多聚焦成像技术及应用研究

The Multifocusing imaging and it's application

中国地质大学地球物理与空间信息学院,湖北武汉 430074

Department of Geophysics, China University of Geosciences, Wuhan 430074, China

多聚焦技术是一组以“巨模型-独立成像”为特征的地震成像方法.该技术实现了二维多次覆盖叠前数据到零偏移距剖面的转换,并用聚焦参数的最优化过程代替了传统偏移方法中的速度模型修正.避免了“速度难题”。首先介绍了多聚焦技术的基本原理和确定多聚焦参数的方法;然后利用多聚焦成像技术对理论模型的正演模拟记录进行了时差校正和叠加,正演模拟记录是用射线追踪和有限差分法获得的;最后用实际数据进行了试算。将多聚焦叠加结果与理论记录以及试算结果与常规叠加剖面进行了对比分析.分析结果表明,多聚焦成像方法的成像效果很好。

Multifocusing imaging methods belong to a group of methods and characterized by macro-model independent imaging. This paper has discussed multifocusing methods in detail and multifocusing operator. Two theoretical models have separately designed by ray tracing method and finite difference modeling, and multifocusing method is applied to time correction and stack. The multifocusing stack result is as compared with theoretical one. One real data example is presented. Comparison with multifocusing method and common method is also presented. The results demonstrate that MF shows stability and usability in imaging and it is an effective stack method.