Extraction of seismic velocity of marine strata and their characteristics in the South Yellow Sea basin

SHI Jian; CHEN Chunfeng; CHEN Jianwen; LIU Jun; LEI Baohua

doi:10.16562/j.cnki.0256-1492.2018.03.017

Marine Geology & Quaternary Geology > 2018 > 38(3): 175-185. > DOI: 10.16562/j.cnki.0256-1492.2018.03.017

SHI Jian, CHEN Chunfeng, CHEN Jianwen, LIU Jun, LEI Baohua. Extraction of seismic velocity of marine strata and their characteristics in the South Yellow Sea basin[J]. Marine Geology & Quaternary Geology, 2018, 38(3): 175-185. DOI: 10.16562/j.cnki.0256-1492.2018.03.017

Citation:

Extraction of seismic velocity of marine strata and their characteristics in the South Yellow Sea basin

SHI Jian^1,2,3,4,,
CHEN Chunfeng⁵,
CHEN Jianwen^3,4, ,,
LIU Jun^3,4,
LEI Baohua^3,4

1.
Institute of Geophysics and Geomatics, China University of Geosciences(Wuhan), Wuhan 430074, China
2.
Chinese Academy of Geological Sciences, Beijing 100037, China
3.
Laboratory for Marine Mineral Resource, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China
4.
Qingdao Institute of Marine Geology, China Geological Survey, Qingdao 266071, China
5.
Shanghai Branch of CNOOC Ltd., Shanghai 200335, China

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Received Date: January 25, 2018
Revised Date: March 25, 2018

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Abstract

Abstract

It is difficult to acquire accurate seismic velocity from the marine strata in the South Yellow Sea Basin due to its special seismic geological conditions. From multi-channel seismic data, we extracted reliable Mesozoic-Paleozoic velocity of marine strata by combining the velocity analysis together with multi-data controlling, first-break tomographic inversion and layer-constrained grid tomographic technique. The velocity distribution pattern of marine strata in the South Yellow Sea is then summarized according to extracted seismic velocity and drilling information from the Lower Yangtze region. The distribution of strata velocity in this area shows a pattern of alternation of high and low velocity with mutation and inversion. The marine lower tectonic layer is high in velocity and the velocity difference between layers is small. The velocity distribution of marine lower tectonic layer is still uncertain because of lacking in drilling data in the sea area.
- seismic velocity,
- velocity semblance,
- tomographic inversion,
- marine strata,
- the South Yellow Sea Basin

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References (26)

References

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Extraction of seismic velocity of marine strata and their characteristics in the South Yellow Sea basin