BIT INDEX FOR SOURCE AND INPUT IDENTIFICATION OF THE GAS-HYDRATE LAYER AT SH7B STATION IN SHENHU AREA, SOUTH CHINA SEA

XIONG Ping; FU Shaoying; JIANG Linxiang; LU Hong

doi:10.3724/SP.J.1140.2015.01129

Marine Geology & Quaternary Geology > 2015 > 35(1): 129-134. > DOI: 10.3724/SP.J.1140.2015.01129

XIONG Ping, FU Shaoying, JIANG Linxiang, LU Hong. BIT INDEX FOR SOURCE AND INPUT IDENTIFICATION OF THE GAS-HYDRATE LAYER AT SH7B STATION IN SHENHU AREA, SOUTH CHINA SEA[J]. Marine Geology & Quaternary Geology, 2015, 35(1): 129-134. DOI: 10.3724/SP.J.1140.2015.01129

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BIT INDEX FOR SOURCE AND INPUT IDENTIFICATION OF THE GAS-HYDRATE LAYER AT SH7B STATION IN SHENHU AREA, SOUTH CHINA SEA

1. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy, Guangzhou 510640;

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Received Date: March 23, 2014
Revised Date: May 17, 2014

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Abstract

Gas hydrate is very different from cold seep carbonate. There have been a lot of researches on cold seep carbonate in the South China Sea. This paper is devoted to the GDGTs of the coring samples from the Shenhu area and its implication for the origin, biogenetic source and AOM of gas hydrates. The results show that traditional indicators, such as TOC, δ¹³C value and C/N ratio, are not effective to the analysis the source of the cores from the SH7B station. The GDGTs of core samples from the interval of 96.5-225.2 m of SH7B station is mainly dominated by isoprenoid GDGTs. Relative content of branched GDGTs of sediments in gas-hydrate-bearing layer from 155-177 m increases more significantly than that in the layer without gas hydrate, while the relative percentage of isoprenoid GDGTs of the samples in gas-hydrate layer reduces significantly. BIT values further indicate that the sediments of gas-hydrate-bearing layer receive more terrestrial organic matter input than those of the non-hydrate layer. Previous studies documented that the northern South China Sea received a great amount of river deposits and monsoon input about 6Ma and led to the increase in terrestrial organic matter input in the sediments of hydrate bearing layer (6.0~6.74 Ma), as well as the increase in grain size and pore space. The input of coarser deposits may improve the reservoir property and form a favorable reservoir system in a coarsening upwards order, and thus provide a better reservoir for gas-hydrates accumulation in the Shenhu area.
- Shenhu area,
- BIT index,
- source,
- gas hydrate,
- terrigenous clastic input

