南海东北部陆坡区天然气水合物成矿作用

现代地质 ›› 2011, Vol. 25 ›› Issue (2): 340-348.

南海东北部陆坡区天然气水合物成矿作用

杨木壮^1,2,沙志彬^3,4,梁金强⁴,王宏斌⁴,光学⁴

1.国土资源部海洋油气资源与环境地质重点实验室，山东青岛266071；2广州大学地理科学学院，广东广州510006；
3.中国地质大学资源学院，湖北武汉430074；4广州海洋地质调查局，广东广州510760

出版日期:2011-04-25 发布日期:2011-05-13
作者简介:杨木壮，男，博士，教授,1965年出生，矿产普查与勘探海洋专业，主要从事国土资源与自然地理研究。 Email:yangmz@21cn.net。
基金资助:
国家自然科学基金项目(40746028);国土资源部海洋油气资源与环境地质重点实验室项目(MRE200911); 国土资源部公益性行业科研专项项目(200811014);国家重点基础研究发展计划项目(2009CB219502)。

Metallogenetic Conditions of Gas Hydrate in the Northeastern Slope of the South China Sea

YANG Mu-Zhuang^1,2,SHA Zhi-Bin^3,4,LIANG Jin-Qiang⁴,WANG Hong-Bin⁴,ZHANG Guang-Hua⁴

1.Key Laboratory of Marine Hydrocarbon Resources and Enviromental Geology, Ministry of Land and Resources, Qingdao,Shandong266071,China;
2.School of Geographical Sciences，Guangzhou University, Guangzhou, Guangdong510006, China；
3.Faculty of Resources，China University of Geosciences，Wuhan, Hubei430074,China；
4.Guangzhou Marine Geological Survey, Guangzhou,Guangdong510760,China

Online:2011-04-25 Published:2011-05-13

摘要/Abstract

摘要：

南海东北部陆坡区具有准被动大陆边缘构造特征，新生代含油气沉积盆地发育，具备天然气水合物发育的一系列有利地质构造背景。基于该区已有的调查资料，从构造、沉积、成矿气体来源和水合物相平衡及其热力学特征等方面，综合分析了南海东北陆坡区有利的天然气水合物成矿条件。结果表明，研究区完全具备形成水合物的海底温度、地温梯度和压力条件，存在底辟和泥火山构造、斜坡-断层构造组合等特殊地质构造环境及构造部位，浅部沉积层具有合适的岩石学条件和较高的沉积速率，并存在丰富的生物气和热解气。因此，南海东北部陆坡区具有潜力极大的天然气水合物成矿远景。

关键词: 天然气水合物, 含油气盆地, 成矿条件, 南海东北部陆坡

Abstract:

The northeastern slope of the South China Sea has the characteristics of the passive continental margin in Cenozoic and has many oil and gas bearing basins. As a result, the geological and tectonic settings, the temperature and pressure conditions, and the methane-generating potential from the thick organic-rich sediments are all favorable for gas hydrate formation. Through the studies of structure, deposit, gas sources, gas hydrate phase equilibrium and thermodynamic conditions, this paper discussed the favorable situations for gas hydrate formation in the northeastern slope of the South China Sea. The results show that the seafloor temperature, geothermal gradient and stress conditions are favorable for gas hydrate forming; there are special tectonic settings, such as diaper, mud volcano, and slope-fault structure combination; the shallow layers have suitable lithological characteristics and high deposition rate; there are abundant biodegradation gas and thermal-genetic gas. Therefore it comes to the conclusion that the study area is a hydrate prospective area.

Key words: natural gas hydrate, hydro carbon-bearing basin, metallogenic condition, northeastern slope of the South China Sea

中图分类号:

杨木壮,沙志彬,梁金强,王宏斌,张光学. 南海东北部陆坡区天然气水合物成矿作用[J]. 现代地质, 2011, 25(2): 340-348.

YANG Mu-Zhuang,SHA Zhi-Bin,LIANG Jin-Qiang,WANG Hong-Bin,ZHANG Guang-Hua. Metallogenetic Conditions of Gas Hydrate in the Northeastern Slope of the South China Sea[J]. Geoscience, 2011, 25(2): 340-348.

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