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在三维地震资料叠前偏移中,平面波偏移的成像效果可以等价于共炮点偏移,但计算效率却能成倍提高。此外,保真振幅偏移可以得到地下反射层的相对强度,获得品质更好的地下结构图像,为储层分析提供定量信息。基于这种考虑,针对平面波的保真振幅偏移进行了系统的研究。引人Maslov理论,利用τ-ρ变换将数据从空间(s,r,t)分别变换到(P~s,r,τ)和(s,p~r,τ)及(p~s,p~r,τ)空间中,并将其结合到Born反演中,推导出了相空间偏移算子振幅的高频渐近解。基于Marmousi复杂地质模型的模拟计算结果表明,平面波的保真振幅偏移在合理的计算量条件下可以得到高品质的地下结构图像。
In prestack migration of 3D seismic data, the imaging effect of plane wave offset can be equivalent to common shot offset, but computational efficiency can be doubled. In addition, the fidelity amplitude shift can obtain the relative intensity of the underground reflector and obtain a better quality underground structure image, which can provide quantitative information for reservoir analysis. Based on this consideration, the fidelity amplitude shift of plane wave is studied systematically. The introduction of Maslov theory, the use of τ-ρ transform data from space (s, r, t) were transformed into (P ~ s, r, τ) and (s, p ~ r, τ) and (p ~ s, p ~ r, τ) space and combine them into the Born inversion, the high-frequency asymptotic solution of the amplitude of the phase space shift operator is deduced. The simulation results based on the Marmousi complex geological model show that the fidelity amplitude migration of the plane wave can obtain high quality subsurface structural images under a reasonable amount of computation.