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采用嵌套剖分法存储有限差分离散频率空间域声波波动方程所形成的大规模稀疏系数矩阵,极大地减少了对计算机内存需求和计算量。使用二维频率空间域声波多炮快速模拟计算流程,提高了数值模拟的计算速度。详细分析讨论了频率域正演模拟时所出现的震源奇异性问题,并提出了相应的解决措施,理清了频率空间域声波数值模拟时正确选取参数的原则。通过对胜利油田有代表性的复杂地质构造速度模型的数值模拟试验,证明嵌套剖分法具有占计算机存储量少、计算速度快、计算效率高等优势,完全能够用于模拟实际资料。
The nested partition method is used to store the large-scale sparse coefficient matrix formed by the acoustic wave equation of the finite difference discrete frequency space domain, which greatly reduces the computer memory requirements and computation. Using two-dimensional frequency space domain acoustic multi-gun rapid simulation calculation process, improve the numerical simulation of the calculation speed. The problem of source singularity in forward modeling of frequency domain is analyzed and discussed in detail, and corresponding solutions are proposed. The principle of correctly selecting parameters in numerical simulation of sound waves in frequency domain is clarified. Through the numerical simulation test of the representative complex geological structure velocity model in Shengli Oilfield, it is proved that the nested meshing method has the advantages of less computer memory, faster computing speed and higher computational efficiency, which can be used to simulate actual data.