基于非等权系数的综合优化叠加方法

A comprehensive weighted stack approach

受野外采集噪声和叠前预处理方法的影响,共中心点道集(CMP)和共反射点道集(CRP)内各道品质差异较大,此时传统等权叠加不能得到高信噪比结果。为此,本文提出在一定时窗或整个时窗范围内,综合CMP或CRP道集内各道地震记录的振幅、频率、炮检距以及入射角等因素衡量地震资料的品质,综合确定加权系数进行非等权优化叠加,以有效改善叠加结果。理论模型分析和实际数据处理结果表明:非等权系数的综合优化叠加方法可以更有效地去除噪声,提高资料的信噪比。

Trace quality in common middle point(CMP)gather or common reflection point(CRP)g ather are quite different due to field noise and preprocessing methods.Conventional stacking methods cannot get high signal-to-noise ratio result in this situation.We propose in this paper a new stacking method.We first analyze amplitude,frequency,offset and incidence angle of each trace in a CMP or CRP gather within a window to measure the quality of each trace,and then estimate a comprehen-sive weight for stacking.Finally we can realize a comprehensive weighted stacking.Applications of the method to synthetic and field data show that this approach is more effective in suppressing noise than conventional stacking methods.