东非鲁伍马盆地下始新统沉积水动力学机制

doi:10.11885/j.issn.1674-5086.2024.09.03.03

西南石油大学学报(自然科学版) ›› 2025, Vol. 47 ›› Issue (1): 80-94.DOI: 10.11885/j.issn.1674-5086.2024.09.03.03

• 深海油气勘探与开发地质专刊 • 上一篇下一篇

东非鲁伍马盆地下始新统沉积水动力学机制

赵文楷¹, 许小勇², 田冬梅¹, 张颖², 吴佳男^2,3

1. 浙江海洋大学海洋科学与技术学院, 浙江舟山 316022;
2. 中国石油杭州地质研究院, 浙江杭州 310023;
3. 中国地质大学(武汉) 海洋地质资源湖北省重点实验室, 湖北武汉 430074

收稿日期:2024-09-03 发布日期:2025-03-12
通讯作者: 田冬梅,E-mail:tiandongmei527@126.com
作者简介:赵文楷，2000年生，男，汉族，湖北老河口人，硕士，主要从事深水沉积和深水沉积动力学等方面的研究。E-mail：1594729560@qq.com
许小勇，1983年生，男，汉族，江苏无锡人，高级工程师，硕士，主要从事深水沉积油气勘探等方面的研究工作。E-mail：xuxy_hz@petrochina.com.cn
田冬梅，1990年生，女，汉族，重庆人，讲师，博士，主要从事深水沉积和沉积水动力学等方面的研究工作。E-mail：tiandongmei527@126.com
张颖，1971年生，女，汉族，河南民权人，高级工程师，主要从事地震资料解释及地震资料综合研究的工作。E-mail：zhangying_hz@petrochina.com.cn
吴佳男，1988年生，男，汉族，吉林吉林人，高级工程师，博士，主要从事深水沉积学与深水沉积油气勘探开发研究的工作。E-mail：wujn_hz@petrochina.com.cn
基金资助:
海洋地质资源湖北省重点实验室开放基金（MGR202303)

Hydrodynamic of the Lower Eocene in the Ruvuma Basin, East Africa

ZHAO Wenkai¹, XU Xiaoyong², TIAN Dongmei¹, ZHANG Ying², WU Jianan^2,3

1. Marine Science and Technology College, Zhejiang Ocean University, Zhoushan, Zhejiang 316022, China;
2. Hangzhou Research Institute of Petroleum Geology, PetroChina, Hangzhou, Zhejiang 310023, China;
3. Hubei Key Laboratory of Marine Geological Resources, China University of Geosciences (Wuhan) , Wuhan, Hubei 430074, China

Received:2024-09-03 Published:2025-03-12

摘要/Abstract

摘要： 重力流与底流交互作用可形成不对称单向迁移水道，前人建立了单向迁移水道的演化模式，但在重力流与底流交互作用的水动力学机制研究方面较为薄弱。针对东非鲁伍马盆地下始新统沉积体系早期和晚期不同条件下的重力流与底流交互作用，开展沉积水动力数值模拟研究，结果表明，在研究区下始新统沉积体系中，底流将水道内重力流顶部的细粒沉积物裹挟并向北漂移，在水道北侧形成不对称天然堤。沉积物长期在北侧集聚形成漂积体，不对称沉积使水道北侧变陡；水道南侧则由于两反向流体的碰撞侵蚀作用增强，使该侧限制性作用减弱并形成新的负地形。在该不对称沉积模式的长期作用下水道逐渐向南迁移。通过揭示鲁伍马盆地下始新统不同沉积时期重力流与底流交互作用的水动力过程，阐明了流体结构对水道的沉积—侵蚀机制，从流体动力学角度解析了不对称单向迁移水道的成因机理。

关键词: 重力流, 底流, 数值模拟, 交互机制, 东非鲁伍马盆地

Abstract: The interaction between gravity flow and underflow can form an asymmetric unidirectional migration channel. The evolution model of unidirectional migration channel has been established by predecessors, but the hydrodynamic mechanism of the interaction between gravity flow and underflow is relatively weak. In this study, the sedimentary hydrodynamic numerical simulation of the interaction between gravity flow and underflow under different conditions in the early and late Lower Eocene in the Ruvuma Basin, East Africa was carried out. The results of the study are as follows: in the early Lower Eocene of the Ruvuma Basin, the restrictive effect of the channel is strong, and the sedimentation of gravity flow is the main effect; in the late period, Under the interaction of gravity flow and bottom current, the fine sediment at the top of gravity flow in the channel drifts northward, forming an asymmetric natural dike on the north side of the channel. Under the action of the crosswise fluid caused by the bottom current, the fine sediment at the top of the gravity flow is transported northward. As sediments gradually accumulate on the north side to form drift deposits, lateral sedimentation steepens the north side of the channel. The two opposite fluids collide in the south side of the channel, the erosion effect is enhanced, in the south side of the strong erosion, the restrictive action is weakened and a new negative terrain is formed. This asymmetric sedimentation pattern gradually migrates the sewers to the south for a long time. By revealing the depositional hydrodynamic processes of the interaction between gravity flow and bottom current in different periods of the Lower Eocene in the Ruvuma Basin, this study elucidates the sediment-erosion mechanism of the fluid structure on the channel and analyzes the genetic mechanism of the asymmetric unidirectional migration channel from the perspective of fluid dynamics.

Key words: gravity current, bottom current, numerical simulations, interactive mechanism, the Ruvuma Basin, East Africa

中图分类号:

TE122

赵文楷, 许小勇, 田冬梅, 张颖, 吴佳男. 东非鲁伍马盆地下始新统沉积水动力学机制[J]. 西南石油大学学报(自然科学版), 2025, 47(1): 80-94.

ZHAO Wenkai, XU Xiaoyong, TIAN Dongmei, ZHANG Ying, WU Jianan. Hydrodynamic of the Lower Eocene in the Ruvuma Basin, East Africa[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(1): 80-94.

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东非鲁伍马盆地下始新统沉积水动力学机制

Hydrodynamic of the Lower Eocene in the Ruvuma Basin, East Africa

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