速度横向变化对地震成像的影响  

Influence of lateral velocity variation on seismic imaging

作　　者：王卫华 

机构地区：[1]河北省涿州市东方地球物理公司,072751

出　　处：《石油地球物理勘探》2007年第6期720-726,共7页Oil Geophysical Prospecting

摘　　要：纵波反射波法多次覆盖技术基于水平层状均匀介质的假设条件与实际情况相差太大,是影响山地资料地震成像效果并造成勘探失利的主要原因。本文针对山地资料地震成像出现的问题,通过简单模型计算,分析了速度横向变化对地震成像的影响,主要表现为CMP和CRP点两边相应射线路径不对称或CRP点的发散。文中对在复杂山地用超长地震排列观测和选排列段叠加的做法提出质疑,并提出了在现有技术条件下复杂山地山前带地震采集和处理工作中需要注意的问题。Big difference between the hypothetic condition of horizontal layered uniform medium that the P-wave reflections multiple coverage method based on and practical situation is main reason affecting the imaging of mountainous seismic data and resulting in failure of exploration.In view of the issues appearing in imaging of mountainous seismic data,the paper analyzed the influence of lateral velocity variation on seismic imaging by simple model computation,which is shown as non-symmetric relevant ray paths on both sides of CMP and CRP or dispersion of CRPs.The paper questioned on practice using ultra-long seismic spread for surveying and selecting spread segment for stack in complex mountains and presented the issues needing attention in seismic acquisition and processing works in complex mountainous foreland area under current technical conditions.

关 键 词：山地地震勘探 速度横向变化 地震成像 排列长度 选排列段叠加 

分 类 号：P631.443[天文地球—地质矿产勘探]