| 基于行波分离的VTI介质逆时偏移 |
| |
| 引用本文： | 郭旭,黄建平,李振春,黄金强,朱峰.基于行波分离的VTI介质逆时偏移[J].物探与化探,2019(1):100-109. |
| |
| 作者姓名： | 郭旭 黄建平 李振春 黄金强 朱峰 |
| |
| 作者单位： | 中国石油大学(华东)地球科学与技术学院 |
| |
| 基金项目： | 中国科学院战略性先导科技专项(A)(XDA14010303);国家油气重大专项(2016ZX05002-005-07HZ;2016ZX05014-001-008HZ);山东省青岛市科技计划项目(16-5-1-40-jch);自主创新科研计划项目(理工科)(17CX05011) |
| |
| 摘 要： | 现阶段,各向同性介质假设已经不能满足复杂地质构造条件下的成像需求,忽略介质各向异性影响会使速度估计不准确,成像精度降低。为此,笔者从VTI介质一阶速度—应力方程出发,利用Poynting矢量特性对地震波进行方向行波分离,得出了基于上下行波分离的互相关成像条件,并将其应用在复杂VTI介质中。通过层状模型和SEG/EAGE岩丘模型测试验证了该算法的有效性以及在成像上的优越性;另外,当偏移速度不准确时,本文方法仍能够有效压制偏移噪声,成像质量更佳。
|
| 关 键 词： | Poynting矢量 行波分离 VTI介质 逆时偏移 一阶方程 |
Reverse time migration in VTI media based on wavefield decomposition |
| |
| GUO Xu,HUANG Jian-Ping,LI Zhen-Chun,HUANG Jin-Qiang,ZHU Feng.Reverse time migration in VTI media based on wavefield decomposition[J].Geophysical and Geochemical Exploration,2019(1):100-109. |
| |
| Authors: | GUO Xu HUANG Jian-Ping LI Zhen-Chun HUANG Jin-Qiang ZHU Feng |
| |
| Institution: | (School of Geosciences,China University of Petroleum (East China),Qingdao 266580,China) |
| |
| Abstract: | Seismic anisotropy characterized by velocity anisotropy will inevitably affect the kinematic characteristics of underground seismic waves.Ignoring the anisotropy of the media will result in inaccurate velocity extraction and thus affect the imaging of target region.In view of such a situation,the authors carried out a study of anisotropy in this paper.According to the first-order velocity stress equation in VTI media,the authors obtained the cross-correlation imaging condition based on wavefield separation which used Poynting vector.Then the authors applied it to complex VTI media,and demonstrated the validity and superiority of the algorithm by numerical experiments.This method produces better images with less noise even for inaccurate migration velocities. |
| |
| Keywords: | Poynting vector wavefield separation VTI media RTM first-order equation |
| 本文献已被 CNKI 维普 等数据库收录！ |
|
