基于射线理论面向层状介质的三维观测系统聚焦束分辨率计算  

Double-focus resolution algorithm of 3D seismic acquisition geometry based on ray theory in layer models

作　　者：杨萌萌[1] 刘学伟[1] 谢城亮[1] 刘继红[1] 杜百灵[1] 

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《石油地球物理勘探》2011年第5期669-674,836+659,共6页Oil Geophysical Prospecting

基　　金：国家重点基础研究发展计划项目(2009CB219505);国际科技合作计划项目(2010DFA21630)的资助

摘　　要：本文用射线理论简化了观测系统双聚焦束分辨率的计算,即首先根据射线理论求得由目标点激发的地表响应——CFP道集,再将CFP道集向下延拓聚焦到目标层,得到聚焦束。观测系统中检波点和震源分布密集时成像效果更好。当存在较大倾角构造时,成像点周围的能量团会向构造倾向偏离,且在观测系统(检波点和震源点分布)稀疏时更明显。理论和实际模型试算结果均表明,该方法计算速度较快、效率较高,且符合精度要求。This paper simplifies the double-focus resolution algorithm based on seismic ray theory.First,the response of the target point at the surface is calculated according to seismic ray theory,which is called CFP gather.Then the CFP gather is focused to the target layer by downward extrapolating,getting the focus beams.The image resolution gets better with the higher density of geophone and source distribution.If there is a high dip angle structure,the energy around the target point would move toward the structure trend,obviously when the geophone and source distributes sparsely.This method is proved to be effective and accurate and meet the precision requirement through theory and actual model tests.

关 键 词：聚焦束 三维地震观测系统 射线理论 分辨率 双聚焦 

分 类 号：P631[天文地球—地质矿产勘探]