This paper discusses the appearance of dipping plane interface and the formula of 3d migration for normal depth section and 3d migration in two steps.

本文讨论了倾斜平界面的表现形态和法向深度剖面的三维偏移归位公式，同时研究了二步法三维偏移。

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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.

利用CDP道集，可以直接获得共中心点叠加时间剖面或视深度剖面，由此可转换为法向深度剖面。

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The depth section overcomes the shortage of the time section, which can be influenced by the thickness and velocity of layers jointly, and shows the thickness of strata distinctly.

深度剖面克服了时间剖面受地层厚度和地层速度共同制约的缺点，有利于识别低幅度构造。

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You can always go to the BBC News website's in-depth section on savings and investments for the latest news and guides.

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You can always go to the BBC News website's in-depth section on pensions which also explains the state of UK pensions in graphics. and includes a video guide to the different types of pension schemes.

BBC: How to cope with financial difficulties