本文为中海油"十四五"重大科技课题子课题-西湖凹陷西部斜坡规模性岩性圈闭形成条件、发育规律及关键技术（CCL2022SHPS010RS）及西安石油大学研究生创新与实践能力培养计划项目（编号：YCS23213068）的成果
- 1）西安石油大学地球科学与工程学院，西安，710065；2）陕西省油气成藏地质学重点实验室，西安，710065
- 1）西安石油大学地球科学与工程学院，西安，710065；2）陕西省油气成藏地质学重点实验室，西安，710065
- 3）中海石油（中国）有限公司（上海分公司），上海，200335
- 3）中海石油（中国）有限公司（上海分公司），上海，200335
- 4）中石化地球物理公司科技研发中心，南京，210000
- 1）西安石油大学地球科学与工程学院，西安，710065；2）陕西省油气成藏地质学重点实验室，西安，710065
- 1）西安石油大学地球科学与工程学院，西安，710065；2）陕西省油气成藏地质学重点实验室，西安，710065
- 1) School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, 710065;2) Key Laboratory of Oil and Gas Reservoir Geology in Shaanxi Province, Xi’an Shiyou University, Xi’an, 710065
- 1) School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, 710065;2) Key Laboratory of Oil and Gas Reservoir Geology in Shaanxi Province, Xi’an Shiyou University, Xi’an, 710065
- 3) CNOOC China Limited, Shanghai Branch, Shanghai, 200335
- 3) CNOOC China Limited, Shanghai Branch, Shanghai, 200335
- 4) Sinopec geophysical corporation research and development center, Nanjing, 210000
- 1) School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, 710065;2) Key Laboratory of Oil and Gas Reservoir Geology in Shaanxi Province, Xi’an Shiyou University, Xi’an, 710065
- 1) School of Earth Sciences and Engineering, Xi’an Shiyou University, Xi’an, 710065;2) Key Laboratory of Oil and Gas Reservoir Geology in Shaanxi Province, Xi’an Shiyou University, Xi’an, 710065
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井震资料与沉积数值模拟结合分析有望厘清东海盆地西湖凹陷古近系平湖组中—上段水下低凸起与河潮交互作用间的耦合关系。利用井震资料初步探究研究区复杂地形地貌特点、潮汐作用特征；利用沉积数值模拟方法（Delft3D），建立理想化模型，通过改变地形特征和潮汐幅度条件，探究研究区水下低凸起—潮流耦合关系特征。模拟结果显示：① 受水下低凸起地形影响，研究区砂体在涨潮与退潮过程中发育规模性潮汐砂坝与砂席。② 特定地貌特征下，三角洲被改造程度分别和潮汐幅度、河流流量呈正相关，发育规模性潮汐砂坝、砂席及潮汐砂脊；相同潮汐幅度下，水下低凸起地形较障壁岛地形，形成砂坝、砂席及潮汐砂脊规模更大。研究表明，研究区三角洲的改造演化历程可以划分为3个阶段：河流主控阶段、潮汐改造阶段、地形—河潮耦合控制阶段。研究区复杂地貌—潮流的耦合作用对砂体的改造效应在由水下低凸起所塑造的潮汐通道两侧主要表现为潮汐砂坝与砂席。这一特殊地貌与河潮水动力的相互作用，显著区别于障壁岛海岸体系，更有利于形成规模性岩性圈闭。
This study aims to clarify the coupling relationship between subaqueous low- relief uplifts and fluvio- tidal interactions in the Pinghu Formation（the middle and upper sections） of the Xihu Sag, East China Sea Basin, by integrating well- seismic data with sedimentary simulations.Methods: Using well- seismic data, the complex topography, landforms, and tidal action features of the study area were first analyzed. An idealized model was then established using the Delft3D sedimentary numerical simulation method, which investigated the coupling between subaqueous low- relief uplifts and tidal currents by altering topographic characteristics and tidal amplitude conditions. Results: The results reveal that the underwater low- relief topography promotes the development of large- scale tidal sandbars and extensive sand sheets during flood and ebb tides, while delta modification is positively correlated with tidal amplitude and river discharge, forming larger tidal sandbars, sheets, and ridges compared to barrier island systems under similar conditions. Conclusions: The delta’s evolution in the study area progresses through three stages: river- dominated, tidal reworking, and topography—river—tidal coupling control. The interaction between complex geomorphology and tidal currents primarily shapes tidal sandbars and sand sheets along tidal channels, driven by low- relief topography. This unique geomorphic—hydrodynamic interaction, distinct from barrier island systems, is more favorable for the formation of large- scale lithologic traps.
引用本文
杨潘,李磊,陈忠云,李帅,张忠坡,柴亚伟,赵兴.2025.东海盆地西湖凹陷平北地区平湖组复杂地貌与河潮交互作用及沉积响应[J].地质论评,70(2):2025020015,[DOI].
YANG Pan, LI Lei, CHEN Zhongyun, LI Shuai, ZHANG Zhongpo, CHAI Yawei, ZHAO Xing.2025. Complex geomorphology and fluvio- tidal interaction and sedimentary response of the Pinghu Formation in Pingbei area, the Xihu Sag, East China Sea Basin[J]. Geological Review,70(2):2025020015.
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- 收稿日期:2025-01-20
- 最后修改日期:2025-04-04
- 在线发布日期: 2024-03-20
- 出版日期: 2024-03-15