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References

[1]	祝有海,张光学,卢振权, 等.南海天然气水合物成矿条件与找矿前景[J].石油学报,2001,22(5):6-10. [ZHU Youhai, ZHANG Guangxue, LU Zhenquan, et al. Gas hydrate in the South China Sea:background and indicators[J]. Acta Petrolei Sinica, 2001, 22(5):6-10.]
[2]	蒲晓强,陶小晚, 张会领.南海北部陆坡天然气水合物存在的地球物理和地球化学特征[J].天然气地球科学,2009,20(4):620-626. [PU Xiaoqiang, TAO Xiaowan, ZHANG Huiling. Geophysical and geochemical characters of natural gas hydrate occurrence in northern continental slope of South China Sea[J]. Natural Gas Geoscience, 2009, 20(4):620-626.]
[3]	付少英,陆敬安.神狐海域天然气水合物的特征及其气源[J].海洋地质动态, 2010,26(9):6-10. [FU Shaoying, LU Jingan. The characteristics and origin of gas hydrate in Shenhu area, South China Sea[J]. Marine Geology Letters, 2010, 26(9):6-10.]
[4]	苏丕波,雷怀彦, 梁金强,等.神狐海域气源特征及其对天然气水合物成藏的指示意义[J].新能源,2010,30(10):103-108. [SU Pibo, LEI Huaiyan, LIANG Jinqiang, et al. Characteristics of gas source in the waters of Shenhu and their significance to gas hydrate accumulation[J]. New Energy, 2010, 30(10):103-108.]
[5]	陈芳,苏新,周洋.南海神狐海域水合物钻探区钙质超微化石生物地层及沉积速率[J].地球科学,2013,38(1):1-9. [CHEN Fang, SU Xin, ZHOU Yang. Late Miocene-Pleistocene Calcareous Nannofossil biostratigraphy of Shenhu gas hydrate drilling area in the South China Sea and variation in sedimentation rates[J]. Earth Science. 2013, 38(1):103-108.]
[6]	陈芳, 周洋, 苏新, 等.南海神狐海域含水合物层粒度变化及与水合物饱和度的关系[J].海洋地质与第四纪地质,2011,31(5):95-100. [CHEN Fang, ZHOU Yang, SU Xin, et al. Gas hydrate saturation and its relation with grain size of the hydrate-bearing sediments in the Shenhu area of northern South China Sea[J]. Marine Geology and Quaternary Geology. 2011, 31(5):95-100.]
[7]	梁劲,王明君,陆敬安,等.南海神狐海域含水合物底层测井相应特征[J].现代地质,2010,24(3):506-510. [LIANG Jin, WANG Mingjun, LU Jingan, et al. Logging response characteristics of gas hydrate formation in Shenhu area of the South China Sea[J].Geoscience, 2010, 24(3):506-510.]
[8]	Hopmans E C, Weijers J W H, Schefu E, et al. A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids[J]. Earth and Planetary Science Letters. 2004, 224(l-2):107-116.
[9]	Kim J H, Schouten S, Buscail R, et al. Origin and distribution of terrestrial organic matter in the NW Mediterranean (Gulf of Lions); Exploring the newly developed BIT index[J]. Geochemistry Geophysics Geosystems, 2006, 7(11):1-20.
[10]	Wejiers J W H, Schouten S, Linden M v d, et al. Water table related variations in the abundance of intact archaeal membrane lipids in a Swedish peat bog[J]. FEMS microbiology letters, 2004, 239:51-56.
[11]	赵美训, 高文献,邢磊,等.老黄口海区表层沉积有机质来源的BIT指标估算.海洋地质与第四纪地质.2011,31(4):29-36. [ZHAO Meixun, GAO Wenxian, XING Lei, et al. Estimates of the origins of organic matter in the old-Huanghe estuary using the BIT index[J]. Marine Geology and Quaternary Geology, 2011, 31(4):29-36.]
[12]	Weijers J W H, Schouten S, Shefu E, et al. Disentangling marine, soli and plant organic carbon contributions to continental margin sediment:A multi-proxy approach in a 20,000 year sediment record from the Congo deep-sea fan[J]. Geochimica et Cosmochimica Acta, 2009, 73:119-132.
[13]	Herfort L, Schouten S, Boon J P, et al. Characterization of transport and deposition of terrestrial organic matter in the southern North Sea using the BIT index[J]. Limnology and Oceanography, 2006, 51(5):2196-2205.
[14]	葛璐,蒋少涌,杨涛,等.南海北部神狐海域冷泉碳酸盐烟囱的甘油醚类生物标志[J].科学通报,2011,56(14):1124-1131. [GE L, JIANG Shaoyong, YANG Tao, et al. Glycerol ether biomarkers and their carbon isotopic compositions in a cold seep carbonate chimney from the Shenhu area, northern South China Sea[J]. Chinese Sci Bull, 2011, 56.(14):1124-1131.]
[15]	Hedges J I, Keil R G, Benner R. What happens to terrestrial organic matter in the ocean?[J]. Organic Geochemistry, 1997, 27(5-6):195-212.
[16]	Meyers P A. Organic geochemical proxies of paleo-oceanographic, paleo-climatologic and paleo-climatic processes[J]. Organic Geochemistry, 1997, 27(5-6):213-250.
[17]	贾国栋,彭平安.有机生物地球化学与晚新生代古全球变化研究[J].地学前缘,2005,12(2):179-187. [JIA Guodong, PENG Pingan. Organic biogeochemistry and past global change[J]. Earth Science Frontiers, 2005, 12(2):179-187.]
[18]	Hopmans E C, Schouten S.Pancost R D, et al. Analysis of intact tetraether lipids in archaeal cell material and sediments by high performance liquid chromatography/atmospheric pressure chemical ionization mass spectrometry[J]. Rapid Communications in Mass Spectrometry, 2000, 14:585-589.
[19]	卢政权,吴能友,陈建文,等.试论天然气水合物成藏系统[J].现代地质,2008,22(3):363-375. [LU Zhenquan, WU Nengyou, CHEN Jianwen, et al. Preliminary discussion on gas hydrate geological system[J].Geoscience, 2008, 22(3):363-375.]
[20]	万世明,李安春,Jan-Berend W. Stuut, 等.南海北部ODP1146站粒度揭示的近20Ma以来东亚季风演化[J].中国科学D辑,2007,37(6):761-770. [WANG Shiming, LI Anchun, Jan-Berend W Stuut. The revelation of east Asian monsoon evolution nearly 20 Ma by the granularity of the northern south ODP1146 station[J]. Chinese Science:Series D, 2007, 37(6):761-770.]

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BIT INDEX FOR SOURCE AND INPUT IDENTIFICATION OF THE GAS-HYDRATE LAYER AT SH7B STATION IN SHENHU AREA, SOUTH CHINA SEA

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