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王振华:波场沿上行波波前延拓的全倾角有限差分法波动方程偏移,《石油地球物理勘探》,23(1)1988:55～66全倾角有限差分法波动方程偏移,只要在上行波边界条件约束下合理地选择波场延拓方向,就能在原坐标系中实现。线性坐标变换的作用仅在于简化方法实现过程和减少计算量。采用的差分方程与15°差分方程形式上基本一致,加吸收的差分方程既能保证波场正确归位,又能消除“交叉干扰”。实例表明,应用该方法使偏移剖面的质量有很大提高。
Wang Zhenhua: Full-tilt finite-difference wave equation migration along wavefront continuation of up-going wavefront, Petroleum Geophysical Prospecting, 23 (1) 1988: 55-66 Full-tilt finite difference method wave equation migration, Reasonable choice of the wave field extension direction under the constraints of the upstream wave boundary conditions can be achieved in the original coordinate system. The function of linear coordinate transformation is only to simplify the process of the method and reduce the computational complexity. The difference equation adopted is basically the same as that of the 15 ° difference equation, and the difference equation of absorption can not only ensure the correct return of the wave field but also eliminate the “cross interference”. The examples show that using this method greatly improves the quality of the offset profile.