利用多次叠前时间偏移提取精确的偏移速度

利用多次叠前时间偏移提取精确的偏移速度

叶景艳1，郑晖1，卢俊1，李清2

1. 华东有色地质勘查局，南京 210007； 2. 中国石油华北油田公司勘探开发研究院，任丘 062552

收稿日期:2009-12-20 修回日期:2009-12-20 出版日期:2009-12-20 发布日期:2009-12-20

Practical and Fast Velocity Analysis by Multiple Pre-Stack Time Migration

YE Jing-yan1, ZHENG Hui1, LU Jun1, LI Qing2

1. Eastern China Mineral Exploration and Development Bureau for Non-Ferrous Metals, Nanjing 210007, China;2. Research Institute of Exploration and Development, Huabei Oilfield Company, PetroChina, Renqiu 062552, China

Received:2009-12-20 Revised:2009-12-20 Online:2009-12-20 Published:2009-12-20

摘要/Abstract

摘要： 提出了一种利用多次叠前时间偏移提取偏移速度模型的方法，以提高成像效果。通过常规的叠前时间偏移速度分析方法，提取出最好的初始速度模型，然后以此速度模型的80%至120%进行扫描，用这些速度模型进行偏移，将得到不同质量的成像剖面，他们有合理的和不合理的。准确的偏移速度可以通过选用正确的速度模型百分比估算出来，可使成像效果得到最显著的提高。此方法用于实际数据，结果证明该方法提取的偏移速度模型非常接近真实的速度。由于无需对不同百分比速度模型重复计算旅行时，多次叠前时间偏移所耗费CPU时间并不多。

Abstract: A practical and fast approach is presented to update the migration velocity model for improved imaging. It is achieved by analyzing multiple migration sections in the control lines by scanning the migration velocity from 80% to 120% of the best available velocity model. The different percentages of the velocity model produce reasonable or unreasonable imaging sections with varying degrees of clarity. The correct migration velocity can be estimated by integrating the right percentage of the velocity model, which produces the greatest improvement. Applying this approach to real data shows that the estimated migration velocity reliably converges to the correct velocity. The consumed CPU time of the multiple migration is not too much, because multiple travel-time calculations for the different percentages of the velocity model are unnecessary.

叶景艳，郑晖，卢俊，李清. 利用多次叠前时间偏移提取精确的偏移速度[J]. J4.

YE Jing-yan1, ZHENG Hui1, LU Jun1, LI Qing2. Practical and Fast Velocity Analysis by Multiple Pre-Stack Time Migration[J]. J4.