新西兰Taranaki 盆地第四系深水水道迁移 规律与沉积模式.

Migration rules and depositional model of Quaternary deep-water channel in Taranaki Basin, New Zealand.

In this paper, the Quaternary deep-water channel in Taranaki Basin, New Zealand is the research object. Based on geophysical interpretations of high-quality 3D seismic data, the morphological and migration characteristics of the channel are described, and the migration rules and controlling factors are explored. The findings of this research are as follows. The target channel in the plane is divided into low-sinuous channel (LSC; sinuosity range of 1. 0-1. 2), middle-sinuous channel (MSC; sinuosity range of 1. 2-1. 5), and high-sinuous channel(HSC; sinuosity>1. 5). In different regions, the migration patterns of channel are quite different: the LSC mainly migrates vertically and forms a combination of vertical overlapped channels; the HSC is characterized by lateral migration, and the lateral migration can be finely divided into three types such as dilation migration, sequential migration and barrier retraction migration; and the MSC is dominated by avulsion and diversion migration. The seafloor slope and the restriction of the development environment of the channel are the key factors to control the migration and evolution of the channel. As the seafloor slope flattens and the degree of restriction weakens, the energy of the gravity flow in the channel gradually loses with the increase of the flow distance, and the sinuosity of the channel increases first and then decreases. Three types of deep-water channel depositional models have been established, which are low-sinuous superimposed migration sedimentary model, high-sinuous lateral migration sedimentary model, and middlesinuous avulsion migration sedimentary model. [ABSTRACT FROM AUTHOR]

以新西兰Taranaki 盆地第四系深水水道为研究对象,利用高质量三维地震数据进行地震剖面与地震属性解释, 刻画水道的几何形态学和迁移特征,探索水道迁移规律和相关控制因素。结果表明,平面上目标水道划分为低弯曲 水道(LSC,弯曲度1. 0~1. 2)、中弯曲水道(MSC,弯曲度1. 2~ 1. 5)、高弯曲水道(HSC,弯曲度大于1. 5)3 种类型。 不同区域内水道迁移模式大不相同:低弯曲水道以垂向叠置迁移为主并形成垂向叠置水道组合;高弯曲水道以侧向 迁移为特征,水道侧向迁移方式可细分为扩张迁移、顺流迁移和障积回缩迁移等3 类;中弯曲水道以决口改道迁移为 主。海底坡度是控制水道几何形态和迁移-演化特征的首要内在因素,而水道限制能力是影响水道迁移-演化的直 接因素。随着海底坡度变缓,水道限制能力减弱,水道内重力流能量随流动距离的增加而逐渐衰弱,水道弯曲度表 现为先增后减的特点。建立的深水水道沉积模式包括低弯叠置迁移沉积模式、高弯侧向迁移沉积模式和中弯决口 迁移沉积模式3 种。 [ABSTRACT FROM AUTHOR]

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