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古地理学报 ›› 2025, Vol. 27 ›› Issue (6): 1590-1606. doi: 10.7605/gdlxb.2025.086

• 综述 • 上一篇    下一篇

海底滑坡沉积的反射地震特征、物性与石油地质意义*

韩政豪1(), 吴南1(), 任金锋2, 李攀3, 李文婧1, 王毕文1, 陈万利4   

  1. 1 同济大学海洋地质全国重点实验室, 上海 200092
    2 广州海洋地质调查局, 广东广州 510075
    3 中国石油勘探开发研究院, 北京 100083
    4 中国科学院深海科学与工程研究所, 海南三亚 572000
  • 收稿日期:2025-01-09 修回日期:2025-03-12 出版日期:2025-12-01 发布日期:2025-11-25
  • 通讯作者: 吴南,男,1990年生,博士,副教授,主要从事地震地层学与深水沉积学研究。E-mail: nanwu@tongji.edu.cn
  • 作者简介:

    韩政豪,男,2001年生,硕士研究生,主要从事海底滑坡沉积物性及石油地质意义研究。E-mail:

  • 基金资助:
    *国家重点研发计划项目(2021YFC2800901); 国家自然科学基金项目(42406060); 上海市“科技创新行动计划”启明星项目(扬帆专项)(13502360178); 上海市自然科学基金面上项目(13502360190)

Seismic reflection characteristics,petrophysical properties, and petroleum implications of submarine landslide deposits

HAN Zhenghao1(), WU Nan1(), REN Jinfeng2, LI Pan3, LI Wenjing1, WANG Biwen1, CHEN Wanli4   

  1. 1 State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
    2 Guangzhou Marine Geological Survey, Guangzhou 510075, China
    3 Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
    4 Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences, Hainan Sanya 572000, China
  • Received:2025-01-09 Revised:2025-03-12 Online:2025-12-01 Published:2025-11-25
  • Contact: WU Nan,born in 1990,PhD,an associate professor,is mainly engaged in seismic stratigraphy and deep-water sedimentology research. E-mail: nanwu@tongji.edu.cn.
  • About author:

    HAN Zhenghao,born in 2001,a master’s degree candidate, is mainly engaged in studying the petrophysical properties and petroleum implications of mass transport deposits. E-mail: .

  • Supported by:
    Co-funded by the National Key Research Program(2021YFC2800901); National Natural Science Foundation of China(42406060); Shanghai Qimingxing Project(Yangfan Special Project)(13502360178); Natural Science Foundation of Shanghai(13502360190)

摘要:

海底滑坡及其伴生的高密度碎屑流与浊流沉积,构成了全球各深海盆地沉积产物的重要组成部分。最新获取的大洋科学钻探与工业钻井资料研究表明,海底滑坡沉积具有较高的密度、电阻率、纵波速度和不排水抗剪强度,与较低的孔隙度、含水量,以及杂乱分布的倾角与倾向。这些物性特征和产状特征表明,海底滑坡沉积的内部变形和压实程度均高于周缘未破坏海底沉积物。此外,海底滑坡沉积底部层段(15~30 m)表现出低于海底滑坡沉积内部的含水量和孔隙度响应,以及高于内部的纵波速度和电阻率响应。该层段被解释为底部剪切带,是单期次海底滑坡沉积中最固结、最致密的结构单元。海底滑坡沉积及其底部剪切带可作为深海油气与天然气水合物的天然封堵层,有效抑制油气和水合物资源的逸散。其次,富泥质底部剪切带及滑水效应显著降低了海底滑坡的侵蚀能力,从而使得海底滑坡沉积富砂质层段在长距离搬运过程中保持了内部结构的完整性,使其具备成为优质深海储集层的潜力。研究海底滑坡沉积的物性与石油地质意义有助于梳理深海常规油气和天然气水合物资源的成藏与富集规律,并为后续深海油气的勘探开发以及深海碳封存选址提供关键的地质信息。

关键词: 海底滑坡沉积, 底部剪切带, 物性特征, 石油地质意义

Abstract:

Submarine landslides and their associated high-density debris flows and turbidity currents constitute an important component of deep-sea sedimentary basins worldwide. Aiming at exploring the petroleum implications of submarine landslide deposits,the lithological,petrophysical,and geotechnical properties of submarine landslide deposits are summarized based on newly-collected petrophysical logging data,geotechnical experiments and stratigraphic logging data. Submarine landslide deposits are characterized by: higher density,resistivity,P-wave velocity,and undrained shear strength,along with low porosity,water content,and disorderly distributed dip angles and dip direction azimuths. These features indicate that submarine landslide deposits undergo more intense internal deformation and compaction compared to surrounding undisturbed strata. Abnormally high P-wave velocity and resistivity responses are observed in an interval(15 to 30 meters)above the basal shear surface of a single submarine landslide deposit,which is interpreted as the most consolidated and condensed structural unit called basal shear zone(BSZ). BSZ can serve as natural seals to effectively inhibit the escape of deep-sea hydrocarbons and gas hydrates. Additionally,muddy BSZ combined with hydroplaning effects significantly reduces the erosional capacity of submarine landslides,allowing sandy layers within the deposits to preserve their structural integrity during transport and thereby enhancing their potential as high-quality deep-sea reservoirs. Investigating the physical properties and petroleum geological implications of submarine landslide deposits contributes to understanding the accumulation mechanisms of conventional hydrocarbons and gas hydrates in deep-sea environments,providing critical geological insights for future energy exploration,development,and carbon sequestration site selection.

Key words: submarine landslide deposit, basal shear zone, petrophysical characteristics, petroleum implication

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