小波束叠前深度偏移与照明分析  

Beamlet Pre-stack Depth Migration and Illumination Analysis

作　　者：张恩嘉[1] 王西冲[1] 梁栋[1] 唐小彪[1] 

机构地区：[1]成都理工大学信息工程学院,四川成都610059

出　　处：《天然气地球科学》2009年第4期581-585,共5页Natural Gas Geoscience

摘　　要：利用小波束域波场分解和传播在空间和方向上的双重局域性,将小波束域波场依据相应的外推公式进行延拓,最终应用成像条件求取成像值。在地质目标处选取多个成像点,可以得到面向目标的控制照明偏移成像,在多个层位上选取多个成像点进行控制照明叠前深度偏移,可以得到整块区域的成像。针对Marmousi模型的试算结果表明小波束偏移的有效性及其在提高计算效率方面的巨大优势。通过照明,选择面向目标的有效照明小波束,进行部分小波束偏移,可以提供更好的成像质量和计算效率。Based on the localization properties of wavefield decomposition and propagation in the beamlet domain, and according to relevant extrapolation formula, the beamlet domain is implemented, and finally imaging values are computed using image-forming condition. By selecting multiple imaging points at geologic targets, the target-oriented controlled illumination migration imaging can be gained, and by selecting multiple imaging points on multiple horizons to control illumination prestaek depth migration, the image of the whole area can be acquired. The test results of Marmousi model shows that the method has a great advantage in improving the efficiency of computing. We can select the target-oriented effective illumination beamlet to accomplish some part of beamlet migration, thus imaging quality and the efficiency of computing can be better.

关 键 词：小波束 控制照明 叠前深度偏移 照明分析 

分 类 号：TE132.14[石油与天然气工程—油气勘探]