摘要
常规地震勘探采集中,观测系统设计是基于共中心点(CMP)理论进行的,传统的地震采集设计方法已不能完全满足日趋复杂的勘探状况。从近年来广泛讨论的地震照明技术出发,提出了针对目的层、基于射线追踪正演的观测系统属性分析方法,并给出了楔状模型和曲界面模型数值模拟实例,得到了基于目的层CRP点的面元信息——面元随偏移距变化的覆盖次数和能量(振幅)分布。通过定量分析得出结论,在上覆界面非水平情况下,其下伏地层覆盖次数及下传能量受很大影响。
The conventional method of seismic data acquisition geometry design is based on the assumption of horizontal subsurface reflectors,which often is not suitable for complex structures. This article presents the method of analyzing geometry property aimed at target based on ray tracing forward modeling. By computing 2 velocity models,we get the result of CRP bin information which contain fold and energy distribution while the offset changes. We concluded that the fold and downward energy under non-horizontal surface is badly affected by overlying strata.
出处
《勘探地球物理进展》
2010年第2期87-92,共6页
Progress in Exploration Geophysics
关键词
观测系统
地震照明
射线追踪
CRP
acquisition geometry
seismic illumination
ray tracing
CRP
