| Rio Muni盆地第四纪陆坡地震地貌学 |
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| 引用本文： | 李磊,李志军,闫瑞,谭卓,王小刚,都鹏燕.Rio Muni盆地第四纪陆坡地震地貌学[J].沉积学报,2014,32(3):485-493. |
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| 作者姓名： | 李磊 李志军 闫瑞 谭卓 王小刚 都鹏燕 |
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| 作者单位： | 西安石油大学地球科学与工程学院;重庆科技学院;中海油研究总院;中海油田服务股份有限公司油田技术事业部资料解释中心;中国石油大学(北京)地球科学学院; |
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| 基金项目： | 国家自然科学基金(批准号:41302147,41372118);国家级大学生创新创业训练计划项目(编号:201210705013)联合资助 |
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| 摘 要： | 基于Rio Muni盆地深水区1 400 km2的高分辨率三维地震资料，对第四纪陆坡开展地形、地貌单元的构型、成因及演化研究。主要取得3点结论:①依据海底坡度，研究区海底地形具有东西分带，南北分区的特点。②研究区发育水道（顺直水道和弯曲水道）、滑坡（陆坡滑坡和水道壁滑坡）及海底麻坑（孤立麻坑和条带状麻坑）3类典型地貌单元。上陆坡主要发育顺直水道，弯曲水道带发育在中-下陆坡。弯曲水道主要分布在南北2区，而顺直水道在南中北3区均有发育。水道的弯曲程度与海底坡度、重力流供给密切相关。③条带状海底麻坑主要分布在南北2区，孤立麻坑3区均发育。单一麻坑任意方向的剖面均具有“U”形或“V”形特征，其下方的气烟囱具有振幅增强，同相轴下拉特征。条带状麻坑分布在古水道上方或两侧的海底, 其走向剖面具有脊-槽相间地形特征。古水道和浅层气的逸散是形成条带状海底麻坑的主要因素。
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| 关 键 词： | 地震地貌学 水道 海底麻坑 滑坡 第四纪 Rio Muni盆地 |
| 收稿时间： | 2013-07-21 |
Seismic Geomorphology of Quaternary Continental Slope in Rio Muni Basin |
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| Abstract: | High-resolution 3-D seismic data covering 1 400 km2 of the Rio Muni Basin enabled a detailed study of the Quaternary continental slope submarine topography and the configuration, origin and evolution of geomorphic elements. Three main conclusions about the area under investigation can be drawn in this paper. Firstly, based on the gradient, the seafloor topography shows a north-south partition. Secondly, submarine channels (both straight and sinuous types), submarine slides (both continental slope and channel wall) and seabed pockmarks (isolated pockmarks and sinuous pockmark belts) can be identified. Straight submarine channels developed mainly in the upper continental slope, and sinuous submarine channels developed in the middle and lower slopes. Sinuous submarine channels are mainly distributed in the north and south of Zone 2, and straight submarine channels are mainly in the south, middle and north of Zone 3. The sinuosity of submarine channel is related to the gradient of the seafloor and gravity flow supply. Thirdly, sinuous pockmark belts are distributed mainly in the north and south of Zone 2, and isolated pockmarks are mainly in the south, middle and north of Zone 3. The seismic profile of a single pockmark at any direction is characterized by U-type or V-type. The seismic events of a gas chimney linked to a pockmark show high-amplitude reflection and pull-down effect. The sinuous pockmark belts lie on the seabed above the palaeo-channel. The seafloor along the sinuous pockmark belts is characterized by a ridge-and-swale topography. Palaeo-channels and escape of the shallow gas are the main controlling factors of the sinuous pockmark belts. |
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