摘要
天然气水合物是一种战略性替代能源。同时,开发天然气水合物将是全球气候环境问题和地质灾害的诱发因素之一。含天然气水合物沉积物(简称HBS)的相平衡问题对天然气水合物资源勘探、评估与开发利用以及环境影响均具有重要的基础作用。自然界中赋存于沉积物之中的天然气水合物的生成与分解与纯水体系中水合物的生成与分解具有很大区别。通过总结国内外研究资料,以天然气水合物开发利用中的岩土工程问题研究需要为出发点,详细介绍了HBS的沉积物物性、孔隙水盐度和气体组分对沉积物中水合物相平衡关系影响以及HBS相平衡研究中有关制样方法技术、各组分含量测试以及相平衡关系理论模型研究方面的国内外研究现状。研究成果表明,HBS的沉积物物性、孔隙水盐度和气体组分均对天然气水合物相平衡关系具有显著影响,试验研究中应用了很多先进方法技术,但仍然存在定量精度较低或实施成本较高等问题;基于微观尺度建立的有关HBS的相平衡宏观模型能较好地模拟与预测HBS的相平衡关系,但其表达式复杂、参数较多和不易获得制约了其在天然气水合物开采中的有关岩土力学与工程理论研究和工程实践中应用。
Natural gas hydrate is one of the most important potential energy sources, at the same time which is the triggering factor of global climate change and geologic hazards. The phase equilibrium of hydrates bearing sediments （HBS） is a basic issue for resources evaluation ,exploitation and effection on environments. There is larger differece on association and dissociation of gas hydrate in pure water and sediments. By summarizing the research information both indoor and outdoor and based on the inverstigation needs of geotachnic engineering in the exploration and utilization of natural gas hydrates, the state of art on the effection of HBS formation mode, character of sediments, salinity of pore water and components of gases on the phase equilibrium of HBS, some techniques and methods for making samples, determination of composition content and the theoretical model is presented. Results show that formation mode, property of sediments, salinity of pore water and component of gases effect on phase equilibrium remarkably. There is poor precision in quantitative analysis or expensive costs in the numerous advanced methods and equips used in experiments and tests about HBS. The micro-theoretic models of phase equilibrium of HBS could model the phase equilibrium very well; however, complexity in expression and acquire hardly is the limitation of its application about geotechnical engineering problem in the exploitation of hydrate.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2011年第8期2287-2294,2306,共9页
Rock and Soil Mechanics
基金
中国科学院知识创新工程重要方向项目(No.KZCX2-YW-JS108)
中科院"百人计划"择优支持项目
岩土力学与工程国家重点实验室前沿领域探索性项目(No.SKLQ014)
关键词
含天然气水合物沉积物
相平衡关系
沉积物物性
孔隙水盐度
气体组分
natural gas hydrates in bearing sediments
phase equilibrium
property of sediments
salinity of pore water
componentof gases
