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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。一个地下界面在不同形式的地震剖面上将有不同的表现形态。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。无论是二步法三维包络偏移、二步法绕射偏移,还是共中心点叠加视深度剖面的二步法三维偏移,它们的实现步骤的第一步是沿测线方向偏移,第二步则是绕测线转动,其转动角由法向平面和铅垂平面间的夹角决定。第一步偏移的实质是在铅垂平面内完成偏移归位,第二步偏移是在空间内完成侧面波的空间归位。
By using CDP gathers, we can directly obtain the time-sharing profile or depth-of-view profile, which can be converted into normal depth profile. An underground interface will have different manifestations in different forms of seismic profiles. In this paper, we discuss the three-dimensional migration homing formula of the inclined plane interface and the normal depth profile, and study the two-step three-dimensional migration. Whether it is the two-step three-dimensional envelope offset, the two-step diffraction offset, or the two-step three-dimensional offset of the CCS plus depth of field profile, the first step in their implementation is offset along the line of survey , The second step is to rotate around the survey line, the angle of rotation from the normal plane and the angle between the vertical plane determined. The essence of the first step offset is to complete the offset homing in the vertical plane. The second step offset is to complete the space homing of the side waves in space.