The distribution and variation in the gas composition of macro-seeps on the near-shore Lingtou Promontory in the South China Sea

DI Pengfei; FENG Dong; CHEN Duofu

doi:10.1007/s13131-016-0955-1

南海北部莺歌海岭头岬近岸烃类渗漏喷口分布及气体地球化学

doi: 10.1007/s13131-016-0955-1

1.
中国科学院南海海洋研究所边缘海地质重点实验室, 广东广州 510301
2.
中国科学院南海海洋研究所边缘海地质重点实验室, 广东广州 510301;上海深渊科学工程技术研究中心, 上海海洋大学海洋科学学院, 上海 201306

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- 收稿日期: 2015-08-05
- 修回日期: 2016-06-14

The distribution and variation in the gas composition of macro-seeps on the near-shore Lingtou Promontory in the South China Sea

1.
Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
2.
Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;Shanghai Engineering Research Center of Hadal Science and Technology, College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China

摘要

摘要: 烃类气体渗漏是海洋环境中甲烷等温室气体进入大气的一个重要来源。准确确定释放到大气中甲烷的量对全球碳循环与全球气候变化的影响有着重要的研究意义。莺歌海近岸海底分布着岭头岬、莺歌海河口、崖州湾和南山岬4个烃类渗漏活动区，并在海表面形成了一个近岸气泡带。本文通过对岭头岬渗漏区烃类渗漏喷口的空间分布与渗漏气泡的气体组成及其地球化学特征开展研究，发现岭头岬渗漏区渗漏的天然气气泡主要由CO₂、CH₄、N₂和少量的重碳烃气体组成，与上升至海表面的气泡中气体组成明显不同，由此可见渗漏的天然气气泡在上升过程中可能发生了气体交换作用。海底渗漏气泡中二氧化碳含量高（67.35%）与，δ¹³C_PDB比值为-0.49~0.86‰，表明二氧化碳是无机成因来源。而气泡中甲烷含量为23%，具有重δ¹³C_PDB比值（-34.43~-37.53‰），高的干燥指数（0.98~0.99），表明甲烷为热成因来源，可能来自于中央坳陷区梅山组烃源岩。在3.5赫兹高分辨率的浅层剖面上，岭头岬渗漏区烃类渗漏喷口呈线性排列分布，且近平行于1号断层，表明烃类渗漏喷口的形成可能与薄弱带或小断裂有关，烃类气体沿着侧向运移通道运移至近岸海底。
- 烃类渗漏 /
- 气体组成 /
- 分布 /
- 莺歌海近岸 /
- 南海北部
Abstract: Natural hydrocarbon seeps in a marine environment are one of the important contributors to greenhouse gases in the atmosphere, including methane, which is significant to the global carbon cycling and climate change. Four hydrocarbon seep areas, the Lingtou Promontory, the Yinggehai Rivulet mouth, the Yazhou Bay and the Nanshan Promontory, occurring in the Yinggehai Basin delineate a near-shore gas bubble zone. The gas composition and geochemistry of venting bubbles and the spatial distribution of hydrocarbon seeps are surveyed on the near-shore Lingtou Promontory. The gas composition of the venting bubbles is mainly composed of CO₂, CH₄, N₂ and O₂, with minor amounts of non-methane hydrocarbons. The difference in the bubbles' composition is a possible consequence of gas exchange during bubble ascent. The seepage gases from the seafloor are characterized by a high CO₂ content (67.35%) and relatively positive δ¹³C_V-PDB values (-0.49×10^-3-0.86×10^-3), indicating that the CO₂ is of inorganic origin. The relatively low CH₄ content (23%) and their negative δ¹³C_V-PDB values (-34.43×10^-3--37.53×10^-3) and high ratios of C₁ content to C_1-5 one (0.98-0.99) as well point to thermogenic gases. The hydrocarbon seeps on the 3.5 Hz sub-bottom profile display a linear arrangement and are sub-parallel to the No. 1 fault, suggesting that the hydrocarbon seeps may be associated with fracture activity or weak zones and that the seepage gases migrate laterally from the central depression of the Yinggehai Basin.
- hydrocarbon seeps /
- gas composition /
- distribution /
- nearshore Yinggehai /
- northern South China Sea

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参考文献(42)

