三维观测系统对叠前成像效果的影响分析  

Analysis of 3D geometry’s influence to pre-stack imaging effects

作　　者：秦广胜[1,2] 

机构地区：[1]中国石化中原油田物探研究院,河南濮阳457001 [2]中国地质大学,北京100083

出　　处：《石油地球物理勘探》2010年第A01期6-8,共3页Oil Geophysical Prospecting

摘　　要：当炮点和检波点采样不足时,叠前偏移会导致严重的偏移噪声,从而制约叠前偏移的成像精度。本文应用散射点叠前偏移响应和射线追踪模型技术分析了观测系统类型、排列片宽度和线束滚动距离等对叠前偏移成像效果的影响。分析结果表明,与斜交和砖墙式相比,正交观测系统更有利于获得好的成像;在空间采样密度和线束滚动距离一定的情况下,较宽的排列片有利于减小偏移噪声;在采样密度和排列片宽度一定的情况下,减小线束滚动距离有利于改善成像效果。When there are not enough shot points and samples,pre-stack migration will result in severe migration noise,so as to restrict the imaging accuracy in the pre-stack migration.Base on the scatter point pre-stack migration response technique and ray tracing modeling technique,the influence of geometry type,the swath width and the swath rolling distance to the pre-stack migration effects was analyzed in this paper.The analysis results show that the orthogonal geometry is apt to achieve better imaging results compared with oblique and brick-wall geometries.If the spatial sampling density and the swath rolling distance keep the same,the wider swath is apt to reduce migration noise,if the spatial sampling density and the swath width are fixed,the smaller swath rolling distance is favorable for better imaging results.

关 键 词：三维观测系统 叠前成像 偏移噪声 叠前偏移响应 正演模型 

分 类 号：P631.4[天文地球—地质矿产勘探]