转换横波共炮记录单程声波方程正演模拟

COMMON SHOT RECORDS FORWARD MODELING OF CONVERTED SHEAR WAVE WITH ONE WAY WAVE EQUATION

本文分别把分离的纵波和横波方程分裂为各自的两个单向旁轴方程（Ｊ．ＦＣｌｅａｒ－ｂｏｕｔ），然后用单程纵波和横波方程，结合相位移加有限差分混合波场延拓法（Ｄ．Ｒｉｓｔｏｗ），在共炮记录叠前深度偏移原理的基础上，借鉴几何地震学的射线法两点问题原理，提出合成转换Ｐ—ＳＶ波共炮记录的时间一致性原理和逆过程方法，从而推导出精确的转换Ｐ—ＳＶ波共炮记录正演模拟算法，由于单程延拓波场，可完全解决多次反射波问题。

In this paper, the two independent full wave equations of P and S are split into one way wave equations(J.F.Clearbout), respectively. Then combining those equations with phase shift plus finite difference hybrid extrapolation method(D.Ristow), and based on 'two point principle' of ray tracing in the field of geometrical seismology and common shot records pre stack depth migration method, 'Same time pronciple' and 'Inverse process' are presented, and then a set of accurate and efficient formulas for forward modeling of converted P-SV wave's common shot records are deduced. Because the wave field is extrapolated in single direction, multi reflection can be controlled entirely.