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

Huang Bigui; Li Jiagang; Zhou Qingjie; Li Xishuang; Liu Lejun; Gao Shan; Zhou Hang; Zhang Chengyi

doi:10.12284/hyxb2022113

Volume 44 Issue 9

Aug. 2022

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Article Navigation > Haiyang Xuebao > 2022 > 44(9): 156-164

Huang Bigui，Li Jiagang，Zhou Qingjie, et al. 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[J]. Haiyang Xuebao，2022, 44(9)：156–164 doi: 10.12284/hyxb2022113

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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

doi: 10.12284/hyxb2022113

1.
China National Offshore Oil Corporation Research Institute Co. Ltd., Beijing 100028, China
2.
Key Laboratory of Marine Geology and Metallogeny, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China

Received Date: 2021-12-29
Rev Recd Date: 2022-04-05

Available Online: 2022-05-16

Publish Date: 2022-08-29

Abstract

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.
- sub-bottom profile,
- Biot-Stoll model,
- seafloor reflection coefficient,
- physical properties of sediments,
- Bohai Sea

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References

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