一种自动叠前偏移速度分析方法的实现和处理

A Method for Implement and Processing the Automatic Seismic Pre-stack Migration Velocity Analysis

速度分析在叠前偏移处理中非常重要,偏移速度的准确与否直接影响资料成像的精度;自动偏移速度分析软件基于初始偏移速度,对经过前期处理的CRP道集按初始偏移速度的一定百分比进行偏移扫描叠加,得到对应百分比速度的CRP道集和偏移剖面,结合偏移速度扫描自动拾取技术,自动拾取的计算是以成像道集、速度场和层位数据为信息源,以一定的CRP间隔进行,它在层位缺失(局部缺失或不连续)的情况下也可以计算。自动偏移速度分析软件采用Qt开发交互界面,输入成像剖面、速度和层位数据,以速度分析自动拾取为主,可进行交互修改。

Velocity analysis is very important in the seismic pre-stack migration; the veloci- ty model is accurate or not will directly affect the imaging precision of seismic data. The a- nalysis software for automatic migration velocity is based on the initial migration velocity. After migration scanning stack for the pre-processed CRP traces gathers according to a cer- tain percentage of initial migration velocity, the CRP traces gathers and migration sections of corresponding percentage velocity may be obtained. Combined with the migration veloci- ty scanning automatic picking technology, the calculation of automatic picking is based on imaging gathers, velocity field and horizons data as information source, and in a certain in-terval of CRP, it can also be calculated under the condition of absence of the horizon （par- tial deletion or discontinuous）. The analysis software for automatic migration velocity with the interactive interface of QT software, being input imaging profile, velocity model and horizons data, is dominated by velocity analysis and automatic picking, which can be modi- fied interactively.