Robust incident-angle field estimation:a one-way wave propagator approach
作者单位：Institute of Geology and GeophysicsKey Laboratory of Petroleum Resources ResearchChinese Academy of Sciences
会议名称：《中国科学院地质与地球物理研究所2013年度（第13届）学术年会》
会议日期：2014年
学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程]
基 金：the National Natural Science Fund of China(Grant No. 41174112) theNational Major Project of China(Grant Nos 2011ZX05008- 006 and 2011ZX05023-005) the China Postdoctoral Science Foundation (Grant No.2013T60167)which supported this work
关 键 词：incident angle one-way wave extrapolation ray tracing seismic wave propagation
摘 要：The incident angle is a very important piece of information in many processing steps for seismic data,but it cannot be easily and directly estimated in many typical and familiar migration processes,such as shot-profile wave equation migration and reverse time *** this paper,we first revisit and analyse some popular schemes of estimating the incident-angle *** we present a robust method to estimate the incident-angle field in a 2D/3D heterogeneous isotropic media based on a one-way wave *** the band-limited wavefield,the incident-angle field is estimated by the division of two impulse responses of the monochromatic wavefield in order to reduce *** impulse responses are the derivative of the angle-weighted image extracted by multiplying an extra imaging weight in the conventional migration process and conventional *** tilted coordinate system is adopted in our method to avoid the steep-angle limitation of one-way wave *** comparison with other methods,our method can estimate the incident-angle field more accurately with higher efficiency and less memory *** incident-angle fields of a 2D layered model and 3D field data example demonstrate the generality and flexibility of the method.