【摘要】 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。更多还原

【Abstract】 The zero offset seismic record is a base for poststack migration. Usually, it is aecomplished by the ray tracing method, however, rays may cross for a complicated media, and computation is time consuming for a 3 D case. In the paper, basing on the 2 D scalar wave equation, we study the synthesising problem of zero offset section with the pseudospectral method. Not only we give the numerical computation formulae for different cases, but also solve the boundary absorbing problem effectively. Numerical calculations show the correctness and effectiveness of methods. So we supply a rapid modelling method for migration, we also can extend it to three dimensions case easily.更多还原