石油物探2025，Vol.64Issue(2)：257-263,7.DOI:10.12431/issn.1000-1441.2023.0437
基于自动倾角约束的逆时偏移
Automatic dip-constrained reverse time migration
摘要
Abstract
Reverse time migration(RTM)based on the two-way wave equation may yield high-precision images of complex subsurface structures.However,RTM is sensitive to the velocity model.This paper proposes a new dip-constrained RTM method.The forward propagating wavefield from the source and backward propagating wavefield from the receiver are decomposed into different directional components,and then an automatic dip-constrained imaging condition is utilized to improve imaging quality in the presence of velocity errors.Meanwhile,our method may mitigate the artifacts caused by non-primary reflections,even when the velocity model is correct,by using the reflection signals within the Fresnel zone.To increase efficiency,we introduce the frequency-domain snapshot to compute the incident angle for source wavefield decomposition.Numerical tests on a complex velocity model show improved imaging in the case of inaccurate velocities and mitigated artifacts caused by multiple reflection waves in the case of the accurate model.关键词
逆时偏移/倾角约束成像条件/速度误差/倾角道集Key words
reverse time migration/dip-constrained imaging condition/velocity error/dip-angle gather分类
天文与地球科学引用本文复制引用
范旭,马军茂,王晨,马凯,李亦航..基于自动倾角约束的逆时偏移[J].石油物探,2025,64(2):257-263,7.基金项目
国家科技重大专项课题(2017ZX05008-007)资助. This research is financially supported by the National Science and Technology Major Project of the Ministry of Science and Technology of China(Grant No.2017ZX05008-007). （2017ZX05008-007）
