一种棱柱波逆时偏移方法及优化  

An optimized reverse time migration approach for the prism wave

作　　者：黄建平[1,2] 刘培君 李庆洋 李振春 雍鹏[1] 

机构地区：[1]中国石油大学(华东)地球科学与技术学院地球物理系,山东青岛266580 [2]海洋国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071

出　　处：《石油物探》2016年第5期719-727,共9页Geophysical Prospecting For Petroleum

基　　金：国家重点基础研究发展计划(973计划)(2014CB239006);国家自然科学基金(41274124);国家科技重大专项(2016ZX05014001;2016ZX05002)联合资助~~

摘　　要：由于地下照明范围有限,断层及盐丘侧翼等高陡构造准确成像一直是地震处理中的难点。以陡倾角构造产生的棱柱波信息为研究对象,推导了具有明确物理含义且不含一次波的棱柱波逆时偏移成像算子,并引入Poynting成像条件及平面波解构算子对成像方法进行优化。在编程实现优化算法的基础上,对倒T模型和复杂丘体边界模型进行了试算,结果表明:棱柱波逆时偏移算法降低了对初始速度模型的依赖,高陡构造成像清晰,压制偏移噪声的效果较好。Traditional seismic data processing technique has some difficulties in imaging high-steep s t ruc ture s , such as faults and salt-dome flank and so on, due to its limited geometry distribution Different from the traditional reflection-based migration method, we derive the prism wave reverse time migration operator with the clear physical meaning by considering the prism wave phases as the useful information In addition, the Poynting imaging principle and plane-wave deconstruction filter operator are introduced to improve the imaging resolution The empirical results with two typical models suggest that the prism wave reverse time migration approach can get a clear image of the high-steep structure with better migration noise suppression as well as the independence on the accuracy of the initial migration velocity model.

关 键 词：陡倾角构造成像 棱柱波 逆时偏移 Poynting矢量 平面波解构滤波 

分 类 号：P631[天文地球—地质矿产勘探]