Research on Joint Imaging of Primaries and Internal Multiples Based on Rtm

Abstract

Summary The existence of internal multiples has brought great influence to seismic data imaging. They are regarded as noise in conventional data processing, which need to be suppressed before imaging. However, the current suppression methods are usually of low accuracy with high costs. Considering that the internal multiples are also real reflections from the interfaces which contain abundant structural information, RTM can handle their imaging but with image artifacts introduced. Therefore, to avoid the high costs in internal multiple suppression and to eliminate the influence of internal multiples in imaging, deep research on the joint imaging of primaries and multiples based on RTM has been done in our manuscript. Firstly, the cause of the image artifacts in joint imaging is analysed. Then, strategies are proposed to solve the image artifacts in joint imaging of primaries and internal multiples. Finally, the feasibility and effectiveness of the proposed method are verified by numerical examples. The proposed method can realize the elimination of image artifacts in the image domain instead of the high-cost suppression of internal multiples in the pre-stack data domain, which has very important practical meaning, the migration of internal multiples may bring potential advantages to the imaging in complex cases.