张冰,,
王维红,
石颖
东北石油大学地球科学学院, 大庆 163318
基金项目: 国家自然科学基金(41930431，41804133，42004094，42004095)，中国石油科技创新基金(227190002)和黑龙江省油气藏形成机理与资源评价重点实验室(11024300418)联合资助
详细信息
作者简介: 徐嘉亮, 男, 1985年生, 博士, 讲师, 主要从事偏移成像、速度建模和构造及属性反演研究.E-mail: 84829525@qq.com
通讯作者: 张冰, 女, 1989年生, 博士, 讲师, 主要从事储层预测和压力预测研究.E-mail: aaayin0909@126.com
中图分类号: P631收稿日期:2020-10-01
修回日期:2021-02-17
上线日期:2021-04-10
Establishment of an one-step method for modeling tomographic velocity
XU JiaLiang,ZHANG Bing,,
WANG WeiHong,
SHI Ying
School of Earth sciences, Northeast Petroleum University, Daqing 163318, China
More Information
Corresponding author: ZHANG Bing,E-mail:aaayin0909@126.com
MSC: P631--> Received Date: 01 October 2020
Revised Date: 17 February 2021
Available Online: 10 April 2021
摘要
摘要:像域层析速度建模方法利用偏移道集剩余曲率构建目标函数并迭代更新速度场.迭代更新速度场需反复进行叠前深度偏移，对于三维地震数据，偏移成像计算时间长，迭代更新过程成倍增加层析成像计算时间.本文由剩余时差拾取机理出发，提出隐式剩余时差概念，并建立隐式剩余时差与剩余速度之间的函数关系，利用该关系通过一次计算就可以对剩余速度进行精确求取并对速度模型进行精确更新，该方法避免了常规层析方法需要多次迭代的流程.由模型数据测试及实际数据应用证明，本文提出方法是有效可行的，该方法与常规层析方法进行比较，在保证提高层速度场建模精度的同时有效提高计算效率，为后续偏移成像节省大量时间.
关键词: 层析成像/
一步法/
隐式剩余时差/
更新迭代
Abstract:The modeling of tomographic velocity requires the use of migration results to update and iterate the layer velocity field. When the velocity is not accurate, the phase axis will bend; this kind of bending in the geophysics field is called residual curvature. In this paper, the residual curvature is analyzed in common domain image gathers, and a concept of the true residual curvature is proposed, which includes zero offset residual curvature and non-zero offset residual curvature. These two kinds of residual curvature have great influence on velocity update. According to this concept, a new method of true residual curvature tomography is proposed in this paper. This method can make the layer velocity model updating convergence more fully. Proved by the model data and actual data, the proposed method is effective and feasible. Compared with the conventional method, our method has faster convergence speed and higher accuracy. It can ensure the precision of the modeling layer velocity field and enhance the calculation efficiency. It saves a lot of time for subsequent migration imaging and other processes.
Key words:Tomography/
One-step method/
Implicit residual time difference/
Iterative update
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http://www.geophy.cn/data/article/export-pdf?id=6076842bc23e6710c26d5b38
