摘要
天然气水合物被认为是大陆边缘沉积物强度变弱的一个因子,从而能解释大陆边缘海底滑坡的一些观测现象.天然气水合物的形成使沉积物强度增加,而其分解则使沉积物强度变弱.虽然无法直接观测沉积物中天然气水合物的活动过程与相应的海底滑坡,大量的背景资料表明,天然气水合物崩解常常有助于触发海底沉积物块体的运动.此外,大型滑塌可以释放大量的固态天然气水合物,水合物在水柱中上浮.大块天然气水合物可以在分解前到达海洋的上部层,一些甲烷可以直接进入大气中.本文综述与天然气水合物体系演化有关的海底滑坡的研究现状.
Gas hydrate decomposition is hypothesized to be a factor in generating weakness in continental margin sediments that may explain some phenomena of submarine slides on continental margin. The formation of gas hydrate can cause the strengthening of sediments, and the decomposition of gas hydrate can result in the weakening of sediments. Although gas hydrate active processes within the sediments and associated seafloor slides are impossible to directly observe, a number of evidences suggests that gas hydrate breakdown often helps to trigger sediment mass movement on the seafloor. Moreover,large submarine slides could release volumetrically significant quantities of solid gas hydrates which would float upwards in the water column. Large pieces of gas hydrate would reach the upper layers of the ocean before decomposing, and some of the methane would be directly injected into the atmosphere. Researches on submarine slides, which may be related with gas hydrate system evolution, are summarized.
出处
《地球物理学进展》
CSCD
2003年第3期503-511,共9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
中国科学院知识创新工程项目(KZCX3 SW 219)
国家重点基础研究发展规划项目(G20000467).
关键词
天然气水合物体系
动态演化
海底滑坡
沉积物强度
地质灾害
Gas hydrate system, Dynamic evolution, Submarine slides, Sediment strength, Geological disaster
