| 珠江口盆地阳江东凹古近系构造特征与勘探潜力 |
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| 引用本文： | 梁卫,彭光荣,朱定伟,吴静,杜晓东,蔡国富,汪晓萌,何金海,李三忠,索艳慧.珠江口盆地阳江东凹古近系构造特征与勘探潜力[J].大地构造与成矿学,2021,45(1):168-178. |
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| 作者姓名： | 梁卫 彭光荣 朱定伟 吴静 杜晓东 蔡国富 汪晓萌 何金海 李三忠 索艳慧 |
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| 作者单位： | 中海石油(中国)有限公司 深圳分公司,广东 深圳 518000;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 |
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| 基金项目： | 中海石油(中国)有限公司深圳分公司科研项目;"十三五"国家科技重大专项 |
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| 摘 要： | 阳江东凹是近年来珠江口盆地(东部)的热点探区,过去四十余年受限于钻井数量与地震资料品质和覆盖范围,缺少对古近系的研究。随着勘探程度的提高,走向深层古近系是珠江口盆地油气勘探的必然趋势。本文在覆盖全区的高品质三维地震资料基础上,结合新近钻井和测井资料,系统解剖阳江东凹的构造特征及其对沉积充填的控制,并探讨古近系的勘探潜力。阳江东凹发育5个次级洼陷,古近纪控洼断裂频繁转换,断裂活动、岩浆底侵导致的隆升差异性控制了各次洼三级层序的展布、厚度和沉积充填。东部恩平20洼、恩平21西洼和恩平21东洼控洼断裂活动强度整体较强,文昌组以半深湖相和辫状河三角洲沉积为主,烃源条件和储盖组合良好,特别是恩平21东洼的缓坡带,是阳江东凹古近系勘探的有利区带。
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| 关 键 词： | 珠江口盆地 阳江凹陷 文昌组 原型盆地 勘探方向 沉积充填 |
Paleogene Structures and Exploration Potential in the Eastern Yangjiang Sag,Pearl River Mouth Basin |
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| LIANG Wei,PENG Guangrong,ZHU Dingwei,WU Jing,DU Xiaodong,CAI Guofu,WANG Xiaomeng,HE Jinhai,LI Sanzhong,SUO Yanhui.Paleogene Structures and Exploration Potential in the Eastern Yangjiang Sag,Pearl River Mouth Basin[J].Geotectonica et Metallogenia,2021,45(1):168-178. |
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| Authors: | LIANG Wei PENG Guangrong ZHU Dingwei WU Jing DU Xiaodong CAI Guofu WANG Xiaomeng HE Jinhai LI Sanzhong SUO Yanhui |
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| Institution: | (Shenzhen Branch,CNOOC China Limited,Shenzhen 518000,Guangdong,China;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) |
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| Abstract: | The Yangjiang Sag is a secondary structural unit of the ZhuⅢDepression in the northern depression zone of the Pearl River Mouth Basin.Five sub-sags are developed in the eastern part of the Yangjiang Sag.The activity intensities of the faults in the eastern Yangjiang Sag varied significantly in different periods of Paleogene.The rifting activity has the characteristics of“early in the east and late in the west,strong in the east and weak in the west”.The rifting and magma-induced uplifting of the Enping 21 Sub-sag in the east is stronger than those of the Yangjiang 24 Sub-sag and the Enping 19 Sub-sag in the west.The distribution and thickness of the third-order sequence in each sub-sag are controlled by the difference of fault activity and evolution.The differential magma-induced underplating controls the differential uplift of each sub-sag.Obvious uplifting and denudation occurred in the end of the depositional period of the Wen-3 and Wen-2 Members in the eastern Enping 21 Sub-sag.Among them,the denudation thickness at the end of the depositional period of the Wen-2 Member is 500 m.In general,the sedimentary filling of the third-order sequences in the eastern Yangjiang Sag is controlled by the intensity of fault activity,the range of provenance,and the distribution of gullies.The overall intensity of the sag-controlled fault activity in the Yangjiang 24 Sub-sag and the Enping 19 Sub-sag is weak,and the provenance is sufficient for them.The Wenchang Formation is dominated by the nearshore shallow lacustrine facies and the braided river delta facies deposits.The favorable Paleogene targets for exploration in the eastern Yangjiang Sag should have the basic conditions of effective traps,high-quality sand bodies,high-quality caprock,and favorable accumulation area.Based on a comprehensive analysis of the structural characteristics and reservoir-forming conditions of the Paleogene Wenchang Formation in the eastern Yangjiang Sag,it is considered that the exploration potential of the Paleogene is mainly concentrated in the eastern sub-sags such as the Enping 21 Sub-sag,with the lowstand delta sand body in the early stage of the Wen-3 Member sedimentation as the main exploration layer,and the lacustrine mudstone from the late stage of the Wen-3 Member sedimentation to the Wen-2 Member is the main caprock. |
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| Keywords: | Pearl River Mouth Basin Yangjiang Sag Wenchang Formation prototype basin exploration targets sedimentary filling |
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