海上拖缆三维地震数据规则化技术研究

The Regularization of 3D Seismic Data from Marine Towed Streamer

电缆的羽状漂移导致海上三维拖缆地震资料采集出现偏移距、方位角及覆盖次数的不规则现象,常规面元均化技术难以实现CMP道集内数据的规则性。在分析海上地震数据不规则性特点的基础上,将反漏频傅里叶变换(ALFT)数据规则化技术应用于LD地区WZ油田的CMP道集内数据的规则化处理,基于规则化海上地震数据的叠前偏移成像效果,评价该方法的有效性。结果表明,地震数据规则化技术可以有效地提高数据的信噪比,改善同相轴的连续性,明显提高成像质量。

Irregularities occur in azimuth and fold due to streamer feathering while conducting marine seismic acquisition.To remedy this,the traditional approach to do bin equalization but it is difficult to realize the regular of data in CMP gathers.The technology of antileakage Fourier transform（ALFT）for data regularization is applied to regularize the data in CMP gathers at LD area in WZ oilfield based on the analysis of the characteristics of irregularity for marine seismic data.The availability of the ALFT is evaluated based on the effect of pre-stack migration for marine seismic data regularized.The results in this paper show that the regularization significantly raises the ratio of S/N,improves the reflection events continuity and enhances the overall quality of seismic data.