南海神狐海域有孔虫与高饱和度水合物的储存关系

陈芳; 苏新; 陆红锋; 周洋; 庄畅

doi:10.3799/dqkx.2013.089

Volume 38 Issue 5

Sep. 2013

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CHEN Fang, SU Xin, LU Hong-feng, ZHOU Yang, ZHUANG Chang, 2013. Relations between Biogenic Component (Foraminifera) and Highly Saturated Gas Hydrates Distribution from Shenhu Area, Northern South China Sea. Earth Science, 38(5): 907-915. doi: 10.3799/dqkx.2013.089

Citation:

CHEN Fang, SU Xin, LU Hong-feng, ZHOU Yang, ZHUANG Chang, 2013. Relations between Biogenic Component (Foraminifera) and Highly Saturated Gas Hydrates Distribution from Shenhu Area, Northern South China Sea. Earth Science, 38(5): 907-915. doi: 10.3799/dqkx.2013.089

Citation:

CHEN Fang, SU Xin, LU Hong-feng, ZHOU Yang, ZHUANG Chang, 2013. Relations between Biogenic Component (Foraminifera) and Highly Saturated Gas Hydrates Distribution from Shenhu Area, Northern South China Sea. Earth Science, 38(5): 907-915. doi: 10.3799/dqkx.2013.089

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Relations between Biogenic Component (Foraminifera) and Highly Saturated Gas Hydrates Distribution from Shenhu Area, Northern South China Sea

doi: 10.3799/dqkx.2013.089

CHEN Fang^{1, 2
,},
SU Xin³,
LU Hong-feng^{1, 2},
ZHOU Yang^{1, 2},
ZHUANG Chang^{1, 2}

1.
Guangzhou Marine Geological Survey, Guangzhou 510075, China
2.
Key Laboratory of Marine Mineral Resources of Ministry of Land and Resources, Guangzhou 510075, China
3.
School of Marine Geosciences, China University of Geosciences, Beijing 100083, China

Received Date: 2012-12-27
Publish Date: 2013-09-15

Abstract

Abstract

Based on studies of sedimentary features in the sediment interval containing high-saturation gas hydrate(HS-GHZ) in the Shenhu area, this paper presents results of Shenhu gas hydrates drilling site SH7B, at which HS-GHZ is observed at two major sediment intervals: between 155 and 166 m, and between 172 and 177 m. Our results suggest that the fine-grained sediments are foraminifera-contained clayey silt and silt; with very few siliceous microfossils. Two sediment intervals with high abundance of foraminifera coincide with two intervals of HS-GHZs, with high correlation coefficient up to 72%. Scanning electron microscope analysis on microstructure of sediments shows that existing of abundant sand-sized foramineral shells makes obvious contribution to the increase of sand fraction in these sediment intervals and shell-room space of foraminifers (intra-frame pore space) are significantly larger than pore space between silt-sized grains (inter-particle pore space). Only a few numbers of foraminiferal shell-rooms are filled with fine silt- or clay-sized grains or pyrites, suggesting slight influence of post-sedimentary diagenesis on foraminifera shells. In addition, shell-room spaces of foraminifers are generally in round-form with smooth pore-walls, which surely increases volume-containing capability in comparison with irregular and same diameter-sized inter-particle pore space. These evidences suggested that abundant foraminifers do not only increase in porosity of fine-grained sediments, but also provide high volume-containing capability of pore spaces for accumulating of gas hydrate in those two HS-GHZs at site SH7B. Furthermore, HS-GHZs are also well correlated to abundant foraminiferal intervals at two adjacent gas hydrates obtained sites, e.g.sites SH2B and SH3B, in the Shenhu area. All of these results lead to the assumption and explanation that a large portion of gas hydrates should be stored in shell-room spaces of abundant foraminifers in fine-grained sediment layers in Shenhu area, which are different from the results obtained by ODP gas hydrate drillings; and existence of abundant foraminifers is an important sedimentary factor for controlling accumulation and storage of high saturation of gas hydrates in Shenhu area.
- foraminifera,
- saturation,
- gas hydrates,
- sediments,
- South China Sea

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References(32)

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Relations between Biogenic Component (Foraminifera) and Highly Saturated Gas Hydrates Distribution from Shenhu Area, Northern South China Sea

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