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天然气水合物赋存区甲烷渗漏活动的地球化学响应特征
程俊, 王淑红
中国科学院南海海洋研究所边缘海与大洋地质重点实验室
摘要:
如何通过识别甲烷渗漏活动寻找天然气水合物资源一直是水合物勘探的重要研究方向,地球化学方法是识别甲烷渗漏最有效的手段之一,因此,对天然气水合物赋存区甲烷渗漏活动的地球化学响应指标进行研究具有重要的科学意义。本文在综合分析甲烷渗漏活动地球化学响应特征基础上,建议利用浅表层沉积物孔隙水中CH4、H2S及SO42-、Cl-、NH4+、PO43-等离子浓度随深度的变化;浅层沉积物中TOC和TS之间的相关性及比值;自生碳酸盐岩的δ13C和δ18O值;重晶石、黄铁矿、自生石膏的δ34S值;有孔虫壳体和生物标志化合物的δ13C值等多指标的综合分析来识别甲烷渗漏活动。随着孔隙水流体数值模拟、非传统稳定同位素(如Fe、Ca、Mg、Ba)和沉积物微量元素研究的发展,甲烷渗漏活动地球化学响应指标的研究也将得到拓展,可为天然气水合物勘探及其形成分解过程识别研究提供重要的科学依据。
关键词:  天然气水合物  甲烷渗漏  地球化学响应特征
DOI:10.11759/hykx20180426001
分类号:P59
基金项目:
Geochemical Response Characteristics of Methane Seepage Activities in Gas Hydrate Zone
chengjun, Wang Shuhong
Key Laboratory of Ocean and Marginal Sea Geology,South China Sea Institute of Oceanology, Chinese Academic of Sciences
Abstract:
How to discover gas hydrate resources by identifying methane leakage activities has been an important research focus for gas hydrate exploration, and geochemical methods are one of the most effective means of identifying methane seepage. This tendency gives importance profundity to geochemical response indicators of methane seepage activities in gas hydrate zone. In this paper, based on comprehensive analysis geochemical response characteristics of methane leakage activities, we suggest that the changing concentration of CH4, H2S, SO42-, Cl-, NH4+, PO43- of pore water in seafloor shallow surface sediments with depth; correlations and ratios between sedimentary total organic carbon (TOC) and sedimentary total sulfur (TS); δ13C and δ18O values of authigenic carbonates; δ34S values of barite, pyrite and authigenic gypsum; and δ13C values of benthic foraminifera shells and biomarkers can be used comprehensively to identify methane leakage activities. With the development of numerical models of pore water fluids, non-traditional stable isotopes such as Fe, Ca, Mg, Ba and trace elements in sediments, the study of geochemical response indicators for methane seepage activities will also be expanded in the future. Ultimately, the combined geochemical indicators study of methane seepage will provide a valuable tool with which to explore gas hydrate and understand its formation and decomposition processes.
Key words:  Gas Hydrate  Methane Seepage  Geochemical Response Characteristics
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