中国石油大学学报（自然科学版）2024，Vol.48Issue(1)：77-90,14.DOI:10.3969/j.issn.1673-5005.2024.01.009
珠江口盆地白云凹陷东部古近系文昌组沉积演化特征
Sedimentary evolution characteristics of Paleogene Wenchang Formation in eastern Baiyun Sag,Pearl River Mouth Basin
摘要
Abstract
This study extensively utilizes new 3D seismic data in conjunction with well log and logging data to investigate the sequence stratigraphy,sedimentary characteristics,and sedimentary evolution of the Wenchang Formation in the Paleogene of Baiyun Sag in the Pearl River Mouth Basin.Additionally,it aims to re-establish the sedimentary system evolution process with-in the third-order sequence framework of the Wenchang Formation.The results reveal that the Wenchang Formation in the east-ern Baiyun Sag can be divided into five third-order sequences from bottom to top,corresponding to three tectonic evolution sta-ges:the initial rifting period(WCSQ1),early detachment rifting period(WCSQ2,WCSQ3)and late detachment rifting period(WCSQ4,WCSQ5).During the initial rifting period,several isolated half-grabens were present,characterized by braided river deltas with axial source in gentle slope,near-source fan deltas in steep slope,and shore-shallow lacustrine sediments.During the early stage of the detachment rifting period,intense faulting activity led to the rapid expansion of the lacustrine basin.Semi-deep lacustrine facies developed in a limited manner,the depositional center shifted northward,and the large braided riv-er delta deposition occurred in the Panyu low uplift in the north.As the late stage of detachment rifting period,fault activity weakened,and the lacustrine basin gradually contracted.The depositional center stabilized in the middle of Baiyun Sag,with the predominant development of small braided river delta deposition and shore-shallow lacustrine facies.Notably,large braided river delta and fan delta sand bodies are identified as favorable reservoirs in the eastern Baiyun Sag.关键词
沉积相/沉积模式/文昌组/白云凹陷/珠江口盆地Key words
sedimentary facies/sedimentary model/Wenchang Formation/Baiyun Sag/Pearl River Mouth Basin分类
能源科技引用本文复制引用
刘太勋,孙丰春,彭光荣,汪旭东,孙辉,解斌,苏兆佳..珠江口盆地白云凹陷东部古近系文昌组沉积演化特征[J].中国石油大学学报（自然科学版）,2024,48(1):77-90,14.基金项目
青岛海洋科学与技术试点国家实验室"十四五"重大项目(2021QNLM020001) （2021QNLM020001）
中海石油(中国)有限公司综合科研项目(KJZH-2021-0003-00) （中国）
