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| Research on the regularization method for seismic data in shot domain |
| Lu XU |
| SINOPEC Geophysical Research Institute,Nanjing 211103,China |
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Abstract Reverse time migration based on two-way wave equation is an effective method to deal with steeply dipping structures and complicated velocity models.As a method of wave equation migration,the data required to be input are regularly sampled shot gathers.However,the field acquisition is limited by complex geological conditions and the actual seismic data are usually irregularly and sparsely sampled along the spatial direction,and there is a serious spatial aliasing phenomenon,which affects the accuracy of migration.In this paper,the prestack seismic data regularization technique is proposed for reverse time migration,which is based on the correlation of data in the OVT (Offset Vector Tile) domain to realize the iterative anti-aliasing interpolation for the full wave number band of data.It has the advantages of spectral anti-leakage,anti-aliasing and anti-noise.By mapping the coordinates of the shot gathers from the geometric system,the regularized shot gathers are obtained from OVT domain interpolation results,and applied to the reverse time migration.The application results of real data show that the technology can effectively improve the precision of reverse time migration while saving the cost of acquisition.
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Received: 29 January 2018
Published: 19 December 2018
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