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69本文根据三维偏移处理两步法的原理，即先沿主测线方向进行二维偏移，然后在垂直主测线方向上抽取时间剖面，再做一次二维偏移（次序反过来也一样），就可以达到真三维偏移效果。本文根据该原理在二维t0图偏移过程中，使用全部二维叠偏剖面的解释成果数据，并利用已建立的三维速度场，先沿主测线做一次垂直测线方向的t0图偏移，再沿联络测线做一次垂直测线方向的t0图偏移，最后做变速时一深转换来编制构造图。这种方法除了沿二维测线作侧面校正外，同时还验证了偏移校正后反射界面真正垂直时间的交点闭合情况。此外，本文还阐述了人机联作工作站上利用叠偏剖面作图的解释方法及交点闭合问题。
In this paper, we deal with the two-step principle according to the three-dimensional offset, that is, first two-dimensionally offset along the main survey line, then extract the time profile in the direction perpendicular to the main survey line and make a second-dimensional offset The same), you can achieve the true three-dimensional offset effect. Based on this principle, we use the interpretation data of all two-dimensional cross-sections in the process of two-dimensional t0 map migration. Using the established three-dimensional velocity field, we first make a t0 map with vertical line direction along the main line Move, and then do a vertical line along the t0 map survey of the survey line offset, and finally do a deep shift conversion to build the map. In addition to the lateral correction along the two-dimensional line, this method also verifies the intersection closure of the true perpendicular time of the offset-corrected reflection interface. In addition, this article also describes the man-machine workstations on the use of overlapping profile mapping method of interpretation and intersection closure problem.