数学检波器与波动方程地震叠前正演

地震非零炮检距正演模拟技术在叠前地震资料处理和解释中有重要意义.叠前正演通常用射线追踪法和全程波动方程法来实现.这些方法在计算效率和记录信噪比等方面存在许多固有的问题.作者通过提出数学检波器(MG)的概念和方法,使利用单程波动方程实现叠前正演成为可能.文中给出了用单程波动方程法对一个复杂地质模型形成8个共炮点地震记录的例子.在这些共炮记录中,来自复杂地质模型的反射波和绕射波十分清晰.记录质量好且计算效率高.更重要的是,利用作者研制的新方法可获得没有多次波、直达波和其它干扰的高信/噪比地震叠前正演记录.

Mathematical geophones with applications to seismic prestacking forward modeling

Nonzero offset or prestacking seismic forward modeling (SFM) usually performed by ray tracing and full-wave equation techniques plays an important role in prestacking seismic data processing and interpretation. This paper introduces a concept of mathematical geophone (MG) . Based on it, a new kind of nonzero offset SFMs with high calculating efficiency can be easily developed by using one-way wave equation. The paper gives an example of 8 common shot seismic gathers for a complex geological model by using one-way wave equation techniques. The results show that the reflections and diffrations in those seimic gathers are quite clear. It is also important that high S/N ratio SFM records without any multiple waves, direct waves and other false events can be obtained by the new methods.