摘要
利用转换波速度分析拾取的横波速度是转换波共转换点(Common Conversion Point简称CCP)叠加技术中很重要的参数.它的拾取难度在于转换波时距关系在中—浅层或大偏移距情况下误差明显增大,以及在相邻薄反射层上叠加速度谱分辨率很低.本文对选择相关速度谱分析技术进行了研究,即在速度分析中不是利用所有道集,而是有选择的利用部分(可调)道集进行速度分析,研制了相应的实用软件.理论模型和实际资料均表明,该方法在中—浅层或大偏移距情况下,比传统方法有较大改善,分辨率明显提高,能大大提高速度谱估算的精度.
The shear wave velocity determined by converted-wave velocity analysis is an important parameter for common conversion point （CCP） binning technique. The error of obtaining the velocity parameter in the non-hyperbolic time-distance relation obviously rises in the shallow-middle events or large offsets, and the resolution of velocity analysis is low between the adjacent shallow reflect layers. Based on the previous works, this paper studies the selectivecorrelation velocity analysis technique. Adopting the selected subsets of cross correlations rather than all possible ones in a gather in velocity analysis, we make out an applied software. The tests of synthetic model and processing of real data proved that our method is better than the former ones in the shallow-middle events or large offsets. The resolution of velocity analysis can also largely be improved, which increases the calculating accuracy of the velocity spectra.
出处
《地球物理学进展》
CSCD
北大核心
2006年第4期1213-1220,共8页
Progress in Geophysics
基金
国家863计划课题(2002AA615050)资助
关键词
共转换点
时距关系
分辨率
选择相关速度分析
CCP, time-distance relation, resolution of velocity analysis, selective-correlation velocity analysis
