SMIwiz: An integrated toolbox for multidimensional seismic modelling and imaging

This paper contributes an open source software - SMIwiz, which integrates seismic modelling, reverse time migration (RTM), and full waveform inversion (FWI) into a unified computer implementation. SMIwiz has the machinery to do both 2D and 3D simulation in a consistent manner. The package features a number of computational recipes for efficient calculation of imaging condition and inversion gradient: a dynamic evolving computing box to limit the simulation cube and a well-designed wavefield reconstruction strategy to reduce the memory consumption when dealing with 3D problems. The modelling in SMIwiz runs independently: each shot corresponds to one processor in a bijective manner to maximize the scalability. A batchwise job scheduling strategy is designed to handle large 3D imaging tasks on computer with limited number of cores. The viability of SMIwiz is demonstrated by a number of applications on benchmark models.本研究开源了一款名为SMIwiz的软件，该软件将地震正演模拟、逆时偏移（Reverse Time Migration, RTM）与全波形反演（Full Waveform Inversion, FWI）整合至统一的计算机实现框架中。SMIwiz可通过统一的方式完成二维与三维模拟计算。该软件包集成了多种用于高效计算成像条件与反演梯度的计算方案：包括用于限定模拟计算体范围的动态演化计算框，以及在处理三维问题时可降低内存占用的优化波场重建策略。SMIwiz中的正演模拟支持独立并行运行：每个炮点与单个处理器一一对应，以最大化系统可扩展性。针对核心数有限的计算设备上的大型三维成像任务，该软件设计了批处理作业调度策略。多款基准模型的应用案例验证了SMIwiz的可行性。