物探化探计算技术2025，Vol.47Issue(5)：641-647,7.DOI:10.12474/wthtjs.20240528-0002
利用小折射互换法探查页岩气区浅表速度
Investigation of shallow velocity in shale gas area using small refraction reciprocal method
摘要
Abstract
Seismic exploration data tend to be affected by the near surface,so it is of great significance for the exploration geophysicists to do a good job in near surface survey,including obtaining near surface lithology and velocity information.As a key area of marine sedimentary distribution in China,the S Basin requires further development in shale gas geophysical exploration.The small refraction method is relatively fast,economical,convenient,and effective.According to the surface geological characteristics of the S Basin,an experiment utilizing the small refraction acquisition method with a hammer source is conducted in the shale gas area,and the data interpretation is attempted using the reciprocal method.In this paper,the basic principle and method of fitting refraction velocity with the reciprocal method are briefly described.Moreover,the field working method and parameters of data acquisition of the encounter interval curve method are introduced.The results show that in the shale gas exploration area,high-quality shallow refraction data can be obtained effectively by using a hammer source excitation,using small offsets,and increasing trace spacing by symmetrical receiving.Based on this,the velocity calculation of discrete extraction points is carried out by using the reciprocal method.The interpretation accuracy is high,and the results are reasonable and reliable,which can provide a reference for well depth design.This paper further discusses the adaptability of the method and the characteristics and requirements for the practical work,which can provide some reference for the application of the method in similar areas.关键词
互换法/小折射法/表层调查/初至拾取/浅表速度Key words
reciprocal method/small refraction method/near-surface survey/firstbreak picking/shallow surface velocity分类
天文与地球科学引用本文复制引用
李广才,李培,张鹏辉,王兴宇,杜恒..利用小折射互换法探查页岩气区浅表速度[J].物探化探计算技术,2025,47(5):641-647,7.基金项目
中国地质调查局项目(DD20243070、DD20230298) （DD20243070、DD20230298）
国家重点研发计划资助项目(2024ZD1002305) （2024ZD1002305）
中国地质科学院基本科研业务费项目(AS2020J03) （AS2020J03）
