一种自动剔除地震记录噪音的新方法

A NEW METHOD OF COMPUTER-BASED NOISE REJECTION ON SEISMIC TRACE

大港油田物探公司

Geophysical Prospecting Corporation,Dagang Oilfield

本文提出了一种在解编后的炮序记录上自动剔除噪音的新方法。剔除的噪音包括以下三种:高频震荡、单频谐振和异常大振幅。对噪音的处理分为局部压缩,局部清零和整道清零。为了更好地判断异常数据,本方法先对地震记录做道均衡和几何发散补偿处理,然后在一人工给定的时窗内求一炮数据的标准平均振幅,然后依据这个标准平均振幅和八个任意给定的门槛值对数据进行检测。值得提出的是,本方法是在原始数据上对各种检测到的异常振幅作局部处理,故本方法属振幅保持处理。另外,本方法设置的尾部范围和采取的保留面波的作法在生产实践中取得了较好的效果。

The paper presents readers a new method which can get rid of the noises appeared on the trace demultiplexed. The noise to be rejected include high frequency oscillation,simple harmonics and unusually high amplitude (skip). The handling procedures taken for removing the noises involve local compression, local muting and global muting. For ensuring the success in determining the undesired data,advisably to perform in the first place the EQUALIZATION and GEOMETRIC DIVERGENCE COMPENSATION and then to calculate the standard average amplitude of single shot data within the given window. After that,to detect data based on the calculated standard average amplitude and 8 arbitrarily-given thresholds. It's worth noticing that the approach being recommended here is to do the local processing for all kinds of the delected abnormal amplitudes on original record,so it should be claimed as"Preserved Amplitude Processing"as a matter of course. Also,the 2 measures,to set up"End Region"and let the surface waves stay there,which are taken in the .method presented in this paper have yielded an appreciable result in operation.