不存在这样的问题。

A new method is advanced to extract and remove strong power interference. This method adopts conjugate gradient method to recover single-frequency interference, and removes power interference in series, that is, each single-frequency interference is extracted firstly, then, is subtracted from the seismic record. Theoretical and real data results prove the feasibility of the method in suppression of strong power interference which is hard to be suppressed by conventional filtering methods. For not very strong power interference, filtering method will cause first break to be blurry, whereas this method can work perfectly. This method is applicable to extraction and removal of any frequency interference.