多边形断层生长过程和机制
Growth Processes and Mechanism of Polygonal Faults
王锦怡 1孙启良1
作者信息
- 1. 中国地质大学海洋学院,湖北武汉 430074
- 折叠
摘要
多边形断层广泛发育在大陆边缘沉积盆地中,但是目前对于多边形断层的生长过程和机制尚不清楚.本研究基于高精度三维地震资料,刻画了新西兰大南盆地中多边形断层系统的特征,剖析了其生长过程,并建立其生长模式.根据研究区多边形断层的几何特征,新西兰大南盆地中多边形断层可以划分为Tier1和Tier2两个层段.多边形断层落差剖面主要为"C"型、双"C"型和"B"型.结合断层的几何及生长特征,本研究提出了跨层段多边形断层的生长模式:多边形断层首先在下部层段的中心成核,并向各个方向生长;经过一段平静期后,多边形断层在新(上部)层段的中心成核;上覆层段中的多边形断层与下伏层段中的多边形断层逐渐联通,形成中继结构和跨层的"大断层".本研究揭示了多边形断层的生长机制,明确了断层的成核、生长和停止生长等生长过程,相关研究成果能够服务于油气勘探开发及防灾减灾等.
Abstract
Polygonal faults are widely developed in continental sedimentary basins.However,their growth processes and mechanism are still unclear.Based on high-resolution 3D seismic data in the Great South Basin of New Zealand,in this study it focuses on the characteristics,growth processes and growth pattern of polygonal faults.According to the geometric characteristics of polygonal faults,they are divided into two tiers(Tier1 and Tier2).The throw profiles of polygonal faults are"C"type,double"C"type and"B"type.According to the geometric and growth characteristics,it proposes the growth pattern of cross-layer polygonal faults.Polygonal faults initially nucleated at the center of the lower layer(Tier1)and grew in all directions.Following a period of quiescence,polygonal faults nucleated in the center of the new(upper)layer(Tier2).Polygonal faults in the overlying layer were gradually connected with those in the underlying layer,forming the relay zones and a cross-layer"large fault".This study reveals the growth processes of polygonal faults such as nucleation,growth and cessation.The related research results can contribute to the hydrocarbon exploration and development,disaster prevention and mitigation.
关键词
多边形断层/几何特征/生长过程/新西兰/大南盆地/海洋地质/沉积地质Key words
polygonal faults/geometric features/growth process/New Zealand/Great South basin/submarine geology/sedimentology引用本文复制引用
出版年
2024
NETL
NSTL
万方数据