地震波传播和成像中的多尺度计算问题

Multiscale computation problem in seismic wave propagation and imaging

逆时偏移和全波形反演方法的应用对复杂地质条件下的石油勘探具有重要意义,但由于现代地震采集技术的发展,地震勘探数据量迅速增加,逆时偏移和全波形反演方法的技术开发面临如何有效适应大模型和海量数据,缩短计算时间、降低处理成本.为此,本文根据文献调研,评述了科学计算领域的两类方法,多尺度计算的方法和指数映射的方法,指出前者有利于快速计算,后者可以适应非均匀介质,如果将他们结合应用于地震波传播问题,有可能改进逆时偏移和全波形反演方法的并行计算效率.

Application of RTM （reverse time migration） and FWI （full waveform inversion） method has important meaning in oil seismic exploration under complex geological envirement. Quickly increased data volume in seismic exploration due to modem seismic acquisition technology, shortened calculation time, and reduced processing cost, technology development of RTM and FWI method faced many challenge, especially how to fit the requirement of big model and massive data. To that aim, the scientific computing of the two-class methods, multiscale methods of calculating method and exponential map method, are reviewed noting that the former in favour of fast calculation, the later imay adopted to a non-homogeneous medium. Combining with each other for seismic wave propagation problems, it has the potential to improve parallel efficiency of computation in reverse time migration and full waveform inversiorL