波前快速推进法三维走时计算技术

3D TRAVEL TIME CALCULATION TECHNIQUE WITH PRE-WAVE QUICK PROGRADING METHOD

三维叠前深度偏移简称 3DPSDM ,是解决复杂构造和强速变化条件下地质体成像问题的有效工具 ,走时计算是其配套技术。波前快速推进算法是一种非常快速、准确稳定的计算走时的方法 ,不仅计算速度极快 (大约比有限差分法快 4～ 5倍 ) ,而且对任何复杂速度场都具有无条件稳定性。该算法可用于三维克希霍夫叠前偏移、三维克希霍夫叠后偏移、三维速度分析和三维克希霍夫正演模型计算等。根据此算法 ,在SGI并行机上研制了并行计算软件 ,并对其进行了基准点测试。同时 ,还给出了SEG

D pre stack depth migration (3DPSDM) is an effective tool to solve the problem of geologic body imaging in comprehensive structure and strong speed change. Travel time calculation is its auxiliary technique. Pre wave quick prograding method is a quick and accurate method for the calculation of travel time. It has non conditional stability for any comprehensive speed field. This method can be used in 3D Kirchoff pre stack migration, 3D Kirchoff post stack migration, 3D speed analysis and 3D Kirchoff forward model calculation. Using this method, this paper studies parallel calculation software in SGI parallel computer and tests its reference point. It also gives a calculation example of SEG/EAGE model.