共聚焦点速度建模方法述评  

Confocal Point Velocity Modeling Method Review

作　　者：王玺凯 赫云兰[2] Wang Xikai;He Yunlan(School of Geosciences and Surveying Engineering,CUMTB,Beijing 100083;State Key Laboratory of Coal Resources and Safe Mining,CUMTB,Beijing 100083)

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院,北京100083 [2]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《中国煤炭地质》2021年第9期56-60,共5页Coal Geology of China

基　　金：国家重点研发计划项目(2019YFC1805504);中央高校基本科研业务费专项资金(2021YQMT01,2021YJSDC06)。

摘　　要：近地表偏移成像技术的发展经历了从叠后到叠前、从时间域到深度域的变化。在叠前深度偏移领域,速度模型的正确性和精度都将影响成像结果,因此速度建模是实现叠前深度偏移的关键。共聚焦点技术基于等时原理,通过双聚焦或共聚焦偏移来实现偏移成像,为实现高精度、高效率的叠前深度偏移分析提供了条件。根据不同的地震地质条件应用产生了四种共聚焦点建模方法,即层速度扫描法、层析速度分析法、约束参数反演法、交互速度分析法。通过分析各方法的基本原理及适用条件,对四种建模方法的计算结果和计算量等进行了对比,并指出了共聚焦点技术存在的问题及突破技术瓶颈的方向。The development of near-surface migration imaging technology has experienced variations from poststack to prestack,from time domain to depth domain.In prestack depth migration domain,correctness and accuracy of velocity model will impact imaging result,thus the velocity modeling is the key to realize prestack depth migration.Confocal point technology is based on isochronous principle,through double focusing or confocal migration to realize migration imaging,provided condition to realize high-accuracy,high-efficiency prestack depth migration analysis.According to different seismic-geologic conditions applied four confocal point modeling methods,i.e.horizon velocity scanning method,tomographic velocity analysis method,constrained parameter inversion method and interactive velocity analysis method.Through various method fundamental principles and applicable conditions analyses have carried out comparison between four modeling method computed results and amounts,pointed out confocal point technology existed problems and orientation to breakthrough technical bottlenecks.

关 键 词：共聚焦点技术 速度建模 层速度扫描法 层析速度分析法 约束参数反演法 交互速度分析法 

分 类 号：P631.4[天文地球—地质矿产勘探]