| 摘要: |
| 琼东南盆地陆架边缘发育多种类型的灾害地质特征，本文利用船载调查数据、AUV调查数据和三维地震数据，对研究区水深100~250m范围内发育的灾害地质特征进行了精细刻画，并分析了成因和控制因素。经过分析，将研究区内的灾害分为海底灾害因素和浅层灾害因素两大类。其中海底灾害因素包括海底凸起、海底麻坑、残留古海岸、海底陡坎和沙波；浅层灾害地质因素包括活动断层和埋藏古河道。经过分析，认为琼东南盆地陆架边缘灾害地质因素主要受海平面变化、构造作用和沉积物供给因素控制，残留古海岸、沙波、海底陡坎和埋藏古河道等多与海平面变化相关，而活动断层、海底凸起、海底麻坑等多受到区域构造作用控制；受沉积物供给量的影响，研究区东部多发育以碳酸盐型古海岸及碳酸盐台地为主的海岸带特征，西部更倾向于发育沙波、埋藏古河道等与陆源碎屑相关的特征类型。 |
| 关键词: 琼东南陆架边缘 灾害地质特征 分布规律 成因分析 |
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| 基金项目:国家重点研发计划课题（2023YFC3008601）；深圳市科技重大专项项目（KJZD20231025152759002） |
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| Analysis of the Distribution Pattern and Cause of Disaster Geological Characteristics on the Edge of the Qiongdongnan Shelf |
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Li Yufei1, Feng Xiangzi1, Zhu Yousheng1, Yang Lan1, Zhao Le2, Qi Mingzhu3, Wang Weiwei4, Wang Dawei5,6
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1.COSL Geophysical,China Oilfield Services Ltd;2.Institute of Deep Earth Science and Green Energy, Shenzhen University;3.Shenzhen Institute of Surveying and Mapping (Group) Co., LTD;4.School of Control Science and Engineering, China University of Petroleum;5.Institute of Deep Sea Science and Engineering, Chinese Academy of Sciences;6.China Guangdong Laboratory of Southern Marine Science and Engineering (Zhuhai),
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| Abstract: |
| A variety of disaster geological features are developed at the shelf edge of the Qiongdongnan Basin. Based on the shipborne survey data, AUV survey data and 3D seismic data, this paper precisely characterizes the disaster geological features within the water depth range of 100~250m in the study area, and analyzes their causes and controlling factors. After analysis, the disasters in the study area are classified into two major categories: submarine disaster factors and shallow disaster geological factors. Among them, submarine disaster factors include submarine bulges, submarine pockmarks, ancient coast, submarine scarps and sand waves; shallow disaster geological factors include active faults and shallow buried channels. Through analysis, it is believed that the disaster geological factors at the shelf edge of the Qiongdongnan Basin are mainly controlled by sea level changes, tectonic activities and sediment supply factors. Residual ancient coast, sand waves, submarine scarps and shallow buried channels are mostly related to sea level changes, while active faults, submarine bugles and submarine pockmarks are more controlled by regional tectonic activities. Affected by the sediment supply, the eastern part of the study area is more prone to develop coastal features dominated by carbonate coasts and carbonate platforms, while the western part is more likely to develop features related to terrigenous sediments such as sand waves and shallow buried channels. |
| Key words: Qiongdongnan shelf margin Geological characteristics of disaster Distribution law Cause analysis |