摘要
Reverse Time Migration(RTM)Surface Ofset Gathers(SOGs)are demonstrated to deliver more superior residual dip information than ray-based approaches.It appears more powerful in complex geological settings,such as salt areas.Still,the computational cost of constructing RTM SOGs is a big challenge in applying it to 3D feld data.To tackle this challenge,we propose a novel method using dips of local events as a guide for RTM gather interpolation.The residual-dip information of the SOGs is created by connecting local events from depth-domain to time-domain via ray tracing.The proposed method is validated by a synthetic experiment and a feld example.It mitigates the computational cost by an order of magnitude while producing comparable results as fully computed RTM SOGs.
基金
This study is jointly supported by the National Key R&D Program of China(2017YFC1500303 and 2020YFA0710604)
the Science Foundation of China University of Petroleum,Beijing(2462019YJRC007 and 2462020YXZZ047)
the Strategic Cooperation Technology Projects of CNPC and CUPB(ZLZX2020-05).
