地质学报2025，Vol.99Issue(5)：1523-1537,15.DOI:10.19762/j.cnki.dizhixuebao.2023453
莺歌海盆地一号断层成因机制新认识:来自三维地震资料和砂箱模拟实验的启示
New insight into the mechanism of No.1 fault in the Yinggehai basin:Constraints from three-dimensional seismic data and analogue modelling
摘要
Abstract
The Yinggehai basin has long been of great interest to academics and the petroleum industry due to its special tectonic location(the area of the Red River fault zone into the sea)and its abundant natural gas resources.Since the Indo-Eurasian collision-extrusion model was proposed to explain the deformation in Southeast Asia,the Yinggehai basin has been regarded as a typical pull-apart basin.However,there is a distinct mismatch between these opinions and the structural features revealed by the 3-D(three-dimensional)seismic data.Our study is based on the"generalised fault theory",using 3D seismic data to investigate the structural features of the No.1 fault systematically,and combining it with sandbox simulation experiments,we propose a new insight into the mechanism of the No.1 fault.The results show that the structural features and the distribution of fault distances of the boundary fault(No.1 fault)in the Yinggehai basin are not similar to those of the traditional strike-slip faults.Still,they are also strongly similar to the features of the fault deformation under oblique extension.These faults are oblique-slip normal faults with significant differences in the amount of strike-slip and dip-slip displacements at the various segments,as well as in the control of sedimentary filling of the basin.The boundary fault was an oblique-slip normal fault due to the reactivation of pre-existing structures under a north-south extensional stress regime during the Oligocene-Miocene period,and these insights were also verified by analogue modelling.A new insight into the mechanism of the No.1 fault,which theoretically reveals the mechanism of the Yinggehai basin and can provide guidance for the structural analysis of the Yinggehai basin and its later oil and gas exploration and development.关键词
莺歌海盆地/一号断层/砂箱模拟实验/先存构造/斜向伸展Key words
Yinggehai basin/No.1 fault/analogue modelling/pre-existing structures/oblique extension引用本文复制引用
肖坤泽,童亨茂,杨东辉,李雪松,李绪深,崔浩..莺歌海盆地一号断层成因机制新认识:来自三维地震资料和砂箱模拟实验的启示[J].地质学报,2025,99(5):1523-1537,15.基金项目
本文为国家油气重大专项(编号2016ZX05024-005-004)资助的成果. （编号2016ZX05024-005-004）
