海相油气地质2025，Vol.30Issue(6)：586-598,13.DOI:10.3969/j.issn.1672-9854.2025.06.005
珠江口盆地惠州凹陷西南部文昌组优质烃源岩特征及发育的主控因素
Characteristics and main controlling factors of high-quality source rocks of Wenchang Formation in the southwestern Huizhou Sag,Pearl River Mouth Basin
摘要
Abstract
It has been proved that 100-million-ton class oilfield cluster in southwestern Huizhou Sag has an important relationship with the development of high-quality source rocks in Wenchang Formation.The controlling factors of high-quality source rocks in southwest area of Huizhou Sag are not clear enough,which is not conducive to guide the petroleum exploration of peripheral sags.Based on the difference analysis of organic geochemical characteristics of high-quality source rocks,the controlling factors for the development of high-quality source rocks in southwestern Huizhou Sag are studied from the aspects of structure,sedimentation,organic matter sources and preservation conditions.The results show that:(1)The scale and distribution of high-quality source rocks in southwestern Huizhou Sag are controlled by tectonic activities and source supply,especially,during the depositional period,a relatively large fault throw and a low source-to-sink ratio are conducive to the development of high-quality source rocks.The tectonic activity controlled the migration of the subsidence center and sedimentation center from south to north,with HZ26 sub-sag in the early stage and XJ24 sub-sag in the late stage as the central area respectively.(2)The quality of high-quality source rocks depends on the source of organic matter and preservation conditions.The aquatic algal dominance,brackish water-fresh water and hypoxic reduction preservation conditions during Wenchang Member 4 period are more conducive to the development of high-quality source rocks.(3)Strong fault activity,limited distribution of sedimentary sand bodies,input of oil-prone aquatic-terrestrial organic matter,brackish water and strong anoxic environment are important controlling factors for the development of high-quality source rocks in HZ26 sub-sag.This study helps to further understand the potential of source rocks in peripheral sub-sags,and provide important support for the exploration of potential hydrocarbon-rich sags.关键词
烃源岩/构造演化/沉积充填/文昌组/惠州凹陷/珠江口盆地Key words
source rock/tectonic activity/sedimentary filling/Wenchang Formation/Huizhou Sag/Pearl River Mouth Basin分类
能源科技引用本文复制引用
刘培,李洪博,罗明,王宇辰,刘汉卿,宋朋霖,徐进军,刘太勋,李理..珠江口盆地惠州凹陷西南部文昌组优质烃源岩特征及发育的主控因素[J].海相油气地质,2025,30(6):586-598,13.基金项目
本文受青岛海洋科学与技术试点国家实验室"十四五"重大项目"海洋深水深层油气资源高效探测与智能评价技术"(编号:2021QNLM020001)和中海油深圳分公司生产性科研项目"西江23洼构造沉积特征及有利烃源展布研究"(编号:SCKY-2024-SZ-06)联合资助 （编号:2021QNLM020001）
