摘要
珠江口盆地惠州凹陷古近纪构造演化复杂,源-汇要素多变。基于钻井、地震、铸体薄片、碎屑锆石年龄测试等资料,开展了惠州凹陷源-汇系统及其控储作用研究。研究结果表明:①惠州凹陷古近纪发育低凸起断槽型、内源转换带型和外源转换带型3类源-汇系统。低凸起断槽型源-汇系统母岩以盆内花岗岩基底为主,经同向断槽搬运,发育小型辫状河三角洲;内源转换带型源-汇系统母岩主要为花岗岩基底,经转换带搬运,发育中型辫状河三角洲,受峡湾地形影响,与相邻扇三角洲沉积体偶尔叠置;外源转换带型源-汇系统主要由盆外水系供源,搬运距离较远,仅局部有少量内源混入,发育大型辫状河三角洲。②研究区储层规模与物性受母岩成分、搬运距离、搬运通道形态、沉积相与沉积古地貌共同控制。③研究区发育内源溶蚀型、混源交汇型与低凸起滩坝型3类优质储层,其中外源转换带与盆内低凸起交汇处的混源交汇型储层物性最好。
Paleogene tectonic evolution of Huizhou Sag in Pearl River Mouth Basin is complex,and the sourceto-sink elements are variable.Based on data obtained from drilling,seismic,petrographic thin section,detrital zircon geochronology,the source-to-sink system and its control on reservoir was studied.The results show that:(1)Three types of source-to-sink systems developed in Paleogene of Huizhou Sag:the low uplift fault-trough type,the intra-depression transfer zone type,and the extra-depression transfer zone type.The parent rocks of the low uplift fault-trough type source-to-sink system were mainly the granite basement within the basin,transported through the same-direction fault troughs,and developed small-scale braided river deltas.The parent rocks of the intra-depression transfer zone type source-to-sink system were mainly the granite basement,transported via the transfer zone,and developed medium-scale braided river deltas.Affected by the fjord topography,they occasionally superimposed with the adjacent fan deltas sedimentary bodies.The extra-depression transfer zone type source-to-sink system was mainly sourced from the external water system,with a long transport distance and only a small amount of internal source mixing,developed large-scale braided river deltas.(2)The scale and physical properties of reservoirs in the study area are jointly controlled by parent rock composition,transport distance,transport channel morphology,sedimentary facies,and paleogeomorphology of the sedimentary period.(3)There are three types of high-quality reservoirs:the endogenous dissolution type,the mixed-source convergence type,and the low-uplift beach-bar type.The reservoir physical properties of the mixed-source convergence type at the junction of the exogenous transfer zone and the low uplift within the basin are the best.
作者
严宇洋
熊连桥
何幼斌
陈莹
赵仲祥
刘圣乾
罗进雄
冯斌
YAN Yuyang;XIONG Lianqiao;HE Youbin;CHEN Ying;ZHAO Zhongxiang;LIU Shengqian;LUO Jinxiong;FENG Bin(School of Geosciences,Yangtze University,Wuhan 430100,China;China National Offshore Oil Corporation,Beijing 100028,China;Changqing Branch,China National Logging Corporation,Xi’an 710000,China)
出处
《岩性油气藏》
北大核心
2025年第5期166-177,共12页
Lithologic Reservoirs
基金
国家自然科学基金联合基金项目“南海北部深水区深层温压场差异性演化对优质储层的控制”(编号:U24B2016)
中海石油有限公司科研项目“中国近海盆地潜在富油凹陷资源潜力、成藏机制与突破方向”(编号:YXKY-ZX012021)联合资助。
关键词
源-汇系统
低凸起断槽
内源转换带
外源转换带
辫状河三角洲
文昌组
恩平组
古近系
惠州凹陷
珠江口盆地
source-to-sink system
low uplift fault-trough
intra-depression transfer zone
extra-depression transfer zone
braided river delta
Wenchang Formation
Enping Formation
Paleogene
Huizhou Sag
Pearl River Mouth Basin