Boetius A, Suess E. 2004. Hydrate Ridge:a natural laboratory for the study of microbial life fueled by methane from near-surface gas hydrates. Chemical Geology, 205(3-4):291-310

Bonini M. 2007. Interrelations of mud volcanism, fluid venting, and thrust-anticline folding:examples from the external northern Apennines (Emilia-Romagna, Italy). Journal of Geophysics Research, 112(B8):B08413

Campbell K A. 2006. Hydrocarbon seep and hydrothermal vent paleoenvironments and paleontology:past developments and future research directions. Palaeogeography, Palaeoclimatology, Palaeoecology, 232(2-4):362-407

Clark J F, Leifer I, Washburn L, et al. 2003. Compositional changes in natural gas bubble plumes:observations from the Coal Oil Point marine hydrocarbon seep field. Geo-Marine Letters, 23(3-4):187-193

Clark J F, Washburn L, Hornafius J S, et al. 2000. Dissolved hydrocarbon flux from natural marine seeps to the southern California Bight. Journal of Geophysical Research:Oceans, 105(C5):11509-11522

Clark J F, Washburn L, Schwager Emery K. 2010. Variability of gas composition and flux intensity in natural marine hydrocarbon seeps. Geo-Marine Letters, 30(3-4):379-388

Di Pengfei, Chen Qinghua, Chen Duofu. 2012. in situ on-line measuring device of gas seeping flux at marine seep sites and experimental study. Journal of Tropical Oceanography (in Chinese), 31(5):83-87

Di Pengfei, Feng Dong, Chen Doufu. 2014a. in situ and on-line measurement of gas flux at a hydrocarbon seep from the northern South China Sea. Continental Shelf Research, 81:80-87

Di Pengfei, Feng Dong, Chen Duofu. 2014b. Temporal variation in natural gas seep rate and influence factors in the Lingtou Promontory seep field of the northern South China Sea. Terrestrial Atmospheric and Oceanic Sciences, 25(5):665-672

Dimitrov L I. 2003. Mud volcanoes-a significant source of atmospheric methane. Geo-Marine Letters, 23(3-4):155-161

Etiope G. 2009. Natural emissions of methane from geological seepage in Europe. Atmospheric Environment, 43(7):1430-1443

Etiope G, Lassey K R, Klusman R W, et al. 2008. Reappraisal of the fossil methane budget and related emission from geologic sources. Geophysical Research Letters, 35(9):L09307

Etiope G, Milkov A V. 2004. A new estimate of global methane flux from onshore and shallow submarine mud volcanoes to the atmosphere. Environmental Geology, 46(8):997-1002

Forrest M J, Ledesma-Vázquez J, Ussler W, et al. 2005. Gas geochemistry of a shallow submarine hydrothermal vent associated with the El Requesón fault zone, Bahía Concepción, Baja California Sur, México. Chemical Geology, 224(1-3):82-95

Huang B J, Xiao X M, Dong W L. 2002. Multiphase natural gas migration and accumulation and its relationship to diapir structures in the DF1-1 gas field, South China Sea. Marine and Petroleum Geology, 19(7):861-872

Huang Baojia, Xiao Xianming, Hu Zhongliang, et al. 2005. Geochemistry and episodic accumulation of natural gases from the Ledong gas field in the Yinggehai Basin, offshore South China Sea. Organic Geochemistry, 36(12):1689-1702

Huang Baojia, Xiao Xianming, Li Xuxuan. 2003. Geochemistry and origins of natural gases in the Yinggehai and Qiongdongnan basins, offshore South China Sea. Organic Geochemistry, 34(7):1009-1025

Huang Baojia, Xiao Xianming, Li Xushen, et al. 2009. Spatial distribution and geochemistry of the nearshore gas seepages and their implications to natural gas migration in the Yinggehai Basin, offshore South China Sea. Marine and Petroleum Geology, 26(6):928-935

Huang Baojia, Xiao Xianming, Zhu Weilin. 2004. Geochemistry, origin, and accumulation of CO₂ in natural gases of the Yinggehai Basin, offshore South China Sea. AAPG Bulletin, 88(9):1277-1293

Judd A G. 2003. The global importance and context of methane escape from the seabed. Geo-Marine Letters, 23(3-4):147-154

