石油地球物理勘探2025，Vol.60Issue(2)：446-454,9.DOI:10.13810/j.cnki.issn.1000-7210.20240336
基于地震资料计算断层滑动矢量的四维搜索区域古应力计算方法
Regional paleostress calculation method based on four-dimensional search and fault slip vector calculation with seismic data
杨宇 1吉礼东 2刘芳 3颜平 1徐春阳 4吴昌荣1
作者信息
- 1. 成都理工大学能源学院,四川 成都 610059
- 2. 四川页岩气勘探开发有限责任公司,四川 内江 641000
- 3. 北京石油管理干部学院,北京昌平 100096
- 4. 辽河油田勘探开发研究院,辽宁 盘锦 124010
- 折叠
摘要
Abstract
Since regional paleostress controls the development of faults and fractures,an accurate understanding of regional paleostress is of great significance for oil and gas exploration and development.Based on the Wallace-Bott hypothesis,fault slip vectors combined with the four-dimensional search method can be used to accurately calculate regional paleostress.At present,the slip vectors of a fault are generally represented by the fault slip data of the surface outcrop.However,there are differences between the underground stress state and the sur-face stress state reflected by the fault slip data.Therefore,a new method is introduced to calculate the fault slip vectors directly with 3D seismic data.First,a vertical or horizontal seismic profile is constructed,and the ap-parent strike slip and apparent oblique slip are read.The fault slip vectors are calculated by the mathematical method.Then,the four-dimensional search method is used to calculate the regional paleostress.Taking the M block of the gas reservoir from the 2nd member of Xujiahe Formation in Xinchang Gasfield as an example,this study calculates 18 fault slip vectors of two faults and randomly divides them into 5 groups.After that,it calcu-lates the regional paleostress of each group by using the four-dimensional search method and evaluates the devia-tion(RUP value)between the shear stress direction of the regional paleostress tensor on the cross section and the actual fault slip direction.The results show that the average RUP values of the five schemes are less than 50%,which indicates that the method is accurate in calculating regional paleostress and can be applied to simi-lar areas.关键词
地震资料/断层滑动矢量/古应力反演/四维搜索法Key words
seismic data/fault slip vector/paleostress inversion/four-dimensional search method分类
天文与地球科学引用本文复制引用
杨宇,吉礼东,刘芳,颜平,徐春阳,吴昌荣..基于地震资料计算断层滑动矢量的四维搜索区域古应力计算方法[J].石油地球物理勘探,2025,60(2):446-454,9.
