共反射面元叠加技术在LB三维的应用

Application of common-reflection-surface stacking method in LB3D

LB三维深层资料低信噪比问题一直以来都是常规处理方法难以解决的一个难点。而共反射面元叠加是一种有效提高信噪比的全新叠加技术,其成像方法与宏观速度模型无关,仅依赖近地表速度,通过搜索适应各种反射界面的局部形态的共反射面时距关系响应,使得反射界面上在菲涅尔带内的反射信息能够得到同相叠加。从LB三维实际应用效果来看,共反射面元叠加的深层反射信号连续性得到加强,随机噪音明显得到压制,信噪比有明显提高。

Low S/N of deep-seated reflection is a problem difficult to solve by general processing method in LB 3D. Common-reflection-surface（CRS）stacking is a new stacking method to enhance S/N of seismic data. The imaging method has nothing to do with macro velocity model, but velocity near surface. By searching every response of time-offset relation on common reflection surface suitable for all kinds of local shape of reflection surface,the technique can make all the reflection information in Fresnel Zone stacked with the same phase. Being applied in LB area,the common-reflectiowsurface stacking makes the deep-seated reflection information enhanced. Meanwhile, random noise is suppressed , and S/N is raised greatly.