Judd A G. 2004. Natural seabed gas seeps as sources of atmospheric methane. Environmental Geology, 46(8):988-996

Judd A G, Hovland M. 2007. Seabed Fluid Flow:The Impact on Geology, Biology and the Marine Environment. Cambridge:Cambridge University Press

Judd A G, Hovland M, Dimitrov L I, et al. 2002. The geological methane budget at continental margins and its influence on climate change. Geofluids, 2(2):109-126

Knipe R J. 1997. Juxtaposition and seal diagrams to help analyze fault seals in hydrocarbon reservoirs. AAPG Bulletin, 81(2):187-195

Kopf A J. 2002. Significance of mud volcanism. Reviews of Geophysics, 40(2):1005

Leifer I, Clark J. 2002. Modeling trace gases in hydrocarbon seep bubbles. Application to marine hydrocarbon seeps in the Santa Barbara Channel. Russian Journal of Geology and Geophysics, 43(7):613-321

Leifer I, Clark J F, Chen R F. 2000. Modifications of the local environment by natural marine hydrocarbon seeps. Geophysical Research Letters, 27(22):3711-3714

Leifer I, Kamerling M J, Luyendyk B P, et al. 2010. Geologic control of natural marine hydrocarbon seep emissions, Coal Oil Point seep field, California. Geo-Marine Letters, 30(3-4):331-338

Leifer I, Patro R K. 2002. The bubble mechanism for methane transport from the shallow sea bed to the surface:a review and sensitivity study. Continental Shelf Research, 22(16):2409-2428

Liao Fengrong, Wu Xiaoqi, Huang Shiping. 2010. Geochemical characteristics of natural gas in the Yinggehai-Qiongdongnan Basin, South China Sea. Energy, Exploration & Exploitation, 28:1-12

MacDonald I R, Buthman D B, Sager W W, et al. 2000. Pulsed oil discharge from a mud volcano. Geology, 28(10):907-910

McGinnis D F, Greinert J, Artemov Y, et al. 2006. Fate of rising methane bubbles in stratified waters:how much methane reaches the atmosphere? Journal of Geophysical Research, 111(C9):C09007

Naudts L, Greinert J, Artemov Y, et al. 2006. Geological and morphological setting of 2778 methane seeps in the Dnepr paleo-delta, northwestern Black Sea. Marine Geology, 227(3-4):177-199

Orange D L, Greene H G, Reed D, et al. 1999. Widespread fluid expulsion on a translational continental margin:mud volcanoes, fault zones, headless canyons, and organic-rich substrate in Monterey Bay, California. Geological Society of America Bulletin, 111(7):992-1009

Reeburgh W S. 2003. Global methane biogeochemistry. In:Keeling R, ed. Treatise on Geochemistry, Vol. 4. The Atmosphere. Oxford:Elsevier, 65-69

Reeburgh W S. 2007. Oceanic methane biogeochemistry. Chemical Reviews, 107(2):486-513

Schoell M. 1980. The hydrogen and carbon isotopic composition of methane from natural gases of various origins. Geochimica et Cosmochimica Acta, 44(5):649-661

Talukder A R. 2012. Review of submarine cold seep plumbing systems:leakage to seepage and venting. Terra Nova, 24(4):255-272

Tissot B P, Welte D H. 1984. Petroleum Formation and Occurrence. znd ed.Berlin:Springer-Verlag

Xie Xinong, Li Sitian, Dong Weiliang, et al. 2001. Evidence for episodic expulsion of hot fluids along faults near diapiric structures of the Yinggehai Basin, South China Sea. Marine and Petroleum Geology, 18(6):715-728

Zhang Youxue. 2003. Methane escape from gas hydrate systems in marine environment, and methane-driven oceanic eruptions. Geophysical Research Letters, 30(7):1398

Zhang Qiming, Liu Funing, Yang Jihai. 1996. Overpressure system and hydrocarbon accumulation in the Yinggehai Basin. China Offshore Oil and Gas (Geology) (in Chinese), 10(2):65-75

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南海北部莺歌海岭头岬近岸烃类渗漏喷口分布及气体地球化学

doi: 10.1007/s13131-016-0955-1

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出版历程

The distribution and variation in the gas composition of macro-seeps on the near-shore Lingtou Promontory in the South China Sea

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出版历程

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