| 东非鲁伍马盆地深水X气藏海底扇储层构型研究:重力流—底流交互作用的指示意义* |
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| 引用本文： | 张佳佳,吴胜和,王瑞峰,王敏,陈梅,王晓丰,徐庆岩,熊绮聪,余季陶,王黎.东非鲁伍马盆地深水X气藏海底扇储层构型研究:重力流—底流交互作用的指示意义*[J].古地理学报,2023,25(1):163-179. |
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| 作者姓名： | 张佳佳 吴胜和 王瑞峰 王敏 陈梅 王晓丰 徐庆岩 熊绮聪 余季陶 王黎 |
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| 作者单位： | 1.中国石油大学(北京)地球科学学院, 北京 102249;2.中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;3.中国石油勘探开发研究院, 北京 100083;4.中国石油莫桑比克公司, 北京 100034 |
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| 基金项目： | *国家自然科学基金(编号: 42002112,42272110),中石油与中国石油大学(北京)战略合作课题(编号: ZLZX2020-02)以及中国石油大学(北京)拔尖人才科研启动基金(编号: 2462022BJRC006)联合资助 |
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| 摘 要： | 底流在陆缘深水环境下广泛存在,可对深水沉积过程及砂体分布产生重要影响。前人对重力流与底流的交互作用机制及沉积产物开展了大量研究,但目前有关底流改造型的海底扇储层构型模式仍然研究不够深入。东非鲁伍马盆地是当前重力流—底流交互作用研究的热点地区,文中以其代表性的下始新统海底扇水道体系为例,综合岩心、测井及三维地震资料开展储层构型精细表征,建立重力流—底流交互作用下的海底扇水道体系构型模式。研究表明,目标水道体系内部发育水道、溢岸及朵叶3种构型要素,其中水道可分为水道复合体、单一水道及其内部不同级次的构型单元。底流对细粒物质的搬运可形成非对称的溢岸沉积,导致水道复合体之间呈逆底流侧向迁移叠置样式,其间泥岩隔层容易保存; 单一水道之间呈顺水道纵向迁移或逆底流侧向迁移样式,其中纵向迁移部位水道切叠连通,而侧向迁移部位容易保存泥质侧向隔挡体。受重力流沉积演化的影响,单一水道内部充填由砂泥交互型逐渐演化为富砂型,且在水道弯曲段的轴部砂体最为发育。
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| 关 键 词： | 鲁伍马盆地 海底扇 水道体系 储层构型 重力流 底流 |
| 收稿时间： | 2022-07-25 |
Submarine-fan reservoir architecture of deepwater gasfield X in Rovuma Basin offshore East Africa: insights for the interaction between sediment gravity flows and bottom currents |
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| ZHANG Jiajia,WU Shenghe,WANG Ruifeng,WANG Min,CHEN Mei,WANG Xiaofeng,XU Qingyan,XIONG Qicong,YU Jitao,WANG Li.Submarine-fan reservoir architecture of deepwater gasfield X in Rovuma Basin offshore East Africa: insights for the interaction between sediment gravity flows and bottom currents[J].Journal of Palaeogeography,2023,25(1):163-179. |
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| Authors: | ZHANG Jiajia WU Shenghe WANG Ruifeng WANG Min CHEN Mei WANG Xiaofeng XU Qingyan XIONG Qicong YU Jitao WANG Li |
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| Institution: | 1.College of Geosciences,China University of Petroleum(Beijing),Beijing 102249,China;2.State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249,China;3.Research Institute of Petroleum Exploration and Development,PetroChina, Beijing 100083,China;4.CNODC Mozambique Ltd.,Company, Beijing 100034,China |
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| Abstract: | Bottom currents are common phenomenon in the deepwater setting of continental margins,which have important impacts on the deepwater sedimentary process and sandstone distribution. Extensive studies have been focused on the mechanisms and sedimentary products of gravity flow-bottom current interaction,but it remains much unknown regarding the submarine-fan reservoir architecture model modified by bottom currents. The Rovuma Basin offshore East Africa is a typical region to study the interaction between sediment gravity flows and bottom currents. Taking the representative submarine channel systems from the Lower Eocene as an example,this paper characterizes the reservoir architecture by integrating cores,well logs and 3D seismic data,with an aim to establish the submarine channel architecture model under interaction of sediment gravity flows with bottom currents. Results show that the target channel system developed three types of architectural elements,channel,overbank,and lobe,where channel deposits contain channel complexes, individual channels,and other smaller hierarchical units. Fine-grained materials could be transported by bottom currents forming asymmetrical distribution of overbanks deposits. This forced channel complexes to migrate laterally against bottom currents,with shale barriers easily preserved. Individual channels show downstream migration or lateral migration against bottom currents. In downstream migration,channels incised each other forming good sand connectivity,while indined shale baffles may develop in lateral migration. As influenced by sediment gravity flows,individual channel-fills evolved from mixed sand-shale to sand-prone channels,and in the mapview sandbodies are mostly distributed in the axis of channel bends. |
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| Keywords: | Rovuma Basin submarine fan channel system reservoir architecture gravity flow bottom current |
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