Research On Surface Multiple Migration Imaging Of Seismic Data

With the deepening of exploration,complex geological structures have gradually become an important target for searching for underground oil and gas reservoirs.In the face of salt dome high-speed body and steep dip structures,the traditional reflection wave migration imaging results are often unsatisfactory.Compared with the primary,multiple has a longer propagation path and can provide additional illumination coverage.If multiple information can be used,the results of multiple imaging will be an effective supplement to reflected wave imaging,and then high-precision imaging of complex underground structures can be realized.This article focuses on the surface-related multiple migration imaging of seismic data.High-order finite-difference numerical methods are used to simulate data containing surfacerelated multiple and primary,providing high-precision seismic data for algorithm testing.Based on the feedback iterative model,the surface-related multiple elimination technology(SRME)is used to predict multiples,and then the surface multiples can be better separated from the seismic data;By studying the principle of multiples migration imaging,based on the surfacerelated multiple reverse time migration method,in order to solve the problem of noise caused by high and low-order multiples crosstalk,separating surface-related multiples into different orders.Realize different order multiples reverse time migration imaging calculation.At the same time,the method of separating upward and downward traveling waves is used to suppress the problems of low frequency noise and false imaging when the velocity changes greatly,which effectively improves the resolution of shallow structure imaging.Aiming at the calculation of multiple migration,the multiple migration imaging method based on the oneway wave theory is derived from the PSPI theory.The autocorrelation of the data can reduce the amount of calculation,effectively improve the calculation efficiency,and still have a good imaging effect for complex geological conditions.The numerical experimental results show that the surface-related multiples can be treated as effective information and the migration imaging processing can increase the illumination range and get an excellent imaging effect.By using different order multiple reverse-time migration imaging,low frequency noise can be suppressed effectively,false imaging can be avoided effectively,and realize high-precision imaging of complex structures.