Early diagenesis records and chemical composition abnormalities in pore water for methane-seep in sediments from the southern Qiongdong Basin

WU Dai-dai; YE Ying; WU Neng-you; JIANG Hong-chen; JI Shan-shan; DONG Hai-liang; LIU Jian

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Article Navigation > Haiyang Xuebao > 2009 > 31(2): 86-96

WU Dai-dai, YE Ying, WU Neng-you, JIANG Hong-chen, JI Shan-shan, DONG Hai-liang, LIU Jian. Early diagenesis records and chemical composition abnormalities in pore water for methane-seep in sediments from the southern Qiongdong Basin[J]. Haiyang Xuebao, 2009, 31(2): 86-96.

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Early diagenesis records and chemical composition abnormalities in pore water for methane-seep in sediments from the southern Qiongdong Basin

1.
Key Laboratory of Renewable Energy and Gas Hydrate of Guangzhou Institute of Energy Conversion of Chinese Academy of Sciences, Guangzhou Energy Institute, Chinese Academy of Sciences, Guangzhou 510640, China;Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China
2.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China
3.
Key Laboratory of Renewable Energy and Gas Hydrate of Guangzhou Institute of Energy Conversion of Chinese Academy of Sciences, Guangzhou Energy Institute, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Center for Gas Hydrate Research, Chinese Academy of Sciences, Guangzhou 510640, China;Guangzhou Marine Geological Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510075, China
4.
Department of Geology, Miami University, Oxford 45056, USA
5.
Guangzhou Marine Geological Survey Bureau, Ministry of Land and Natural Resources, Guangzhou 510075, China

Received Date: 2008-01-24
Rev Recd Date: 2009-01-12

Abstract

Abstract

Complicated authigenic minerals were identified by XRD and SEM in the study sediment samples from the southern Qiongdong Basin, the northern South China Sea, such as miscellaneous carbonate, sulphate and fram biodal pyrite, which consistently indicate the gas hydrate and methane seep to occur in the area.The assem blage and fabric features are similar to those being found in cold-seep sediments, which are thought to be related to microorganisms fueled by dissolved methane.Results of chemical composition analysis in the pore water of the sediment samples show that the concent rations of SO₄^2-, Ca²⁺, Mg²⁺ and Sr²⁺ decrease clearly, and the concentration ratios of Mg²⁺ to Ca²⁺ and Sr²⁺ to Ca²⁺ increase sharply as the depth increases.These geochemical character istics are similar to chemical composition abnormalities in the pore water of the shallow sediments where the gas hydrate occurs in the world.Those results strongly indicate that there should be gas hydrates or deep water oil (gas) reservoirs underneath.
- authigenic minerals,
- methane seep,
- early diagenesis,
- southern Qiongdong Basin,
- gas hydrate

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References(57)

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