北京大学学报（自然科学版）2026，Vol.62Issue(4)：781-793,13.DOI:10.13209/j.0479-8023.2026.031
基于时延叠加的超前探测逆时偏移成像方法
A Reverse Time Migration Imaging Method for Tunnel Ahead Detection Based on Time-Delay Stacking
摘要
Abstract
To address low signal-to-noise ratio of seismic data and poor target visibility in underground engineering applications such as coal mining,hydraulic engineering,and subway construction,we propose a reverse time migration imaging method for tunnel ahead detection based on time-delay stacking.The method designs the relative time delays among the sources in a source array,so that the seismic wavefields generated by the individual sources are aligned in phase along a prescribed direction or at a target point,thereby enhancing coherent signals in reverse time migration imaging.The delays can be implemented physically by controlling the actual source firing times or mathematically by applying corresponding time shifts to independently acquired shot records;the former corresponds to physical implementation,while the latter corresponds to mathematical implementation.Numerical experiments adopting the latter implementation show that compared with the conventional prestack reverse time migration method,the proposed method further improves the signal-to-noise ratio of migration results and enhances diffraction-wave signals,providing a potential approach to tunnel ahead detection imaging under strong-noise conditions.关键词
地下工程/超前探测/时延叠加/逆时偏移/信噪比Key words
underground engineering/tunnel ahead detection/time-delay stacking/reverse time migration/signal-to-noise ratio引用本文复制引用
张东林,温景充,周彤,宁杰远,汪冰玉,汪秋涵..基于时延叠加的超前探测逆时偏移成像方法[J].北京大学学报（自然科学版）,2026,62(4):781-793,13.基金项目
中国石油天然气集团有限公司-北京大学基础研究项目"智能物探的超前基础研究与共享框架"资助 （）
