Downward shift of gas hydrate stability zone due to seafloor erosion in the eastern Dongsha Island, South China Sea

Jiapeng JIN; Xiujuan WANG; Min HE; Jie LI; Chengzhi YAN; Yuanping LI; Jilin ZHOU; Jin QIAN

doi:10.1007/s00343-020-0064-z

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Downward shift of gas hydrate stability zone due to seafloor erosion in the eastern Dongsha Island, South China Sea

Geology | Updated：2023-04-27

- Downward shift of gas hydrate stability zone due to seafloor erosion in the eastern Dongsha Island, South China Sea
- Journal of Oceanology and Limnology Vol. 38, Issue 4, Pages: 1188-1200(2020)
- Affiliations：
  
  1.Key Laboratory of Marine Geology and Environment & Center of Deep-Sea Research, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266071, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
  4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  5.Shenzhen Branch of China National Offshore Oil Corporation Ltd, Shenzhen 518054, China
- Author bio：
  
  WANG Xiujuan,wangxiujuan@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-020-0064-z
  CLC：
- Received：22 January 2020，
  
  Accepted：21 February 2020，
  
  Online First：14 March 2020，
  
  Published：2020-07
- Accepted：
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Jiapeng JIN, Xiujuan WANG, Min HE, et al. Downward shift of gas hydrate stability zone due to seafloor erosion in the eastern Dongsha Island, South China Sea[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1188-1200.
DOI：

Jiapeng JIN, Xiujuan WANG, Min HE, et al. Downward shift of gas hydrate stability zone due to seafloor erosion in the eastern Dongsha Island, South China Sea[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1188-1200. DOI： 10.1007/s00343-020-0064-z.

摘要

Abstract

New acquired and reprocessed three-dimensional (3D) seismic data were used to delineate the distribution and characterization of bottom simulating reflections (BSRs) in the Chaoshan Sag

in the eastern part of Dongsha Island

South China Sea. Three submarine canyons with different scales were interpreted from the 3D seismic data

displaying three stages of canyon development and are related with the variation of BSR. Abundant faults were identified from the coherence and ant-tracing attributions extracted from 3D seismic data

which provide the evidence for fluid migration from deeper sediments to the gas hydrate stability zone (GHSZ). The uplift of Dongsha Island created a large number of faults and leads to the increased seafloor erosion. The erosion caused the cooling of the seafloor sediments and deepening of the base of the gas hydrate stability zone

which is attributed to the presence of paleo-BSR and BSR downward shift in the study area. Hence

methane gas may be released during the BSR resetting and gas hydrate dissociation related with seafloor erosion.

关键词

Keywords

references

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