珠江口盆地白云凹陷碎屑岩—碳酸盐岩混源型深水峡谷体系特征与控制因素  

Characteristics and Controlling Factors of a Mixed-source Deep-water Canyon System of Clastic and Carbonate Rocks in the Baiyun Depression,Pearl River Mouth Basin

作　　者：柳保军 张向涛 颜晖 吴宇翔 谢世文 石宁 陈淑慧 向绪洪 LIU Baojun;ZHANG Xiangtao;YAN Hui;WU Yuxiang;XIE Shiwen;SHI Ning;CHEN Shuhui;XIANG Xuhong(China National Offshore Oil Corporation Deepwater Development Ltd.,Shenzhen Guangdong 518054,China;Shenzhen Brach of China National Offshore Oil Corporation China Ltd.,Shenzhen Guangdong 518054,China)

机构地区：[1]中海石油深海开发有限公司,广东深圳518054 [2]中海石油(中国)有限公司深圳分公司,广东深圳518054

出　　处：《地球科学进展》2024年第5期532-548,共17页Advances in Earth Science

基　　金：国家重大科技专项(编号:2016ZX05026-003-003);中海石油深海开发有限公司承担“十四五”重大科技项目(编号:KJGG2022-0102)资助。

摘　　要：珠江口盆地白云凹陷中新世珠江组SQ21.0层序发育与混源型深水峡谷体系有关的规模深水扇砂岩岩性油气藏。基于钻井约束下的三维高精度层序地层分析,系统解剖白云凹陷中新世SQ21.0层序碎屑岩—碳酸盐岩混源型深水峡谷体系的形态、充填演化与主控因素。研究显示该混源型深水峡谷体系自陆架坡折带向南部陆坡延伸超150 km,呈SN向展布于白云凹陷东区;该峡谷体系呈现上陆坡峡谷体系头部、中陆坡白云东洼区和下陆坡云荔低隆起—荔湾凹陷区等三段式发育特征,剖面形态由上陆坡的“V”型演变为中下陆坡的“U”型—“W”型,平面上由多条发散状峡谷水道演变为一条大型深水峡谷体系。受古珠江三角洲—东沙陆隆起台地双物源演化、相对海平面变化、陆架坡折和限制性陆坡地貌等共同控制,在强制海退期—低位期发育古珠江三角洲和东沙隆起滨岸体系供源的富砂型峡谷水道体系,而在相对海平面上升的海侵期—高位期发育大规模泥质/碳酸盐岩台地供源的峡谷水道体系,强烈下切侵蚀出现在限制性强的陡坡区,充填物相对富泥或富灰质。近SN向分布的泥/灰质水道峡谷体系切过近EW向展布的鼻状构造带和下覆早期富砂深水扇体形成大规模的岩性圈闭群,为近期深水区岩性圈闭勘探的重点突破领域。The Miocene SQ21.0 sequence of the Zhujiang Formation in the Baiyun Depression,Pearl River Mouth Basin,developed large-scale deep-water fan sandstone stratigraphic reservoirs related to a mixed-source deep-water canyon system.Based on the 3-dimensional high-resolution sequence stratigraphy method constrained by drilling data,this study details the morphology,filling evolution,and main controlling factors of a mixed-source deep-water canyon system of clastic and carbonate rocks in the SQ21.0 sequence during the Miocene in the Baiyun Depression,Pearl River Mouth Basin.Our findings show that the mixed-source canyon system extends>150 km from the continental shelf break to the southern slope and is distributed in a SN direction in the eastern area of the Baiyun Depression,which presents a characteristic three-segment pattern,such as the head of the upper slope canyon system,Baiyun East Depression on the middle slope,and Yunli Low Uplift Liwan Depression on the lower slope.The profile topology has evolved from a V-shaped upper slope to a U-W-shaped middle and lower slope,and in the plane,it has evolved from multiple divergent canyons into a large canyon system.The development and distribution of the mixed-source canyon system of the Zhujiang Formation were controlled by the evolution of the dual source of the Paleo-Pearl River Delta-Dongsha Uplift platform,relative sea-level changes,shelf breaks,and restricted slope landforms.During the early forced regression of relative sea-level decline,a sand-rich canyon channel system supplied by the coastline system of the Paleo-Pearl River Delta and Dongsha Uplift developed,with significant erosion to the shelf-break-outer shelf and restricted slope change areas.Conversely,during transgression to the highstand period of relative sea level rise,with the retreat of the Paleo-Pearl River Delta source and rapid growth of reefs on the Dongsha Uplift platform,a large-scale canyon channel system supplied by argillaceous/carbonate detritus developed,with intense incision erosion occurr

关 键 词：白云凹陷 混源型深水峡谷体系 陆坡限制性地貌 古珠江三角洲 碳酸盐岩台地 

分 类 号：P618.13[天文地球—矿床学]