Migration of generalized random synthesis of seismic data
Chen Shengchang1, Wang Hanchuang1, She Deping2
1. Department of Earth Sciences,Zhejiang University,Hangzhou,Zhejiang 310027,China;
2. Sinopec Geophysical Research Institute,Nanjing,Jiangsu 210014,China
Abstract：Based on the generalized synthesis of seismic data, a one-way wave equation migration method for generalized random synthetic gathers is proposed in this paper, through taking the generalized synthesis function in the generalized synthesis of seismic data as a time random function, and getting generalized random synthetic gathers and generaレ ized random synthetic sources.According to the difference of the coordinates of the source points in these common-shot gathers, we take the genera-ized synthesis function as the random time function related to the coordinates of source points, so that the time delay of sources in the random synthetic gathers have the characteristic of random, avoiding coherent wavefield generated in the synthetic gathers, and guaranteeing the migration effects of random synthetic gathers and the flexibility to subsurface complex structures.The migration processing results from the numerical test and field data show that the migration method introduced in this paper gets the same migration result as that of conventional common-shot migration method, and has high calculation efficiency.
