CT理论与应用研究2025，Vol.34Issue(6)：1029-1038,10.DOI:10.15953/j.ctta.2025.190
倾角域稳相黏弹性叠前时间偏移
Deabsorption Prestack Time Migration Combining Stationary-phase Method in Dip-angle Domain:A Case Study of Seismic Data from the Ganquan Block in the Ordos Basin
摘要
Abstract
The Ganquan Loess Plateau Block in the Ordos Basin exhibits promising hydrocarbon exploration potential in its karst reservoirs.However,the seismic imaging quality obtained using conventional methods remains suboptimal due to challenges posed by thick loess layers and complex karst reservoir structures.This paper proposes a dip-angle domain stationary-phase deabsorption prestack time migration method to enhance imaging quality in this area.By incorporating the effective Q concept,the method compensates for seismic wave energy attenuation and wavelet dispersion caused by medium absorption,significantly improving imaging resolution.Nevertheless,high-frequency energy compensation inevitably amplifies migration noise.The dip-angle domain stationary-phase migration estimates the Fresnel zone based on dip-angle gathers,achieving optimal Fresnel zone stacking imaging in the dip-angle domain,which effectively suppresses migration noise and substantially enhances the signal-to-noise ratio(SNR)of the imaging section.The proposed method integrates the dual advantages of dip-angle domain stationary-phase migration(improving SNR)and viscoelastic prestack time migration(enhancing resolution).After applying this method to the Ganquan Loess Plateau Block,both the SNR and resolution of imaging profiles were markedly improved,with the typical"beaded"structures in karst reservoirs clearly imaged.关键词
稳相偏移/黏弹性偏移/倾角道集/菲涅耳带/黄土塬Key words
stationary-phase migration/deabsorption migration/dip-angle gather/Fresnel zone/Loess Plateau分类
天文与地球科学引用本文复制引用
王振川,李跃东,姜磊,折印楠,刘志伟,邓世广,李正伟,荣文征..倾角域稳相黏弹性叠前时间偏移[J].CT理论与应用研究,2025,34(6):1029-1038,10.基金项目
陕西延长石油(集团)有限责任公司气田公司委托项目(AH2023-0560) （集团）
中国地质科学院基本科研业务费专项经费(JKY202510 （）
JKY202407). （）
