| 南海北部陆坡区水合物发育的水深、热流特征及盖层控制作用模拟 |
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| 引用本文： | 谭淋耘,于兴河,沙志彬,徐铫,苏丕波.南海北部陆坡区水合物发育的水深、热流特征及盖层控制作用模拟[J].海洋地质动态,2013(10):41-46. |
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| 作者姓名： | 谭淋耘 于兴河 沙志彬 徐铫 苏丕波 |
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| 作者单位： | [1]国土资源部页岩气资源与勘查技术重点实验室重庆地质矿产研究院,重庆400042 [2]重庆市页岩气资源与勘查工程技术研究中心重庆地质矿产研究院,重庆400042 [3]油气资源与探测国家重点实验室重庆页岩气研究中心,重庆400042 [4]中国地质大学北京能源学院,北京100083 [5]广州海洋地质调查局,广州510760 |
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| 基金项目： | 重庆市自然科学基金（CSTC2012JJB9007） |
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| 摘 要： | 南海北部陆坡区是中国最具潜力的天然气水合物聚集区。通过对研究区似海底反射层（BSR）、水深及热流值分布进行交会，得到了水深、热流双因素对天然气水合物形成的共同控制机理。研究认为，热流值中等（70～83mW／m^2）的地区最有利于天然气水合物的形成和聚集，热流值升高，天然气水合物形成的水深有总体增大的趋势。另外，天然气水合物的形成也需要良好的盖层条件。模拟了当上覆泥质沉积物盖层厚度不同时，天然气水合物形成所需的最低水深，并对不同泥质沉积物盖层厚度对天然气水合物稳定带底界面和厚度的影响做了研究和探讨。当泥质沉积物盖层的厚度越大时，天然气水合物形成的水深可以更浅；当泥质沉积物盖层厚度较小时，天然气水合物的形成则需要更大的水深。另外，当水深越大时，天然气水合物稳定带的底界面（BGHSZ）越深，天然气水合物稳定带的厚度越大。
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| 关 键 词： | 南海 天然气水合物 热流值 水深 盖层 |
WATER DEPTH,HEAT FLOW AND CAP ROCK CONTROL ON GAS HYDRATE FORMATION： A CASE FROM THE NORTHERN CONTINENTAL SLOPE OF SOUTH CHINA SEA |
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| TAN Linyun,YU Xinghe,SHA Zhibin,XU Yao,SU Pibo.WATER DEPTH,HEAT FLOW AND CAP ROCK CONTROL ON GAS HYDRATE FORMATION： A CASE FROM THE NORTHERN CONTINENTAL SLOPE OF SOUTH CHINA SEA[J].Marine Geology Development,2013(10):41-46. |
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| Authors: | TAN Linyun YU Xinghe SHA Zhibin XU Yao SU Pibo |
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| Institution: | 1 Key Laboratory for Shale Gas Resource and Exploration, Ministry of Land and Resources, Chongqing Institute of Geology and Mineral Resources, Chongcling 400042, China; 2 Chongqing Engineering Research Center for Shale Gas Resource and Exploration, Chongqing Institute of Geology and Mineral Resources, Chongding 400042, China; 3 Chongqing Shale Gas Research Center, State Key Laboratory of Petroleum Resource and Prospecting, Chongqing 400042, China ;4 School of Energy Resources, China University of Geosciences (Beijing), Beijing 100083, China; 5 Guangzhou Marine Geological Survey, Guangzhou 510760, Guangdong, China ) |
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| Abstract: | The northern continental slope of South China Sea is one of the most favorable areas for gas hydrate accumulation in this region. This paper deals with the control of water depth and heat flow o- ver gas hydrate formation through the studies of the relationship among the bottom-simulating reflec- tors （BSRs）, water depth and heat flow. Results show that the moderate heat flow area （70-83 mW/m^2） is the most favorable for gas hydrate formation, and the water will become too deep if the heat flow increases. The cap rock is another factor, which plays important role. We discussed in this paper the lowest limit of water depth under different thicknesses of overlying cap rocks. The influence of cap rock thickness is obvious on the base of the gas hydrate stability zone and its thickness. With the water depth increases, the base of the gas hydrate stability zone （BGHSZ） becomes deeper and the thickness of the zone larger. |
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| Keywords: | South China Sea gas hydrate heat flow water depth cap rock |
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