石油物探2025，Vol.64Issue(5)：864-874,11.DOI:10.12431/issn.1000-1441.2024.0163
基于双差约束的大偏移距数据近地表速度建模方法
A double-difference constrained near-surface velocity modeling method for large-offset seismic data
摘要
Abstract
Conventional first-arrival traveltime tomography faces challenges in the computational accuracy and efficiency of traveltime and inversion precision when dealing with large offsets in high-density data.To address these limitations,we propose a near-surface velocity modeling method with double-difference constraints for large offsets.A hybrid approach combining local operators with a global fast scanning method is implemented to solve the eikonal equation,significantly improving the accuracy of first-arrival traveltime calculation for large offsets.Furthermore,double-difference traveltime constraints are incorporated into the iterative inversion to better constrain velocity updates between adjacent rays and reduce error accumulation in large-offset traveltime computation.The test results of model and field data demonstrate the applicability and feasibility of this method in processing large-offset seismic data.关键词
大偏移距数据/初至波/走时层析反演/双差约束/快速扫描法Key words
large-offset data/first arrival/traveltime tomography/double-difference constraint/fast scanning method分类
能源科技引用本文复制引用
张凯,李壮,李振春,杨浩田,郭林杰..基于双差约束的大偏移距数据近地表速度建模方法[J].石油物探,2025,64(5):864-874,11.基金项目
山东省自然科学基金项目(ZR2022MD037)资助. This research is financially supported by the Natural Science Fund Project of Shandong Province(Grant No.ZR2022MD037). （ZR2022MD037）
