叠前ω-x域算子外推法去噪

Prestack noise reduction using (ω-x)-domain operator extrapolation

为了改善低信噪比地震资料的处理效果，本文提出了一种叠前去噪的新方法。该法是利用地震记录上信噪比相对比较高的中频段通过外推求得低频段或高频段ω－x域的预测算子，也就是说，利用中频段ω－x域的算子在频率轴方向上向前一步预测求得低频段的预测算子，反之，向后一步预测求得高频段的预测算子。经理论记录和实际地震记录检验，表明经ω－x域算子外推后的去噪效果有显著改进。

A new method for prestack noise reduction is developed to improve the processing effect of the seismic data whose signal/noise ratio is low. In this method,the (ω-x)-domain prediction operator for low frequency band (or high frequency band)is estimated by extrapolating the noise reduction operator of the mid frequency band whose signal/noise ratio is relative high. In other words,we use (ω-x)-domain operator of mid frequency band to obtain the prediction operator for low frequency band through forward prediction along frequency axis,and to estimate the prediction operator for high frequency band through backward prediction. Theoretical and real data results prove that (ω-x)-domain operator extrapolation brings obviously-improved noise reduction.