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古地理学报 ›› 2025, Vol. 27 ›› Issue (6): 1400-1419. doi: 10.7605/gdlxb.2025.098

• 岩相古地理及沉积学 • 上一篇    下一篇

珠江口盆地珠三坳陷中部珠江组沉积特征及主控因素*

孙连浦()   

  1. 中国石油化工股份有限公司石油勘探开发研究院, 北京 102206
  • 收稿日期:2025-01-19 修回日期:2025-06-15 出版日期:2025-12-01 发布日期:2025-11-25
  • 作者简介:

    孙连浦,男,1970年生,博士,主要从事油气综合研究与区带评价。E-mail:

  • 基金资助:
    *国家重大科技专项(2017ZX05001-002-002); 国家自然科学基金项目(41202078)

Sedimentary characteristics and controlling factors of the Neogene Zhujiang Formation in central Zhu-3 Depression, Pearl River Mouth Basin

SUN Lianpu()   

  1. Petroleum Exploration and Production Research Institute, Sinopec, Beijing 102206, China
  • Received:2025-01-19 Revised:2025-06-15 Online:2025-12-01 Published:2025-11-25
  • About author:

    SUN Lianpu,born in 1970,Doctor of marine geology,is mainly engaged in study on oil & gas comprehensive and play evaluation. E-mail: .

  • Supported by:
    Co-funded by the subproject of National Science and Technology Major Projects of China(2017ZX05001-002-002); National Natural Science Foundation of China(41202078)

摘要:

珠三坳陷是南海北部大陆架主要产油区之一,但勘探程度低,还存在物源方向不清晰、沉积相展布范围不明确等问题。本研究利用岩心、钻测井、地震资料,以及粒度、重矿物等分析化验资料,完成了珠江口盆地珠三坳陷中部珠江组沉积体系研究。研究认为,研究区珠江组主要发育潮控河口湾、曲流河三角洲、扇三角洲、滨岸和浅海陆棚相5种沉积相类型。研究区主要物源来自西北部和东北部,次要物源来自于东南部神狐隆起。沉积早期,东南部发育扇三角洲,西北部半封闭环境发育潮控河口湾沉积; 随着从南向北的海侵作用逐渐加强,神狐隆起消失,西北部发育大规模的河控曲流河三角洲,整体经历了海侵的过程。在潮控及河控沉积特征对比的基础上,总结了沉积模式,并指出物源供给、相对海平面变化及古地貌为沉积主控因素。

关键词: 物源, 沉积体系, 沉积模式, 主控因素, 珠江组, 珠三坳陷, 珠江口盆地

Abstract:

The Zhu-3 Depression is one of the main oil producing areas on the northern continental shelf of the South China Sea,but the exploration level is low,and issues such as unclear sediment source directions and ambiguous distribution ranges of sedimentary facies still exist. This study utilized core,drilling and logging,seismic data,as well as grain size and heavy mineral analysis data,to investigate the sedimentary system of the Zhujiang Formation in the central Zhu-3 Depression of the Pearl River Mouth Basin. The study identified five types of sedimentary facies,including tidal controlled estuary,meandering river delta,fan delta,shore and shallow sea shelf facies.The main sediment sources in the study area are from the northwest and northeast,while the secondary source is from the Shenhu Uplift in the southeast. During the early stages of sedimentation,fan deltas developed in the southeast,and tide-controlled estuary bay deposits formed in the semi-enclosed environment of the northwest. As the transgression from south to north gradually intensified,the Shenhu Uplift disappeared,and large-scale river-controlled meandering river deltas developed in the northwest,with the entire area experiencing a transgression process. Based on the comparison of tidal-controlled and fluvial-controlled sedimentary characteristics,the study summarized the sedimentary model and identified sediment supply,relative sea-level changes,and paleogeography as the main controlling factors of sedimentation.

Key words: provenance, depositional system, depositional model, main controlling factors, Zhujiang Formation, Zhu-3 Depression, Pearl River Mouth Basin

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