| 基于浅地层剖面的海底浅表层沉积物物理性质参数反演技术研究 |
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| 引用本文： | 黄必桂,李家钢,周庆杰,李西双,刘乐军,高珊,周航,张承艺.基于浅地层剖面的海底浅表层沉积物物理性质参数反演技术研究[J].海洋学报,2022,44(9):156-164. |
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| 作者姓名： | 黄必桂 李家钢 周庆杰 李西双 刘乐军 高珊 周航 张承艺 |
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| 作者单位： | 1.中海油研究总院有限责任公司，北京 100028 |
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| 基金项目： | 基于地球物理数据的工程地质研究(YXKY-2018-ZY-10)；中央级公益性科研院所基本科研业务费专项 (2021Q03) |
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| 摘 要： | 海底浅表层（小于1 m）沉积物的物理性质，如粒度、孔隙度、密度等是海洋沉积学研究和海洋工程地质分析的重要内容，目前主要基于有限的海底取样或原位测试获取这些沉积物的物理性质。浅地层剖面是基于声学信号（频率几千赫兹）在沉积物中的传播得到可反映沉积地层结构的数据，其中的一些声学参数，如海底反射系数、波阻抗等与沉积物物理性质密切相关。如何充分而有效地利用浅地层剖面资料，反演得到剖面覆盖区海底浅表层沉积物的物理性质参数，极具科学意义和应用价值，且基于声学属性反演沉积物物理性质是当前研究的热点。为此，本文基于渤海LD16-3CEPA至LD10-1PAPD路由段的浅地层剖面数据和海底表层沉积物的实测物理参数，利用Biot-Stoll模型建立研究区海底反射系数和沉积物物理性质之间的关系，并基于浅地层剖面数据计算得到的海底反射系数，反演了研究区海底浅表层沉积物的孔隙度、密度、平均粒径等物理性质参数。其中反演的孔隙度、密度、平均粒径与实测孔隙度、密度、平均粒径基本相符，偏差度基本都在20%的偏差范围内，表明该反演方法在该区的应用是可行的。
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| 关 键 词： | 浅地层剖面 Biot-Stoll模型 海底反射系数 沉积物物理性质 渤海 |
| 收稿时间： | 2021-12-29 |
Research on inversion technology of physical properties parameters of seafloor sediments based on sub-bottom profile: Taking the Bohai Sea submarine pipeline route as an example |
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| Affiliation: | 1.China National Offshore Oil Corporation Research Institute Co. Ltd., Beijing 100028, China2.Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China |
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| Abstract: | The physical properties of seafloor sediments (less than 1 m), such as particle size, porosity and density, are an important part of marine sedimental research and marine engineering geological analysis. The acquisition of these physical properties is currently based on limited seabed sampling or in-situ testing. The sub-bottom profile is based on the propagation of acoustic signals (frequencies in thousands of Hertz) in sediments to obtain the data that can reflect the sedimentary stratigraphic structure. Some of the acoustic parameters, such as seabed reflection coefficient and wave impedance, are closely related to the physical properties of sediments. How to make full and effective use of the sub-bottom profile data to retrieve the physical property parameters of the seafloor sediments in the profile overlying area is of great scientific significance and application value. Moreover, inversion of the physical properties of sediments based on acoustic properties is a hot research topic at present. Therefore, in this paper, the Biot-Stoll model is used to establish the relationship between the seabed reflection coefficient and the physical properties of the sediments in the study area based on the measured physical parameters of the seafloor sediments from LD 16-3CEPA to LD10-1PAPD routing section of the Bohai Sea. Based on the seabed reflection coefficient calculated from the sub-bottom profile data, the physical property parameters such as porosity, density and mean grain size of the seabed sediment in the study area are retrieved. The porosity, density and mean grain size of the inversion are basically consistent with the measured, and the deviation degree is basically within the range of 20%, indicating that the application of the inversion method in this area is feasible. |
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