珠江口盆地东北陆架边缘斜坡带晚中新世—第四纪层序模式与单向迁移水道

doi:10.11743/ogg20190415

摘要/Abstract

摘要： 综合二维和三维地震、测井和古生物等资料，在珠江口盆地东北陆架边缘斜坡带晚中新世以来发育的地层中识别出2个二级层序（CS1和CS2）、8个三级层序（S1-S8）以及3种主要的沉积体系：陆架边缘斜坡单向迁移水道、陆架边缘斜坡前积体和陆架边缘三角洲。从外陆架至下斜坡，陆架边缘斜坡单向迁移水道主要由4种水道类型构成：①局部受限的外陆架单向迁移复合水道；②宽浅且非受限或局部受限的外陆架-陆架坡折带侵蚀型水道复合体；③深切且受限的斜坡垂-侧向加积型单向迁移水道；④ U形且非受限或局部受限的下斜坡垂向加积型复合水道体系。根据层序界面、层序内部结构以及沉积体系构成等特征的变化，总结出2种不同的体系域构成模式：①粤海组-万山组由广泛发育的陆架边缘单向迁移水道组成的不同于Exxon经典层序地层的类型；②第四系由高角度陆架边缘前积体充填和斜坡水道组成的层序类型。研究区晚中新世以来的陆架边缘斜坡层序和沉积演化，受到海平面变化、构造运动、沉降速率和沉积物供应等多种控制因素的共同影响。

关键词: 单向迁移水道, 斜坡前积体, 陆架边缘三角洲, 沉积体系, 体系域, 层序, 珠江口盆地

Abstract: Based on the integrated analysis of 3D and 2D seismic, well-logging and paleontological data, two second-order sequences(CS1 and CS2), eight third-order sequences(S1-S8), as well as three main depositional systems(unidirectio-nally-migrating channels in continental slope, shelf margin clinoforms, and shelf-edge deltas) have been recognized in the northeastern shelf edge of the Pearl River Mouth Basin.From outer shelf to lower slope, four types of continental slope channels can be identified:(1) the partly confined outer-shelf unidirectionally migrating composite channels;(2) the broad and shallow outer-shelf to shelf-break erosional composite channels that are unconfined or partly confined;(3) the confined and deeply incised unidirectionally migrating slope channels with vertical and lateral accretion;(4) the U-shaped and unconfined or partly confined vertical accretional composite channels in lower slope.In addition, in view of characteristic variations of sequence boundary, sequence architecture, and depositional system, two types of compositional models of the system tracts have been concluded:(1) the one mainly composed of widespread shelf-margin unidirectio-nally-migrating channels in the Yuehai and Wanshan Formations, which are quite different from the EXXON sequence model;(2) the one that consists dominantly of the Quaternary high-angle shelf margin clinoforms and slope channels.The sequence architecture and depositional evolution in the continental slope in the study area are controlled by a combination of different factors, such as sea level change, tectonism, subsidence rate, and sediment supply.

Key words: unidirectionally-migrating channel, shelf margin clinoform, shelf margin delta, sedimentary system, systems tract, sequence, Pearl River Mouth Basin

中图分类号:

TE121.3

姜静,张忠涛,李浩,等. 珠江口盆地东北陆架边缘斜坡带晚中新世—第四纪层序模式与单向迁移水道[J]. 石油与天然气地质, 2019, 40(4): 864-874. doi: 10.11743/ogg20190415 Jiang Jing,Zhang Zhongtao,Li Hao,et al. Late Miocene to Quaternary sequence architecture and unidirectionally-migrating channels in the northeastern continental slope, Pearl River Mouth Basin[J]. Oil & Gas Geology, 2019, 40(4): 864-874. doi: 10.11743/ogg20190415

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