摘要
近年来随着复杂构造成像需求的增加,逆时偏移成像成为研究的热点。零延迟互相关成像条件因其成像条件稳定性高,简单易于实现成为应用最为广泛的成像条件,但是该成像条件存在深层照明不足且保幅较差的缺点。归一化互相关成像条件能够很好地修正上述缺点。基于各向同性假设,采用二维声波速度-应力方程进行波场的延拓和重构,推导了交错网格中声波方程的差分格式并给出了稳定性条件。分别采用零延迟互相关成像条件和归一化的互相关成像条件对模型数据进行成像,对不同成像条件得到的偏移剖面进行了分析。
In recent years,with the increasing demand of complex structure imaging,inverse time migration imaging has become a research hotspot.Zero delay cross-correlation imaging condition is the most widely used imaging condition because of its high stability,simple and easy to realize,but the imaging condition has the disadvantages of insufficient deep illumination and poor amplitude preservation.Normalized cross-correlation imaging conditions can correct the above shortcomings.In this paper,based on the isotropy assumption,the two-dimensional acoustic velocity stress equation is used to extend and reconstruct the wave field.The difference scheme of the acoustic equation in the staggered grid is derived and the stability conditions are given.The zero delay cross-correlation imaging condition and the normalized cross-correlation imaging condition are used to image the model data,and the migration profiles obtained under different imaging conditions are analyzed.
作者
吉晓阳
刘文革
Ji Xiao-yang;Liu Wen-ge
出处
《化工设计通讯》
CAS
2019年第12期20-20,37,共2页
Chemical Engineering Design Communications
关键词
逆时偏移
互相关成像条件
声波方程
inverse time migration
cross-correlation imaging conditions
acoustic equation
