Common focus point (CFP) migration based on the equal travel-time principle is a kind of pre-stack depth migration method through focusing in both emission and detection.
The common-depth-point technique merely means the manifold repetition of each reflection observation with different source-detector geometry.
其深度点技术仅意味着用不同的震源——检波器的分布形式多次重复每个反射观测。
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By using the CDP gather, common-mid-point stacked time section or apparent depth section can directly be obtained, which can be converted into normal depth section.