三维观测系统优化设计的双聚焦方法

双聚焦法是一种面向特定勘探目标的三维观测系统优化设计新方法，它可以定量预测地震成像的空间分辨率、振幅精度和AVP特性。常规的CMP面元属性分析法是宏观的、全局性的，它强调获得最佳的水平叠加效果；而双聚焦特性分析法是面向指定目标的、局部性的，它强调获得最佳的偏移成像精度。因此，将两种方法结合在一起，相辅相成，提高观测系统优化设计的效果。由于不同介质模型的双聚焦计算方法差异较大，因此本课题研究分三步进行，即均匀介质算法、层状介质算法、复杂介质算法。本文完成了第一步均匀介质的双聚焦算法研究和软件研制，目前可作为三维观测系统优化设计中的补充。

Double focusing method for 3-D geometry-optimized d esign.

The double focusing method is a new method for special-target-oriented 3- D geometry-optimized design,which can quantitatively predict the spatial resolu tion, the precision of amplitude and the AVP character of seismic imaging.The or dinary analysis of CMP bin attribution is macro and overall,which emphasizes on obtaining the optimal horizontal stacking effects;but the analysis of double fo cusing character is special target-oriented and regional,which emphasizes on o btaining the optimal precision of migrated imaging.Therefore,combination of the two methods can complement each other and improve the effects of geometry-o ptimized design.Because of different media model having big difference in doubl e focusing computation,the study of the task needs to be carried out in three steps:algorithm in homogeneous media,algorithm in layered media and algorith m in complex media. The paper finished the first step,that is the study of do uble focusing algorithm in homogeneous media and the development of correspondin g software,which is as a supplement of 3-D geometry-optimized design as a supp lementary method.