DISTRIBUTION PATTERN OF SEAFLOOR THERMAL CONDUCTIVITIES AT THE DRILLING AREA FOR GAS HYDRATE ON THE NORTHEASTERN SLOPE OF SOUTH CHINA SEA

WANG Lifeng; SHANG Jiujing; LIANG Jinqiang; XU Xing; SHA Zhibin; LU Jing; WANG Jingli

doi:10.16562/j.cnki.0256-1492.2016.02.004

2016 Vol. 36, No. 2

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WANG Lifeng, SHANG Jiujing, LIANG Jinqiang, XU Xing, SHA Zhibin, LU Jing, WANG Jingli. DISTRIBUTION PATTERN OF SEAFLOOR THERMAL CONDUCTIVITIES AT THE DRILLING AREA FOR GAS HYDRATE ON THE NORTHEASTERN SLOPE OF SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2016, 36(2): 29-37. doi: 10.16562/j.cnki.0256-1492.2016.02.004

Citation:

WANG Lifeng, SHANG Jiujing, LIANG Jinqiang, XU Xing, SHA Zhibin, LU Jing, WANG Jingli. DISTRIBUTION PATTERN OF SEAFLOOR THERMAL CONDUCTIVITIES AT THE DRILLING AREA FOR GAS HYDRATE ON THE NORTHEASTERN SLOPE OF SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2016, 36(2): 29-37. doi: 10.16562/j.cnki.0256-1492.2016.02.004

DISTRIBUTION PATTERN OF SEAFLOOR THERMAL CONDUCTIVITIES AT THE DRILLING AREA FOR GAS HYDRATE ON THE NORTHEASTERN SLOPE OF SOUTH CHINA SEA

1. Guangzhou Marine Geological Survey, Guangzhou, Guangdong, 510075;
2. Key Laboratory of Marine Mineral Resources, Ministry of Land and Resources, Guangzhou, Guangdong, 510075

Received Date: 22 July 2015

Revised Date: 21 October 2015

Abstract

Abstract

We investigated thermal conductivity, mineral composition, grain size and geomorphy of seafloor sediments and their variations in the drilling area on the northeastern slope of South China Sea using the thermal conductivities and multi-beam data as tools. Data reveals that the thermal conductivities of seafloor sediments are 1.26±0.12 W/(m·k) higher than the background values on average, possibly due to deposition of terrigenous turbidites and methane related high-thermal-conductivity carbonate deposits. The detailed distribution pattern of the thermal conductivities is interesting. The thermal conductivities as high as 1.32±0.06 W/(m·k) and 1.34±0.06 W/(m·k) are discovered in the areas of No. 2 and No. 5 respectively on the submarine platforms where large area is deposited by coarse grained carbonate due to bottom current denudation. Thermal conductivities as low as 1.10±0.06 W/(m·k) and 1.01±0.06 W/(m·k) are found in the typical submarine troughs of No. 1 and No. 8 areas respectively attributing to the compaction of fine grained deposits avalanched from the submarine plateaus. The seafloor sediments thermal conductivity at the drilling area decreases from the central plateaus to the peripheral troughs, probably owing to the chemical composition of highly migrating fluid under the control of endogenic process and the grain size decrease up to geomorphic changes under the control of the exogenic process.
- northeastern slope of South China Sea /
- natural gas hydrate /
- thermal conductivity /
- mineral composition /
- grain size /
- geomorphy

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References

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