| 珠江口盆地阳江东凹裂陷期沉积环境及其构造控制 |
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| 引用本文： | 杨悦,彭光荣,朱定伟,索艳慧,占华旺,刘泽,李玺瑶,周洁,王光增,刘博,郭玲莉,李三忠.珠江口盆地阳江东凹裂陷期沉积环境及其构造控制[J].大地构造与成矿学,2021,45(1):79-89. |
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| 作者姓名： | 杨悦 彭光荣 朱定伟 索艳慧 占华旺 刘泽 李玺瑶 周洁 王光增 刘博 郭玲莉 李三忠 |
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| 作者单位： | 深海圈层与地球系统教育部前沿科学中心,海底科学与探测技术教育部重点实验室,中国海洋大学 海洋地球科学学院,山东 青岛 266100;青岛海洋科学与技术国家实验室 海洋矿产资源评价与探测技术功能实验室,山东 青岛 266100;中海石油(中国)有限公司 深圳分公司,广东 深圳 518000 |
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| 基金项目： | 泰山学者项目对李三忠和刘永江教授的资助以及青岛创新领军人才项目;国家科技重大专项;国家自然科学基金项目 |
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| 摘 要： | 珠江口盆地阳江东凹形成于古近纪裂陷期,广泛发育烃源岩的富存层段——文昌组、恩平组,具有陆相断陷盆地沉积以及构造控制下多幕演化的特征。沉积环境演变以及构造-沉积的耦合作用是陆相断陷盆地的重要研究方向,认识其动态过程可为烃源岩识别和油气评价建立基础。本文从三维地震资料、钻井资料入手,通过地震反射特征和井震联合分析,划分了研究区的层序地层格架,识别出文昌组、恩平组的地震相类型。根据地震相类型和岩性资料,认为裂陷期文昌组、恩平组发育7种沉积相,洼陷中心发育半深湖相、滨浅湖相、湖底扇相,洼陷边缘在不同时期因构造、物源的影响,不同程度地发育扇三角洲相、辫状河三角洲相、近岸水下扇相、滩坝相,构成完整的沉积体系。沉积期间,构造活动尤其是控洼断裂的活动对沉积产生重要的影响,总体分为初始裂陷阶段、强烈裂陷阶段、裂陷萎缩阶段三个阶段的演化,由此,阳江东凹为该三个阶段演化的产物。
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| 关 键 词： | 珠江口盆地 文昌组 恩平组 地震相 沉积环境 控洼断裂 |
Syn-rifting Sedimentary Environment and its Tectonic Control in the Eastern Yangjiang Sag of the Pearl River Mouth Basin |
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| YANG Yue,PENG Guangrong,ZHU Dingwei,SUO Yanhui,ZHAN Huawang,LIU Ze,LI Xiyao,ZHOU Jie,WANG Guangzeng,LIU Bo,GUO Lingli,LI Sanzhong.Syn-rifting Sedimentary Environment and its Tectonic Control in the Eastern Yangjiang Sag of the Pearl River Mouth Basin[J].Geotectonica et Metallogenia,2021,45(1):79-89. |
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| Authors: | YANG Yue PENG Guangrong ZHU Dingwei SUO Yanhui ZHAN Huawang LIU Ze LI Xiyao ZHOU Jie WANG Guangzeng LIU Bo GUO Lingli LI Sanzhong |
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| Institution: | (Frontiers Science Center for Deep Ocean Multispheres and Earth System,Key Lab of Submarine Geosciences and Prospecting Techniques,MOE and College of Marine Geosciences,Ocean University of China,Qingdao 266100,Shandong,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266100,Shandong,China;Shenzhen Branch,CNOOC China Limited,Shenzhen 518000,Guangdong,China) |
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| Abstract: | The widespread source rocks of the Wenchang and Enping Formations in the eastern Yangjiang Sag of the Pearl River Mouth Basin were deposited in a faulted lacustrine basin during the Paleogene rifting period,and are characterized by multi-stage structure controlled sedimentation.Evolution of sedimentary environment and coupling of tectonics and sedimentation are important factors to decipher the dynamic processes of a faulted basin and helpful for source rock identification and hydrocarbon evaluation.The stratigraphic sequences in the study area were divided and the seismic facies types of the Wenchang and Enping Formations were identified based on 3D seismic reflection data and drilling data.According to the seismic facies types and lithology,seven syn-rifting sedimentary facies that constitute a complete sedimentary system have been recognized in the Wenchang and Enping Formations,which include the semi-deep lacustrine facies and offshore shallow lacustrine facies developed in the center of the sub-sag,and fan delta,braided river delta,near-shore sub-lacustrine fan and lake beach bar developed in the edge of the sub-sag.The tectonic activities,especially those of the sub-sag-controlling faults,influenced the sedimentation significantly.The tectonic evolution of the eastern Yangjiang Sag can be divided into three stages,including initial,intensive and weak rifting. |
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| Keywords: | Pearl River Mouth Basin Wenchang Formation Enping Formation seismic facies sedimentary environment sub-sag-controlling faults |
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