论文部分内容阅读
本文以变换的观点出发来讨论F—K偏移,通过虚速度时深变换的方法,使F—K偏移适应于速度有变化的情况.由于要处理的数据总是有限长的和离散化的,前者会引起端部的边界效应,后者可能产生假频现象,这就要求我们考虑在各个坐标系中所选用的采样间隔的大小、数据道延伸的长短、边界二端的补零道、网格和接头等一系列问题.本文讨论了与这些问题有关的参数意义和选择原则,适当地选取这些参数能提高处理的效率和改善剖面的质量.本文提供了用变速F—K偏移方法计算的模型和实例.计算结果说明变速F—K偏移具有处理效率高、适应于陡倾角偏移和用来做反偏移等特点.变速的F—K偏移对速度变化较敏感,在速度变化较迅速的情况下,建议进行速度光滑.
In this paper, we discuss the F-K migration from the point of view of transformation, and adapt the F-K migration to the case of changing velocity through the method of virtual velocity time-to-depth transformation. Since the data to be processed is always finite and discretized , The former will cause the boundary effect of the end, which may produce aliasing phenomenon, which requires us to consider the size of the sampling interval selected in each coordinate system, the length of the data track extension, the two ends of the boundary complement, Grids and joints, etc. This paper discusses the parameter significance and selection principles related to these problems, and proper selection of these parameters can improve the efficiency of processing and improve the quality of the profile.In this paper, a method of using variable speed F-K offset method The calculated results show that the F-K shift with variable speed has the characteristics of high processing efficiency, adaptation to steep tilt and anti-offset, etc. The F-K shift of the speed change is sensitive to the speed change. Speed changes more rapidly, it is recommended that the speed is smooth.