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零偏移距地震记录是叠后偏移的基础，常用射线追踪法来制作，但当介质复杂时，射线会出现交叉现象，对三维情况计算量更大。从二维标量波动方程出发，用伪谱法研究了零偏移距地震记录的合成，给出了不同情况下的数值计算公式，并对边界吸收问题作了有效处理。数值计算结果表明了方法的正确性和有效性。该方法可用于偏移中正演模拟的快速计算，且易推广到三维情形。
Zero Offset Seismograms are the basis for poststack migration and are often produced using ray tracing methods. However, when the media is complex, the rays will cross and the computational load will be greater for three-dimensional cases. Based on the two-dimensional scalar wave equation, the pseudospectral method is used to study the composition of zero-offset seismic records. The numerical formulas are given under different conditions and the boundary absorption problem is effectively treated. Numerical results show that the method is correct and effective. The method can be used for fast calculation of forward modeling in migration and is easily generalized to three-dimensional case.