叠前时间偏移成像技术及其应用  

THE PRESTACK TIME MIGRATION TECHNOLOGY AND ITS APPLICATION

作　　者：崔汝国[1] 覃天[1] 凌勋[2] 贾明辰[2] 段云卿[1] 

机构地区：[1]中国地质大学地下信息探测技术与仪器重点实验室,北京100083 [2]中国石油新疆油田分公司勘探开发研究院,新疆克拉玛依834000

出　　处：《物探与化探》2006年第6期541-544,共4页Geophysical and Geochemical Exploration

摘　　要：零炮检距剖面是地震反射成像过程中的重要成果。通过弯曲反射界面模型,分析了共中心点(CMP)道集与共反射点(CRP)道集的差别,认为当反射界面倾斜时,常规处理中的CMP叠加不能得到准确的零偏移距剖面,而沿CRP道集叠加的叠前时间偏移能得到准确的零偏移距剖面,另外,还介绍了叠前时间偏移的实现方法和步骤,包括预处理、偏移速度场的建立和偏移后CRP道集的处理等,并结合实际资料进行了效果分析。The zero-offset （z0 ） section is an important achievement in seismic reflection imaging. The differences between the common midpoint （CMP） and the common reflection point （CRP） are discussed on the basis of the dome-like reflector model. In usual seismic data processing, we cannot get the correct z0 sections if oblique layers are imaged. However, the prestack time migration technique using CRP stacking can help us to obtain the correct zo sections. This paper discusses the key steps in the application of such prestack time migration techniques as seismic data preprocessing, construction of migration-velocity field and CRP gather processing after migration. The processing effects are demonstrated with real data.

关 键 词：零偏移距剖面 共中心点道集 共反射点道集 叠加 叠前时间偏移 

分 类 号：P631.4[天文地球—地质矿产勘探]