速度模型误差给叠前深度偏移成像带来的假象  

EFFECT OF INEXACT VELOCITY MODEL ON PRESTACK DEPTH MIGRATION IMAGING

作　　者：潘宏勋[1] 方伍宝[1] 

机构地区：[1]中国石化石油勘探开发研究院南京石油物探研究所,江苏南京210014

出　　处：《物探化探计算技术》2010年第1期64-67,共4页Computing Techniques For Geophysical and Geochemical Exploration

摘　　要：这里借助简单地质模型数值模拟的地震记录,采用分步傅立叶方法进行叠前深度偏移,给出了几种误差速度模型给偏移成像带来的影响。波动方程叠前深度偏移目前是解决地质复杂地区地震成像的一种有效手段,但是速度模型的精确程度,直接影响着成像结果的可信度。局部速度误差影响成像质量,而区域速度误差不仅影响成像质量,更重要的是影响成像的构造形态。所以在应用偏移成果时,一定要根据速度模型的可靠程度进行谨慎解释。The paper shows some prestack depth migration imaging result by using velocity model with certain error to the simulated seismic data with simple geology model.Split-step fourier method was used to carry out prestack depth migration.At present wave equation prestack depth migration is an effective approach for imaging in complex geological area,but the precision of velocity model directly affects the reliability of imaging.Local velocity model error mainly damages imaging quality,while regional velocity model error not only damages imaging quality,but also changes the imaging of structure style or stratum boundary.It should be carefully to do structure interpretation according to the reliability of velocity model.

关 键 词：速度模型 叠前深度偏移 分步傅立叶 

分 类 号：P631.443[天文地球—地质矿产勘探]