【摘要】 为了揭示缝洞储层的地震波场特征 ,首先推导出了允许介质速度有横向变化和纵向变化 ,对地层无倾角限制 ,保振幅 ,并可以避免层间多次波产生的变参考慢度 Rytov近似 Fourier波场延拓算子 ,然后用该算子对根据某地区奥陶系储层溶蚀缝洞的地质特征所设计的二个缝洞模型进行正演和偏移 ,并分析其波场特征。缝洞储层模型数值模拟的结果揭示了在不同情况下 ,单个裂缝、溶洞、缝洞带的宽度和密度的地震波场特征 ,得到了一些有益的结论和认识更多还原

【Abstract】 To reveal the wave field characters of fracture cave reservoir, a Fourier wave field extrapolation operator of variational reference slowness Rytov approximation is derived in this paper. This operator can preserve amplitude and suppress inter bed multiples without restrictions on horizontal and vertical changes of medium velocity and layer dip angle. The operator is then used in the forward modeling and migration on the two fracture cave models built based on the geologic features of the corroded fractures and caves in an Ordovician reservoir and the resulting wave field is analyzed. Some useful conclusions are drawn from numerical simulation of a single fracture, cave, and fracture cave zones of different widths and densities.更多还原