【摘要】 在我国西部或南方地区的山地、山前带地震勘探中,起伏地表是影响复杂构造成像的重要因素。为此,开展了直接从起伏地表进行波场延拓与成像的波动方程叠前深度偏移方法研究。包括:基于Reshef提出的"逐步一累加延拓"思想,采用带误差补偿的频率一空间域有限差分单程波延拓算子实现单炮记录的波场延拓;基于时间一致性成像原理提取地下反射界面的成像值;利用层析反演技术和剥层技术建立起伏地表深度域层速度场。理论模型和实际资料的偏移结果表明,该方法能够对复杂近地表和复杂地下地质构造很好地成像。更多还原

【Abstract】 During the seismic prospecting in mountainous area or pied- mont zones in western or southern China,rolling surface is the main factor affecting the imaging of complex structures.Aiming at this problem,we studied the wave equation pre-staek depth migra- tion method for wave field continuation and imaging from the undu- lating surface directly.Based on the "add up continuation step by step" concept proposed bY Reshef,finite difference one-way wave continuation operator with error compensation in f-k domain was applied to realize wave field continuation of single shot gather.In addition,reflector interface was extracted in terms of the principle for time consistent imaging.Furthermore,tomography inversion technology and stripping technology were integrated to establish in- terval velocity field of undulating surface in depth domain.The mi- gration results of theory model and real data demonstrates that the method can obtain good imaging results for near surface and sub- surface geologic structures in complex areas.更多还原