共反射面元叠加技术及其在偏移成像中的应用

College of Geo-resources and Information, China University of Petroleum, Dongying 257061, China

（中国石油大学（华东）地球资源与信息学院，山东东营257061）

Sun Xiaodong, Li Zhenchun, Teng Houhua, Li Fang

共反射面元（CRS）叠加技术通过描述本征波波前的运动学参数来生成叠加算子，能够提高叠后数据的信噪比，改善深层反射成像的质量。但对CRS叠后数据的偏移处理，往往不能取得满意的效果。为此，对CRS常规流程进行了改进，借助于CRS运动学参数同时实现数据的叠加和偏移。由于CRS参数剖面与成像射线相对应，因此有助于速度模型的建立和偏移孔径的估算。模型数据试算结果表明：由改进的CRS流程得到的参数谱质量更高，相干剖面上的同相轴连续性更好。因此，利用改进后的CRS流程进行参数分析可以得到更好的成像结果。

The stacking operator of common-reflection-surface (CRS) stacking generated by kinematic parameters of wavefront in principal wave can enhance the S/N of post-stack data and improve the imaging quality of deep reflection. However, good result can not be obtained by the successive post stack time migration based on CRS stack data. Therefore, CRS workflow is modified so that stacking and migration can be realized simultaneously taking advantage of CRS kinematic parameters. The CRS parameter sections are corresponding to the imaging rays, which is beneficial to establish velocity model and to calculate migration aperture. Test on model data shows that the parameter spectra obtained by modified CRS workflow has a higher quality and event continuity in coherence section also appear better. Therefore, it will get better imaging result to perform parameter analysis based on the modified CRS workflow.