物探与化探2025，Vol.49Issue(2)：441-450,10.DOI:10.11720/wtyht.2025.1374
三维起伏地形下回折波快速走时层析及其静校正应用
Fast first-arrival traveltime tomography of diving waves under rugged surface and its application to static correction
摘要
Abstract
Ray tracing-based first-arrival traveltime tomography is widely used to construct near-surface velocity models to achieve the static correction of seismic data from complex near surface.However,this method necessitates the calculation of ray paths for first-arrival traveltimes and the iterative updating of initial velocity models.As a result,significant computational time is required when applying this method to measured 3D high-density seismic data.To address this issue,this study proposed a method for quickly building 3D near-sur-face velocity models utilizing diving wave traveltimes under rugged surface.Specifically,based on the ray and traveltime equations of diving waves corresponding to velocities subjected to lateral and vertical changes under rugged surface,the velocity distribution from the observation surface downward was determined using common offset gathers.The proposed method eliminates the need for ray tracing and iterative updates of initial velocity models,offering high modeling efficiency.Tests based on data from theoretical models verified the ef-fectiveness of the proposed method.When applied to measured 3D seismic data,the proposed method yielded static correction results comparable to those obtained using the Fresnel-volume first-arrival traveltime tomography while significantly improving computational ef-ficiency.关键词
回折波/近地表/初至走时/静校正/计算效率Key words
diving wave/near surface/first-arrival traveltime/static correction/computational efficiency分类
天文与地球科学引用本文复制引用
杨华臣,葛大明,王忠成,王磊,袁永祺..三维起伏地形下回折波快速走时层析及其静校正应用[J].物探与化探,2025,49(2):441-450,10.基金项目
中国石化重大科技项目(P24093) （P24093）
