低信噪比地震资料处理中的精细速度分析方法

为了提高低信噪比资料速度分析的精度，得到中深层可靠的速度信息。针对关中地区深部隐伏断裂构造调查的地质目标，在二维地震勘探的基础上，对低信噪比地震资料采用"优选道集速度分析、动校正、F-K滤波、反动校正、高密度精细速度分析"的技术流程，使得速度谱中能量团聚集，不仅提高了低信噪比地震资料速度分析的精度，而且达到了提高信噪比的效果，进而获得了较高品质的中深层速度场信息与成像剖面资料。 

The method of fine velocity analysis on low SNR seismic data processing

In order to improve the velocity analysis precision of the low SNR seismic data and to get reliably velocity information, on the basis of 2D seismic prospecting, the technical process of "preferred gathers velocity analysis, NMO correction, F-K filtering, InvNMO correction, high density fine velocity analysis" was used to investigate the geological targets of deep concealed faulted structures in Guanzhong area for seismic data with low signal-to-noise ratio, which makes the velocity spectrum energy group gathered. It can not only effectively improve the precision of velocity analysis of seismic data with low signal-to-noise ratio, but also suppress the noise. And then the medium and deep velocity field information with high quality and imaging profile data were got.