摘要
对于复杂介质,炮域共成像道集和偏移距域共成像道集遇到了麻烦:对于相同到达旅行时和相同的水平慢度,反射同相轴可能来自地下界面不同的点,即地下界面的点存在多解性。对于地下界面的每一点,角度域共成像道集却惟一地定义了射线对,因此,数据体中的每一个同相轴只对应地下界面一个点。利用波动方程偏移能够生成可以用于偏移速度分析和振幅随入射角变化分析的角度域共成像道集。
Shot domain common imaging gathering and migration domain common imaging gathering come across problems in complex media, the reflection events may be from different subsurface points for the same travel times and horizontal slowness, namely the points on the subsurface boundary have multi-resolutions. Because of the angular domain common imaging gathering merely defined ray duplet for each subsurface point, each event in data volume merely corresponds to one point. The angular domain common imaging gathering, which can be used to analyze the migration velocity and amplitude versus angle, can be made by wave equation migration.
出处
《油气地球物理》
2004年第2期10-12,共3页
Petroleum Geophysics
关键词
波动方程
偏移角度域
共成像道集
偏移速度分析
同相轴
反射点
angular domain, common imaging gathering, wave equation migration, migration velocity analysis
