底辟构造与天然气水合物的成矿关系  

The relationships between diapir structure and gas hydrate mineralization

作　　者：沙志彬[1] 王宏斌[1] 张光学[1] 杨木壮[2] 梁金强[2] 

机构地区：[1]广州海洋地质调查局,广东广州510760 [2]广州大学,广东广州510006

出　　处：《地学前缘》2005年第3期283-288,共6页Earth Science Frontiers

基　　金：国家重点基础研究发展规划项目(G2000046705)

摘　　要：世界上天然气水合物发现地区的地质构造特征研究表明,底辟构造和水合物的形成与聚集有较为密切的关系。底辟构造可能是地层内部圈闭气体由于压力释放上冲的结果,也可能是气体向上运移的通道。初步总结了被动大陆边缘中典型底辟构造与天然气水合物的成矿关系,认为被动陆缘内巨厚沉积层、塑性物质与高压流体、陆缘外侧的火山活动及张裂作用,为底辟构造发育提供了条件,形成了水合物成矿的有利空间。文中对南海底辟构造发育的地质背景进行了分析,并对南海天然气水合物的发育和赋存进行了预测。笔者在进行综合分析的基础上,对底辟构造中天然气水合物的成矿模式进行了进一步的分析和探讨。The research on the structure of diapirs in the area of gas hydrates show that there are close relationships between the form and accumulation of gas hydrates and the diapirs. The structure of diapirs can be regarded as the result of the pressure of inner gases upthrusted from the lower strata, and the migration of gases from deeper strata. The relationships between the accumulation of gas hydrates and the typical diapirs in passive continental margin are summarized in primary in this paper which suggest that the factors in passive continental margin including the thick sediment layers, plastic substance, high pressure fluid, outboard volcanic activities and the process of stretch-rupture provide favorable conditions for the formation of the diapirs which can form advantageous environment for gas hydrates coming into being. The background for the formation of the diapirs is analyzed and the existence of gas hydrates is predicted in South China Sea. Furthermore, the depositing model of gas hydrates in the structure of diapirs is construed in this paper.

关 键 词：底辟构造 天然气水合物 成矿作用 南海 

分 类 号：P618.13[天文地球—矿床学]