摘要
由于双似海底反射可望指示一个动态演化的天然气水合物 游离气体系特征,这一重要问题的研究非常有意义.目前在世界上有两个双似海底反射分布区最为典型,一是挪威西部大陆边缘,另一个为东南海海槽大陆边缘.对双BSR的解释,主要有两种,一种是残留BSR,对应古温压条件下天然气水合物稳定带底界的反射,另一种是混合气体水合物沉积的底界反射.阐明双似海底反射层空间分布特征与其成因,建立动态演化的天然气水合物-天然气体系模型,可为深入了解天然气水合物形成机制、分布规律及其地质历史中的演变提供重要的科学基础.
Researches on double bottom simulating reflections(double BSRs) are very important because they may indicate the characteristics of dynamic evolution of gas hydratefree gas system. By now there are two typical double BSR distribution regions, one is western Norwegian margin and the other is eastern Nankai Trough margin. Usually there are two potential explanations for the double BSR. First, it can be explained to be a relict gashydrate BSR, a reflection from the base of gas hydrate stability zone of a paleo set of pressure and temperature conditions. Second, it can be explained to be a reflection from the base of gas hydrate bearing sediments with a mixture gas composition. It will provide critical information for better understanding of gas hydrate formation mechanism, its distribution law and evolution in geological history to study spatial distribution characteristics and the origin of double BSR and set up model of dynamic evolving gas hydratefree gas system.
出处
《地球物理学进展》
CSCD
2003年第3期497-502,共6页
Progress in Geophysics
基金
中国科学院全国优秀博士学位论文专项资金
国家重点基础研究发展规划项目(G20000467)
中国科学院知识创新工程项目(KZCX3 SW 219).
