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三维地震数据通常是在矩形网格中记录和处理,其采样一般是用常规的一维方法得到。对于三维数据集。带状区(傅里叶空间区,区内振幅谱不为零)可用以两个锥形为界的区域来近似。考虑该带状区的特殊形状,我们可以应用三维采样方法,这种方法对采样的要求比一维方法更低;即只需更少的采样点就能达到相同程度的精确度。该三维采样方法是研究规则的非矩形采样网格。 本文探讨了在一个六方形采样网格上进行的三维地震数据的记录和处理。在六方形采样网格上进行的三维地震数据采集,是一个经济有效的可供选择的方法,因为它所需的采样点比矩形采样网格少13.4％。该六方形采样降低了三维地震数据存储和处理的费用。 在六方形网格上采样的三维地震数据集情况下,本文用合成实例介绍和说明了用于三维离散谱计算和道内插的快速算法。对于三维相移偏移,采用这种算法,六方形采样大约节省13.4％的数据存储和计算时间。
Three-dimensional seismic data is usually recorded and processed in a rectangular grid, and its sampling is generally obtained by a conventional one-dimensional method. For 3D data sets. Bands (Fourier space region, non-zero amplitude spectrum in the region) can be approximated by a region bounded by two cones. Considering the special shape of the ribbon, we can apply a three-dimensional sampling method that requires less sample than the one-dimensional method; that is, it achieves the same level of accuracy with fewer sampling points. The three-dimensional sampling method is to study the regular non-rectangular sampling grid. This paper discusses the recording and processing of 3D seismic data on a hexagonal sampling grid. 3D seismic data acquisition on a hexagonal sampling grid is a cost-effective alternative since it requires 13.4% fewer sampling points than a rectangular sampling grid. This hexagonal sampling reduces the cost of storing and processing 3D seismic data. In the case of a 3D seismic data set sampled on a hexagonal grid, a fast algorithm for three-dimensional discrete spectrum calculation and channel interpolation is introduced and illustrated by a synthesis example. For the three-dimensional phase shift, using this algorithm, hexagonal sampling saves about 13.4% of the data storage and calculation time.