Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea

Liu Bin

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Liu Bin. Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 68-75.

Citation:

Liu Bin. Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 68-75.

Liu Bin. Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 68-75.

Citation:

Liu Bin. Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea[J]. Haiyang Xuebao, 2017, 39(3): 68-75.

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Gas and gas hydrate distribution around seafloor mound in the Dongsha area, north slope of the South China Sea

Liu Bin

Key Laboratory of Marine Mineral Resource, Ministry of Land and Resource, Guangzhou Marine Geological Survey, Guangzhou 510075, China

Received Date: 2016-06-02

Abstract

Abstract

Seafloor mound is common in gas hydrate reservoirs. The investigation of seafloor mound can help to understand the pattern of fluid seepage and the occurrence of gas hydrate. This paper investigated a seafloor mound in the Dongsha area, north slope of the South China Sea, where gas hydrate has been sampled. The data used include 3D seismic, multi-beam bathymetric and sub-bottom profiler data. On the multi-beam bathymetric data, seafloor mound manifests itself as an outstanding elevated morphologic feature, with height of ~50 m and diameter of ~300 m. Acoustic blanking zone in the sub-bottom profiler indicates the distribution of gas and the fluid migration pathway. Clearly observable BSR around the seafloor mound suggests the localized occurrence of gas hydrate, which is verified by the drilling program. Though acoustic blanking is also presented in the 3D seismic profiles, enhanced amplitude and continuous reflector directly beneath the mound indicates that the mound is probably not originated from mud volcano. Sediments expansion due to the formation of gas hydrate may be a better explanation.
- South China Sea,
- the northeastern slope,
- seafloor mound,
- gas hydrate

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References(26)

References

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