| 海洋天然气水合物发育顶界的模拟计算 |
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| 引用本文： | 曹运诚,陈多福.海洋天然气水合物发育顶界的模拟计算[J].地球物理学报,2014,57(2):618-627. |
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| 作者姓名： | 曹运诚 陈多福 |
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| 作者单位： | 1. 中国科学院南海海洋研究所边缘海地质重点实验室, 广州 510301;
2. 中国科学院广州地球化学研究所边缘海地质重点实验室, 广州 510640 |
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| 基金项目： | 中国科学院国际重大合作项目(KZCX2-YW-GJ03);国家自然科学基金(91228206,41306044,41276057);广州地球化学研究所135项目(Y234021001)资助 |
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| 摘 要： | 天然气水合物顶界的确定对于其资源评价十分重要，但目前还没有很好的方法来确定.本文利用在甲烷-硫酸根（SMI）界面硫酸根与甲烷所消耗的量相等和水-天然气水合物二相体系甲烷溶解度模型，建立了水合物顶界埋深计算的数学模型，并考虑硫酸根氧化有机质和微生物原位甲烷生成的影响.计算的ODP1245和IODP1327站位水合物顶界埋深分别为53 mbsf和83 mbsf，与钻探获得的水合物顶界埋深相吻合.
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| 关 键 词： | 硫酸根浓度剖面 甲烷-硫酸根界面 甲烷通量 水合物顶界 数值模型 |
| 收稿时间： | 2013-06-13 |
Modeling calculation of top occurrence of marine gas hydrates |
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| CAO Yun-Cheng;CHEN Duo-Fu.Modeling calculation of top occurrence of marine gas hydrates[J].Chinese Journal of Geophysics,2014,57(2):618-627. |
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| Authors: | CAO Yun-Cheng;CHEN Duo-Fu |
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| Institution: | 1. CAS Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
2. CAS Key Laboratory of Marginal Sea Geology, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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| Abstract: | A major problem in evaluation of gas hydrate resources is lack of a reliable technique to constrain the top occurrence of gas hydrates. We have developed a numerical model of the top occurrence of gas hydrates based on that the depleted quantity of sulfate diffusion downward equals to that of methane flux upward at sulfate-methane interface (SMI) and the methane solubility in the water-hydrate system, using steady state and analytical expressions. In situ methane production and sulfate depletion associated with the oxidation of sedimentary organic matter were considered in the model. We applied this model to ODP site 1245 and IODP site 1327, and calculated the top of gas hydrate occurrence at these two sites, yielding 53 mbsf, 83 mbsf, respectively, which are consistent with the top depth estimated by drilling. |
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| Keywords: | Sulfate profile Sulfate-methane interface Methane flux Top occurrence of gas hydrate Numerical model |
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