论文详情

山前带地震数据共成像点道集层析速度反演建模方法研究

石油物探

2012年 51卷第No. 6期

阅读：68

Title

Common imaging gathers tomography velocity inversion and model building in foothill area

单位

1.中国石油化工股份有限公司石油物探技术研究院，江苏南京211103；2.同济大学海洋与地球科学学院波现象与反

演成像研究组，上海200092

Organization

Zhang Bing,Sinopec Geophysical Research Institute,Nanjing 211103,China

摘要

山前带深度域速度建模由于采集数据的信噪比低和道间时差大而困难重重。由于叠前深度偏移的同相叠加作

用，基于初始模型得到的共成像点道集具有比CMP道集更高的信噪比，并且共成像点道集上残存的剩余时差可以用

于通过层析反演的方式来全局更新速度模型，适用于山前带深度域模型的迭代更新。共成像点道集层析速度反演还

非常适用于非水平地表下的速度估计。在前人研究的基础上，进行了共成像点道集层析速度反演方法研究，并且用

三维SEG盐丘模型和某山前带实际数据进行了测试。结果表明，基于共成像点道集的层析速度反演建模方法能够提

高复杂山前带地震数据成像处理中速度模型的精度。

Abstract

Depth-domain velocity modeling in foothill area is difficult because of the low S/N and large moveout between

gathers.Common imaging gathers (CIGs) have higher S/N than CMP gathers for the in-phase stack effect of prestack depth

migration.Meanwhile,the residual moveout on CIGs can be used to wholly update the depth velocity model by tomography in

foothill area.Tomography velocity inversion based on CIGs is very suitable for the velocity estimation of rugged topography.On

the basis of previous research,the method of CIGs tomography velocity inversion was tested on 3-D SEG salt dome model and

real data from foothill area.The results show that tomography velocity inversion based on CIGs can improve the precision of

depth velocity model in complicated foothill area.

关键词：

层析速度反演; 速度建模; 山前带地震勘探; 共成像点道集; 叠前深度偏移;

Keywords:

tomography velocity inversion; velocity model building; piedmont seismic exploration; common imaging

gathers; prestack depth migration

;

基金项目

DOI

10.3969/j.issn.1000-1441.2012.06.007