天然气水合物分解对地层稳定性影响的离心机实验模拟

• 作 者: 张旭辉 胡光海 鲁晓兵
• 机 构: 中国科学院力学研究所,国家海洋局第一海洋研究所,
• 出 处: 实验力学
• 发表日期: 2012年03期
• 关键词: 水合物分解 天然气水合物 海床稳定性 实验模拟 离心机实验 地层 海床 孔隙压力 地层变形 沉积物

水合物分解后将引起地层强度的降低,可能造成海床沉陷、滑塌以及海洋结构物基础的破坏。针对该问题,首先以南海浅层粉砂为沉积物骨架,采用生物厌氧发酵技术合成水合物沉积物,然后进行水合物热分解引起地层响应的离心机实验模拟,获得了水合物分解引起地层变形与滑塌的特征以及孔隙压力发展的物理过程,为研究水合物分解引起海床失稳的条件进行了新的尝试。

Decomposition of hydrate will cause the formation to reduce the strength, may cause seabed subsidence, landslides and the destruction of marine infrastructure. In order to solve this problem, firstly, the South China Sea shallow silt was used as sediment skeleton, bio-anaerobic fermentation was used to synthesize hydrate sediments, and then centrifuge experiments were carried out to simulate the formation response caused by hydrate thermal decomposition. The characteristics of deformation and slump as well as the physical process of pore pressure development have made new attempts to study the conditions of the seafloor instability caused by hydrate decomposition.