【摘要】 本文运用了虚拟偏移距偏移方法实现了各向异性的转换波保幅叠前时间偏移,该方法通过虚拟偏移距直接将原始道集映射为CCSP道集,简化了常规转换波处理的基本流程,所形成的POM道集具有很高的覆盖次数和信噪比,有利于速度分析,尤其适合低信噪比的地震资料。本文通过等效各向异性理论,求取各向异性参数,根据VTI介质的散射旅行时公式推导了各向异性介质的POM方法的虚拟偏移距,通过保幅的POM道集映射、速度分析和叠加等处理,得到各向异性偏移结果。理论模型试算和实际资料处理表明转换波各向异性POM方法保幅叠前时间偏移的有效性。更多还原

【Abstract】 In this paper,we use the method of pseudo-offset migration(POM)to complete converted wave pre-stack time migration with amplitude-preservation in an anisotropic medium.The method maps the original traces into common conversion scatter point (CCSP)gathers directly by POM,which simplifies the conventional processing procedure for converted waves.The POM gather fold and SNR are high,which is favorable for velocity analysis and especially suitable for seismic data with low SNR.We used equivalent anisotropic theory to compute anisotropic parameters.Based on the scattering wave travel- time equation in a VTI medium,the POM pseudo-offset migration in anisotropic media was deduced.By amplitude-preserving POM gather mapping,velocity analysis,stack processing,and so on,the anisotropic migration results were acquired.The forward modeling computation and actual data processing demonstrate the validity of converted wave pre-stack time migration with amplitude-preservation using the anisotropic POM method.更多还原