地学前缘 ›› 2025, Vol. 32 ›› Issue (4): 422-443.DOI: 10.13745/j.esf.sf.2024.5.26

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珠江口盆地云开低凸起形成演化及构造分区作用

秦阳1(), 刘池洋1,*(), 彭光荣2, 黄雷1, 李洪博2, 梁超1, 吴哲2, 杨丽华1   

  1. 1.西北大学 大陆动力学国家重点实验室, 地质学系, 陕西 西安 710069
    2.中国海洋石油深圳分公司, 广东 深圳 518054
  • 收稿日期:2024-01-31 修回日期:2024-04-15 出版日期:2025-07-25 发布日期:2025-08-04
  • 通信作者: *刘池洋(1953—),男,教授,博士生导师,主要从事油气地质、能源地质和盆地动力学等方面的科研与教学工作。E-mail: lcy@nwu.edu.cn
  • 作者简介:秦 阳(1998—),男,博士研究生,主要从事盆地油气地质与构造解析等方面的研究。E-mail: yangqin202021427@163.com
  • 基金资助:
    国家自然科学基金项目(42230815);国家自然科学基金项目(42272148);国家自然科学基金项目(42202124);西北大学大陆动力学国家重点实验室科学技术部专项(201210142)

Formation and evolution of the Yunkai low uplift in the Pearl River Mouth Basin and its structural partition effects

QIN Yang1(), LIU Chiyang1,*(), PENG Guangrong2, HUANG Lei1, LI Hongbo2, LIANG Chao1, WU Zhe2, YANG Lihua1   

  1. 1. State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi’an 710069, China
    2. Shenzhen Branch, China National Offshore Oil Corporation, Shenzhen 518054, China
  • Received:2024-01-31 Revised:2024-04-15 Online:2025-07-25 Published:2025-08-04

摘要:

云开低凸起位处两个富烃凹陷之间,油气勘探前景好,且其在理解珠江口盆地东、西部差异演化研究中具有重要地位。本文以深度域3D地震资料为基础,结合生长地层特征、构造演化剖面和沉降史模拟结果,重点论述了低凸起的地质结构构造、断裂特征和构造演化过程,分析了构造演化动力环境及其构造分区作用。云开低凸起由北至南可分为3段,各地段结构形态不同,不同地段间及其与洼陷间多以断裂接触。生长地层特征分析及低凸起与两侧洼陷的隆-降响应特性模拟结果揭示云开低凸起不同部位的隆升速率存在时空差异。新生代裂陷期与裂后期断裂的几何学和运动学特征有别,且由早至晚断裂走向发生顺时针旋转。基底内幕可识别出具有挤压或压扭性质的两期晚中生代断裂体系,其对新生代断裂具有明显制约作用。整体上,低凸起晚中生代经历了晚侏罗世—早白垩世NW向和晚白垩世早—中期近SN向的两期挤压变形。新生代经历了始新世的快速隆升、晚始新世—早中新世的缓慢隆升和中新世至今的整体沉积-沉降深埋3个主要形成阶段。综合分析认为,云开低凸起作为两侧凹陷间的构造转换带,在位置上与NW向阳江—一统暗沙断裂带南段深浅叠置,调节凹陷差异构造变形及盆地差异演化。云开低凸起所在的NW向构造转换带具有重要的深部动力学背景,该特性造成盆地新生代NE向优势构造的分区。

关键词: 构造特征, 形成演化, 构造分区, 云开低凸起, 珠江口盆地

Abstract:

The Yunkai low uplift is located between two hydrocarbon-rich depressions, with good prospects for oil and gas exploration. It plays a critical role in understanding the differential evolution of the eastern and western Pearl River Mouth Basin. Based on 3D seismic data in the depth domain, this paper focused on the geological structures, fault characteristics and tectonic evolution process of the Yunkai low uplift by combining the characteristics of the growth strata, the results of tectonic evolution profiles and simulations of the subsidence history, as well as analysing the dynamic environment of the tectonic evolution and tectonic zoning role of low uplift. The Yunkai low uplift can be divided into three sections from north to south, with different structural patterns in each section, and the contacts between different sections and between them and depressions are mostly faults. The results of the growth strata characteristics analysis and the simulation of the uplift-descent response features of the low uplift and the depressions on both sides reveal that there are spatial and temporal variations in the uplift rate at different sections of the Yunkai low uplift. The geometric and kinematic characteristics of the faults in the Cenozoic rifting and post-rifting stages are different, and the fault strikes undergo clockwise rotation from early to late. Two-stage late Mesozoic fault systems with extrusion or compression-torsion properties can be identified within the basement and have significantly constrained the Cenozoic faults. Overall, the low uplift experienced two stages of extrusion deformation in the Late Jurassic-Early Cretaceous NW and early-middle Late Cretaceous near-SN directions during the late Mesozoic. It experienced three major formation stages in the Cenozoic: a rapid uplift stage during the Eocene, a slow uplift stage during the Late Eocene-Early Miocene, and a whole sedimentation-subsidence and deep burial stage from the Miocene to the present. Comprehensive analyses suggest that the Yunkai Low uplift, as a tectonic transition zone between the depressions on both sides, is deeply and shallowly superimposed on the southern section of the NW-trending Yangjiang-Yitong Ansha fault zone, which regulates the differential structural deformation of the depressions and the differential evolution of the basin. The NW-trending structural transition zone in which the Yunkai low uplift is situated has a significant deep dynamic setting, and this property results in the partitioning of the dominant Cenozoic NE-trending structures in the basin.

Key words: structural characteristics, formation and evolution, structural partition, Yunkai low uplift, Pearl River Mouth Basin

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