双参数展开CRP叠加和速度分析方法研究

椭圆展开共反射点(CRP)方法可以获得比常规倾角时差校正(DMO)方法更近似的零偏移距时间剖面和相应CRP速度场.大量研究和实践证实，在非均质性较弱的地区，该方法取得的成果显著.但由于该方法没有考虑速度的横向变化和转换波等情况，当地下介质存在较强非均质性时，该方法不再准确，需要引进反映速度横向变化的双参数(上行波与下行波的平均速度和速度比)进行改进.本文详细推导了引入双参数后的叠加和速度分析算法，并通过数值模型和地震资料处理证实，修正后的算法可以更好地解决地质复杂地区速度建模和叠加成像问题.

Research of dual parameters evolving common reflection point stack and velocity analysis method

We can get more accurate zero-offset section and corresponding CRP velocity field by ellipse evolving common reflection point（CRP）than by conventional dip moveout(DMO). Many studies and tests confirm that its effect is remarkable in weakly heterogeneous media area. However, it does not take transverse changes of velocity and converted waves into account. When the media is strongly heterogeneous, the method is not exact any longer. We introduce dual parameters (average velocity and velocity ratio of up-going wave velocity and down-going wave velocity) which reveal transverse changes of velocity to optimize ellipse evolving CRP stack. This paper reasons out detailed stack and velocity estimation arithmetic with dual parameters. By using theoretical model and seismic data processing, optimized arithmetic can more ideally solve the questions of velocity modeling and stack imaging in complex geology area.