Gas sources and its implications for hydrate accumulation in the eastern Pearl River Mouth Basin

SHA Zhibin; XU Zhenqiang; FU Shaoying; LIANG Jinqiang; ZHANG Wei; SU Pibo; LU Hongfeng; LU Jing'an

doi:10.16562/j.cnki.0256-1492.2019010902

2019 Vol. 39, No. 4

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Article navigation > Marine Geology & Quaternary Geology > 2019 > 39(4): 116-125

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SHA Zhibin, XU Zhenqiang, FU Shaoying, LIANG Jinqiang, ZHANG Wei, SU Pibo, LU Hongfeng, LU Jing'an. Gas sources and its implications for hydrate accumulation in the eastern Pearl River Mouth Basin[J]. Marine Geology & Quaternary Geology, 2019, 39(4): 116-125. doi: 10.16562/j.cnki.0256-1492.2019010902

Citation:

SHA Zhibin, XU Zhenqiang, FU Shaoying, LIANG Jinqiang, ZHANG Wei, SU Pibo, LU Hongfeng, LU Jing'an. Gas sources and its implications for hydrate accumulation in the eastern Pearl River Mouth Basin[J]. Marine Geology & Quaternary Geology, 2019, 39(4): 116-125. doi: 10.16562/j.cnki.0256-1492.2019010902

Gas sources and its implications for hydrate accumulation in the eastern Pearl River Mouth Basin

1.
China University of Geosciences(Wuhan), Wuhan 430074, China
2.
MNR Key Laboratory of Marine Mineral Resources, Guangzhou Marine Geological Survey, Guangzhou 510760, China
3.
China Geological Survey, Beijing 100037, China

Received Date: 09 January 2019

Revised Date: 11 April 2019

Publish Date: 28 August 2019

Abstract

Abstract

Pressure cores and void gas samples are collected by drilling from target layers at five coring sites in the eastern Pearl River Mouth Basin. Dissociation gas is also sampled in thirteen layers, while headspace gas samples acquired at all the five sites. All gas samples have been tested for chemical and isotopic compositions. The gas is methane dominated, which is up to 96.5%~99.8% in concentration. Trace amount of ethane is also detected in concentration of (175~554)×10^-6. No C₂₊ hydrocarbons have been found in all the gas samples. The isotopes of carbon and hydrogen of the methane suggest that δ¹³C₁ is in the range of -68.4‰~-71.2‰, with δDC₁ from -182‰ to -184‰, indicating a biogenic origin. The gas source of hydrate is not directly related to the occurrence of hydrate, while hydrate with multiple sources seems closely related to the evolution and morphological characteristics of reservoir. The main gas source area is located in the shallow strata less than 1000m in depth, suggesting that the hydrocarbon has migrated to the favorable stability zone to form gas hydrate accumulation by shallow lateral migration.
- natural gas hydrate /
- gas source /
- genetic type /
- biogenic gas /
- eastern Pearl River Mouth Basin

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References

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