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.
出处
《物探与化探》
CAS
CSCD
2006年第6期541-544,共4页
Geophysical and Geochemical Exploration
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
zero offset section
common midpoint （CMP） gather
common reflection point （CRP） gather
stacking
prestack time migration
