Local events-based fast RTM surface-offset gathers via dip-guided interpolation

• 作者: Yang Zhao Feng-Lin Niu Lei Fu Cheng Cheng Jin-Hong Chen Shou-Dong Huo
• 来源期刊: 石油科学（英文版）
• 年，卷（期）: 2021,（3）
• 所属期刊栏目: PETROLEUM GEOLOGY & GEOPHYSICS
• 页码范围: 773-782
• 页数: 10页
• 语种: 英文

摘要

Reverse Time Migration(RTM)Surface Offset 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 field 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 field example.It mitigates the computational cost by an order of magnitude while producing comparable results as fully computed RTM SOGs.