| 琼东南盆地北礁凹陷上新统等深流影响的水道沉积体系 |
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| 引用本文： | 李俞锋，蒲仁海，樊笑微，等. 琼东南盆地北礁凹陷上新统等深流影响的水道沉积体系[J]. 海洋学报，2022，44(10)：80–89 doi: 10.12284/hyxb2022116 |
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| 作者姓名： | 李俞锋 蒲仁海 樊笑微 张功成 赵学钦 鲍晶晶 李雅漠 王炯 |
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| 作者单位： | 西南科技大学环境与资源学院固体废物处理与资源化教育部重点实验室,四川绵阳 621010;西北大学大陆动力学国家重点实验室,陕西西安710069;自然资源部海底矿产资源重点实验室,广东广州 510075;西北大学大陆动力学国家重点实验室,陕西西安710069;陕西延长石油(集团)有限责任公司研究院,陕西西安 710075;中海油研究总院有限责任公司,北京 100027;西南科技大学环境与资源学院固体废物处理与资源化教育部重点实验室,四川绵阳 621010;自然资源部第三海洋研究所海洋与海岸地质实验室,福建厦门 361005;四川工程职业技术学院,四川德阳 618030;中国石油天然气股份有限公司西南油气田分公司川中油气矿,四川遂宁 629200 |
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| 基金项目： | 自然资源部海底矿产资源重点实验室公开基金（KLMMR-2018-B-07）；国家科技重大专题（2011ZX05025-006-02）；国家自然科学基金重大项目（41390451）。 |
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| 摘 要： | 等深流影响的水道沉积体系的沉积特征及其沉积过程是当前深水沉积学研究的热点、难点和前沿科学问题，但研究程度较为薄弱。该文以北礁凹陷上新统（地震反射T20−T30）为研究对象，利用覆盖北礁凹陷局部的三维地震资料，采用均方根属性、相干属性、时间域构造，再结合地震切片等方法，研究北礁凹陷深水区上新统斜交斜坡（走向）的特殊水道沉积体系特征及其沉积过程。研究发现，该水道沉积体系分为早、晚两期，早期发育水道和片状、扇状溢堤沉积，晚期仅发育水道和片状溢堤沉积，其中扇状溢堤沉积仅发育在水道右侧弯曲处，片状溢堤沉积仅分布在水道左侧，水道始终与区域斜坡斜交，水道对称分布且无明显迁移现象。结合该时期北礁凸起发育等深流相关的丘状漂积体和环槽，认为该水道沉积体系特殊的形态主要受控于等深流与浊流交互作用的沉积结果：浊流流经水道，其上覆浊流溢出水道，形成溢岸浊流，在水道左侧，该溢岸浊流与等深流发生相向运动，被等深流“吹拂”到单侧，大面积分布，延伸千米，形成片状溢堤沉积；而在水道弯曲处（右侧），溢岸浊流与等深流发生相对运动，抑制溢岸浊流进一步扩展，形成相对小范围扇状溢堤沉积，该沉积结果与前人水槽实验结果相一致。
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| 关 键 词： | 北礁凹陷 水道沉积体系 溢堤沉积 等深流 浊流 |
| 收稿时间： | 2021-04-14 |
| 修稿时间： | 2022-02-11 |
Pliocene channel sedimentary system influenced by contour currents in the Beijiao Sag,Qiongdongnan Basin |
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| Li Yufeng，Pu Renhai，Fan Xiaowei, et al. Pliocene channel sedimentary system influenced by contour currents in the Beijiao Sag, Qiongdongnan Basin[J]. Haiyang Xuebao，2022, 44(10)：80–89 doi: 10.12284/hyxb2022116 |
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| Authors: | Li Yufeng Pu Renhai Fan Xiaowei Zhang Gongcheng Zhao Xueqin Bao Jingjing Li Yamo Wang Jiong |
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| Affiliation: | 1. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;;2. State Key Laboratory of Continental Dynamics, Department of Ueology, Northwest University, Xi’an 710069, China;;3. Key Laboratory of Marine Mineral Resources, Ministry of Natural Resources, Guangzhou 510075, China;;4. Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi’an 710075, China;;5. CNOOC Research Institute Co., Ltd., Beijing 100027, China;;6. Laboratory of Ocean and Coast Geology, Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China;;7. Sichuan Engineering Technical College, Deyang 618030, China;;8. Central Sichuan Division, Petro China Southwest Oil & Gas Field Company, Suining 629200, China |
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| Abstract: | Depositional characteristics and process of deep-water channel sedimentary system influenced by contour currents is a current hotspot and new scientific issue in the study of deposits resulted from interaction between contour currents and turbidity flows. Using root mean square (RMS) attribute, coherenceseismic attribute, time structure and stratal slice, we focus on depositional characteristics and process of the channel sedimentary system in Pliocene strata in the Beijiao Sag, Qiongdongnan Basin. The results show that the channel sedimentary systems are divided into the early and late channel sedimentary systems. The depositonal units of the early system include channel, flake-shaped and fan-shaped overbank deposits. The units of the late systems incorporate: channel and flank-shaped overbank deposits. Fan-shaped overbank deposits are only distributed on the right side of the bend of the channel. Flake-shaped overbank deposits are only located on the left side of the channel. The channels are persistently oblique to the strike of the slope and they are symmetrical and characterized by vertical aggradations. Combined with the development features of mounded drifts and moats over the Beijiao uplift, it is inferred that the geometry of the channel sedimentary systems are mainly controlled by depositional products of the interaction between turbidity flows and contour currents. Contour currents flow across channels, forcing the upper part (low velocity and low density) of turbidity flows to deflect towards the left (downstream) side of channels and then form overspill currents. The direction of overspills is the same to that of contour currents, in this case, generating wide flake-shaped overbank deposits extending for several kmlometers. In the bend of channels, the direction of overspill currents is in contrast to that of contour currents, blocking or confining the range of the overbank deposits and then creating fan-shaped overbank deposits. This result are consistent with the previous results of flume-tank experiment. |
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| Keywords: | Bejiao Sag channel sedimentary system overbank deposits contour currents turbidity flows |
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